Name: subtyping of campylobacter jejuni ssp. doylei isolates using mass spectrometry-based phyloproteomics (mspp)
Uploaded: 2016-10-30T12:30:00.000+00:00
Duration: 9 min 43 s
Description: Watch this Scientific Journal Video about Subtyping of Campylobacter jejuni ssp. doylei Isolates Using Mass Spectrometry-based PhyloProteomics MSPP at JoVE.com

We are grateful to Hannah Kleinschmidt for excellent technical support. This paper was funded by the Open Access support program of the Deutsche Forschungsgemeinschaft and the publication fund of the Georg August Universita&#776;t Go&#776;ttingen.

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The authors have nothing to disclose.

Bir MSPP düzeni kurulması en kritik adım biyomarkır iyon kimliklerin kesin genetik belirlenmesidir. Hiç şüphesiz bir biyobelirteç tanımlamak mümkün değilse, o zaman düzeni 13 uzak tutulmalıdır. C. jejuni ssp. doylei Şema 14 farklı biyomarker iyonları içerir. Bu 5 daha C&#39;ye göre olan saptanabilir C arasında jejuni ssp. jejuni MSPP şeması 13 hayranlarıyla en önemli fark jejuni ssp....

Son on yılda, matris destekli lazer desorpsiyon iyonizasyon time-of-flight kütle spektrometresi (MALDI-TOF MS) klinik mikrobiyoloji 1, 2 mikrobiyal cins ve türlerin tanımlanması için son derece değerli standart yöntem olarak ilerlemiştir. Türlere tanımlama sağlam hücreler veya hücre lizatları küçük protein parmak izi kayıt dayanır. Rutin klinik mikrobiyoloji kullanılan bir kütle spektrometresi için tipik kütle aralığı 2-20 kDa olduğunu. Buna ek olarak, sonuçta elde edilen spektrumlar aşağıda türlere suşları ve aşağıda alttür seviye 3 ayırmak için kullanılabilir. Ilk öncü çalışmalar, Campylobacter jejuni 4 suşları özel bir alt grubunun, Clostridium difficile, 5, Salmonella enterica SSP için özel biyomarker iyonları belirledik. serovar typhimurium 6, Staphylococcus aureus 7-9 ve E12 - scherichia 10 coli. alel izoformları karşılık gelen birkaç değişken biyobelirteç kitlelerin kombinasyonu derin alttiplendirmesinde için seçenek sunar. Daha önce, başarılı bir C üzerinde kütle spektrometresi tabanlı phyloproteomics (MSPP) olarak adlandırılan anlamlı ve tekrarlanabilir phyloproteomic ilişkiler içine kitle profilleri bu varyasyonları dönüştürmek için bir yöntem uygulamaya jejuni ssp. jejuni izole koleksiyonu 13. MSPP multilokus sekansı yazarak (MLST) gibi bir DNA dizisi esas alt-tiplemesi tekniklerine kütle spektrometrik eşdeğer kullanılabilir. Campylobacter türlerinin bakteriyel gastroenterit önde gelen nedeni, dünya çapında 14, 15 vardır. Campylobacteriosis enfeksiyon sonrası sekel bir sonucu olarak, yani, Guillain Barre sendromu, reaktif artrit ve iltihaplı bağırsak hastalığı 16 ortaya çıkabilir. Enfeksiyonun başlıca kaynaklarıdırtavuk, hindi, domuz, sığır, koyun ve ördekler, süt ve yüzey suyunun 15, 17 kontamine hayvan eti. Bu nedenle, gıda güvenliği bağlamında düzenli epidemiyolojik sürveyans çalışmalara ihtiyaç vardır. MLST Campylobacter türleri 18 için moleküler yazarak &quot;altın standart&quot; dır. MLST yöntemi göre Sanger sekanslama emek yoğun, zaman alıcı ve nispeten pahalı olduğu için, MLST yazarak nispeten küçük izole kohort sınırlıdır. Bu nedenle, daha ucuz ve daha hızlı alt-tiplemesi yöntemlere ihtiyaç vardır. Bu ihtiyaç MSPP gibi kitle spektrometrik yöntemlerle bir araya olabilir. Bu yazıda Campylobacter jejuni ssp bir koleksiyon kullanarak MSPP-yazmak için ayrıntılı bir protokol sunar. Doylei izolatları ve MLST ile potansiyel karşılaştırılması.

<table><tbody><tr><td>acetonitrile</td><td>Sigma-Aldrich, Taufkirchen, Germany</td><td>34967</td><td></td></tr><tr><td>Autoflex III TOF/TOF 200 system</td><td>Bruker Daltonics, Bremen, Germany</td><td>GT02554 G201</td><td>Mass spectrometer</td></tr><tr><td>bacterial test standard BTS</td><td>Bruker Daltonics, Bremen, Germany</td><td>604537</td><td></td></tr><tr><td>BioTools 3.2 SR1</td><td>Bruker Daltonics, Bremen, Germany</td><td>263564</td><td>Software Package</td></tr><tr><td>Bruker IVD Bakterial Test Standard</td><td>Bruker Daltonics, Bremen, Germany</td><td>8290190</td><td>5 tubes</td></tr><tr><td>&lt;em&gt;Campylobacter jejuni&lt;/em&gt; subsp. &lt;em&gt;doylei&lt;/em&gt; isolate&amp;nbsp;</td><td>Belgium coordinated collection of microorganisms/Laboratory of Microbiology UGent BCCM/LMG Ghent, Belgium</td><td>LMG8843</td><td>ATCC 49349;IMVS 1141;NCTC 11951;strain 093</td></tr><tr><td>&lt;em&gt;Campylobacter jejuni&lt;/em&gt; subsp. &lt;em&gt;doylei&lt;/em&gt; isolate&amp;nbsp;</td><td>Belgium coordinated collection of microorganisms/Laboratory of Microbiology UGent BCCM/LMG Ghent, Belgium</td><td>LMG9143</td><td>Goossens Z90</td></tr><tr><td>&lt;em&gt;Campylobacter jejuni&lt;/em&gt; subsp. &lt;em&gt;doylei&lt;/em&gt; isolate&amp;nbsp;</td><td>Belgium coordinated collection of microorganisms/Laboratory of Microbiology UGent BCCM/LMG Ghent, Belgium</td><td>LMG7790</td><td>ATCC 49350;CCUG 18265;Kasper 71;LMG 8219;NCTC 11847</td></tr><tr><td>&lt;em&gt;Campylobacter jejuni&lt;/em&gt; subsp. &lt;em&gt;doylei&lt;/em&gt; isolate&amp;nbsp;</td><td>Belgium coordinated collection of microorganisms/Laboratory of Microbiology UGent BCCM/LMG Ghent, Belgium</td><td>LMG9243</td><td>Goossens N130</td></tr><tr><td>&lt;em&gt;Campylobacter jejuni&lt;/em&gt; subsp. &lt;em&gt;doylei&lt;/em&gt; isolate&amp;nbsp;</td><td>Belgium coordinated collection of microorganisms/Laboratory of Microbiology UGent BCCM/LMG Ghent, Belgium</td><td>LMG8871</td><td>NCTC A603/87</td></tr><tr><td>&lt;em&gt;Campylobacter jejuni&lt;/em&gt; subsp. &lt;em&gt;doylei&lt;/em&gt; isolate&amp;nbsp;</td><td>Belgium coordinated collection of microorganisms/Laboratory of Microbiology UGent BCCM/LMG Ghent, Belgium</td><td>LMG9255</td><td>Goossens B538</td></tr><tr><td>&lt;em&gt;Campylobacter jejuni&lt;/em&gt; subsp. &lt;em&gt;doylei&lt;/em&gt; isolate&amp;nbsp;</td><td>Belgium coordinated collection of microorganisms/Laboratory of Microbiology UGent BCCM/LMG Ghent, Belgium</td><td>LMG8870</td><td>NCTC A613/87</td></tr><tr><td>Columbia agar base&amp;nbsp;</td><td>Merck, Darmstadt, Germany</td><td>1.10455 .0500</td><td>500 g</td></tr><tr><td>Compass for FlexSeries 1.2 SR1</td><td>Bruker Daltonics, Bremen, Germany</td><td>251419</td><td>Software Package</td></tr><tr><td>defibrinated sheep blood&amp;nbsp;</td><td>Oxoid Deutschland GmbH, Wesel, Germany</td><td>SR0051</td><td></td></tr><tr><td>ethanol</td><td>Sigma-Aldrich, Taufkirchen, Germany</td><td>02854 Fluka</td><td></td></tr><tr><td>formic acid</td><td>Sigma-Aldrich, Taufkirchen, Germany</td><td>F0507</td><td></td></tr><tr><td>HCCA matrix</td><td>Bruker Daltonics, Bremen, Germany</td><td>604531</td><td></td></tr><tr><td>Kimwipes paper tissue</td><td>Kimtech Science via Sigma-Aldrich, Taufkirchen, Germany</td><td>Z188956</td><td></td></tr><tr><td>MALDI Biotyper 2.0</td><td>Bruker Daltonics, Bremen, Germany</td><td>259935</td><td>Software Package</td></tr><tr><td>Mast Cryobank vials</td><td>Mast Diagnostica, Reinfeld, Germany</td><td>CRYO/B</td><td></td></tr><tr><td>MSP 96 polished steel target</td><td>Bruker Daltonics, Bremen, Germany</td><td>224989</td><td></td></tr><tr><td>QIAamp DNA Mini Kit&amp;nbsp;</td><td>Qiagen, Hilden, Germany</td><td>51304</td><td></td></tr><tr><td>recombinant human insulin</td><td>Sigma-Aldrich, Taufkirchen, Germany</td><td>I2643</td><td></td></tr><tr><td>trifluoroacetic acid</td><td>Sigma-Aldrich, Taufkirchen, Germany</td><td>T6508</td><td></td></tr><tr><td>water, molecular biology-grade</td><td>Sigma-Aldrich, Taufkirchen, Germany</td><td>W4502</td><td></td></tr></tbody></table>

subtyping of campylobacter jejuni ssp. doylei isolates using mass spectrometry-based phyloproteomics (mspp)

-TOF MS tür ve alt türlerinin düzeyinde ama daha aşağıda, gerilme seviyesinde değil sadece bazı bakterileri ayırt etmek imkanı sunuyor. saptanabilir Biyomarker iyonlarının Alelık izoformları izole özgü kitle vardiya sonuçlanır. Kütle spektrometresi tabanlı phyloproteomics (MSPP) referans suşu dizisi bir genomu ile karşılaştırıldığında izole özgü kitle vardiya phyloproteomic ilişkilerin kesinti sağlayan bir düzeni kitle spektrometresi saptanabilir Biyomarker kitleleri birleştiren yeni bir tekniktir. çıkarsanan amino asit dizileri daha sonra MSPP tabanlı dendrogramlar hesaplamak için kullanılır. Burada bir Campylobacter jejuni ssp yazarak MSPP iş akışını açıklar. Yedi suşları izole koleksiyonu doylei. Yedi suşları genetik çeşitlilik ortaya insan kaynaklı ve multilokus dizisi yazarak (MLST) vardı. MSPP yazarak yeterince onların rafi yansıtan yedi farklı MSPP dizisi türlerinde sonuçlandılogenetic ilişkiler. C. jejuni ssp. MSPP Şema 2 ile 11 kDa kütle aralığı 14 farklı biyomarker iyonlarını çoğunlukla ribozomal proteinleri içerir doylei. MSPP ilke olarak, uzun bir seri dizi ile kütle spektrometrik platformlara uyarlanabilir. Bu nedenle, bu teknik zorlanma düzeyi mikrobiyal yazmak için kullanışlı bir araç olma potansiyeline sahiptir.

Daha önce, başarılı C için bir MSPP düzeni kurulmuş jejuni ssp. 13 jejuni. Burada, biz kardeş C alttür yöntemi uzatmak amaçlanmıştır jejuni ssp. doylei. Bu özel ortamda, yedi C. jejuni ssp. doylei izolatları / Laboratuvarı Mikrobiyoloji UGent BCCM / LMG Ghent, Belçika mikroorganizmaların Belçika koleksiyonundan elde edilmiştir. Bizim analizler için kullanılan tüm yedi izolatının i...

Watch this Scientific Journal Video about Subtyping of Campylobacter jejuni ssp. doylei Isolates Using Mass Spectrometry-based PhyloProteomics MSPP at JoVE.com

Subtyping of Campylobacter jejuni ssp. doylei Isolates Using Mass Spectrometry-based PhyloProteomics MSPP

Kütle spektrometresi tabanlı phyloproteomics (MSPP) Campylobacter jejuni ssp bir koleksiyon yazın kullanıldı. Doylei multilokus dizisi yazarak (MLST) kıyasla gerilme seviyesinde izole eder.

alt türlerinin<em&gt; Campylobacter jejuni</em&gt; Ssp.<em&gt; doylei</em&gt; Kütle Spektrometre tabanlı PhyloProteomics kullanma izolatlar (MSPP)

MALDI-TOF MS offers the possibility to differentiate some bacteria not only at the species and subspecies level but even below, at the strain level. ...

subtyping-campylobacter-jejuni-ssp-doylei-isolates-using-mass

Universidad San Sebastian

Research

JoVE Journal

Genetics

Subtyping of Campylobacter jejuni ssp. doylei Isolates Using Mass Spectrometry-based PhyloProteomics (MSPP)

8.5K Görüntüleme.  Universitätsmedizin Göttingen.  Kütle spektrometresi tabanlı phyloproteomics (MSPP) Campylobacter jejuni ssp bir koleksiyon yazın kullanıldı. Doylei multilokus dizisi yazarak (MLST) kıyasla gerilme seviyesinde izole eder. 

Video: Subtyping of Campylobacter jejuni ssp. doylei Isolates Using Mass Spectrometry-based PhyloProteomics MSPP

Deep Proteome Profiling by Isobaric Labeling, Extensive Liquid Chromatography, Mass Spectrometry, and Software-assisted Quantification

Many exceptional advances have been made in mass spectrometry (MS)-based proteomics, with particular technical progress in liquid chromatography (LC) coupled to tandem mass spectrometry (LC-MS/MS) and isobaric labeling multiplexing capacity. Here, we introduce a deep-proteomics profiling protocol that combines 10-plex tandem mass tag (TMT) labeling with an extensive LC/LC-MS/MS platform, and post-MS computational interference correction to accurately quantitate whole proteomes. This protocol includes the following main steps: protein extraction and digestion, TMT labeling, 2-dimensional (2D) LC, high-resolution mass spectrometry, and computational data processing. Quality control steps are included for troubleshooting and evaluating experimental variation. More than 10,000 proteins in mammalian samples can be confidently quantitated with this protocol. This protocol can also be applied to the quantitation of post translational modifications with minor changes. This multiplexed, robust method provides a powerful tool for proteomic analysis in a variety of complex samples, including cell culture, animal tissues, and human clinical specimens.

We present a protocol to accurately quantitate proteins with isobaric labelling, extensive fractionation, bioinformatics tools, and quality control steps in combination with liquid chromatography interfaced to a high-resolution mass spectrometer.

Derin Proteom izobarik etiketleme, kapsamlı sıvı Kromatografi, kütle spektrometresi ve yazılım destekli miktar tarafından profil oluşturma

Many exceptional advances have been made in mass spectrometry (MS)-based proteomics, with particular technical progress in liquid chromatography (LC) ...

Biyokimya

Identification of Antibacterial Immunity Proteins in Escherichia coli using MALDI-TOF-TOF-MS/MS and Top-Down Proteomic Analysis

This protocol identifies the immunity proteins of the bactericidal enzymes: colicin E3 and bacteriocin, produced by a pathogenic Escherichia coli strain using antibiotic induction, and identified by MALDI-TOF-TOF tandem mass spectrometry and top-down proteomic analysis with software developed in-house. The immunity protein of colicin E3 (Im3) and the immunity protein of bacteriocin (Im-Bac) were identified from prominent b- and/or y-type fragment ions generated by the polypeptide backbone cleavage (PBC) on the C-terminal side of aspartic acid, glutamic acid, and asparagine residues by the aspartic acid effect fragmentation mechanism. The software rapidly scans in silico protein sequences derived from the whole genome sequencing of the bacterial strain. The software also iteratively removes amino acid residues of a protein sequence in the event that the mature protein sequence is truncated. A single protein sequence possessed mass and fragment ions consistent with those detected for each immunity protein. The candidate sequence was then manually inspected to confirm that all detected fragment ions could be assigned. The N-terminal methionine of Im3 was post-translationally removed, whereas Im-Bac had the complete sequence. In addition, we found that only two or three non-complementary fragment ions formed by PBC are necessary to identify the correct protein sequence. Finally, a promoter (SOS box) was identified upstream of the antibacterial and immunity genes in a plasmid genome of the bacterial strain.

Identification of Antibacterial Immunity Proteins in Escherichia coli using MALDI-TOF-TOF-MS/MS and Top-Down Proteomic Analysis

Here we present a protocol for the rapid identification of proteins produced by genomically sequenced pathogenic bacteria using MALDI-TOF-TOF tandem mass spectrometry and top-down proteomic analysis with software developed in-house. Metastable protein ions fragment because of the aspartic acid effect and this specificity is exploited for protein identification.

MALDI-TOF-TOF-MS/MS ve Yukarıdan Aşağıya Proteomik Analiz kullanılarak Escherichia coli'de Antibakteriyel Bağışıklık Proteinlerinin Tanımlanması

This protocol identifies the immunity proteins of the bactericidal enzymes: colicin E3 and bacteriocin, produced by a pathogenic Escherichia coli strain ...

Kimya

Profiling of Methyltransferases and Other S-adenosyl-L-homocysteine-binding Proteins by Capture Compound Mass Spectrometry (CCMS)

There is a variety of approaches to reduce the complexity of the proteome on the basis of functional small molecule-protein interactions such as affinity chromatography 1 or Activity Based Protein Profiling 2. Trifunctional Capture Compounds (CCs, Figure 1A) 3 are the basis for a generic approach, in which the initial equilibrium-driven interaction between a small molecule probe (the selectivity function, here S-adenosyl-L-homocysteine, SAH, Figure 1A) and target proteins is irreversibly fixed upon photo-crosslinking between an independent photo-activable reactivity function (here a phenylazide) of the CC and the surface of the target proteins. The sorting function (here biotin) serves to isolate the CC - protein conjugates from complex biological mixtures with the help of a solid phase (here streptavidin magnetic beads). Two configurations of the experiments are possible: "off-bead" 4 or the presently described "on-bead" configuration (Figure 1B). The selectivity function may be virtually any small molecule of interest (substrates, inhibitors, drug molecules).
S-Adenosyl-L-methionine (SAM, Figure 1A) is probably, second to ATP, the most widely used cofactor in nature 5, 6. It is used as the major methyl group donor in all living organisms with the chemical reaction being catalyzed by SAM-dependent methyltransferases (MTases), which methylate DNA 7, RNA 8, proteins 9, or small molecules 10. Given the crucial role of methylation reactions in diverse physiological scenarios (gene regulation, epigenetics, metabolism), the profiling of MTases can be expected to become of similar importance in functional proteomics as the profiling of kinases. Analytical tools for their profiling, however, have not been available. We recently introduced a CC with SAH as selectivity group to fill this technological gap (Figure 1A).
SAH, the product of SAM after methyl transfer, is a known general MTase product inhibitor 11. For this reason and because the natural cofactor SAM is used by further enzymes transferring other parts of the cofactor or initiating radical reactions as well as because of its chemical instability 12, SAH is an ideal selectivity function for a CC to target MTases. Here, we report the utility of the SAH-CC and CCMS by profiling MTases and other SAH-binding proteins from the strain DH5&alpha; of Escherichia coli (E. coli), one of the best-characterized prokaryotes, which has served as the preferred model organism in countless biochemical, biological, and biotechnological studies. Photo-activated crosslinking enhances yield and sensitivity of the experiment, and the specificity can be readily tested for in competition experiments using an excess of free SAH.

Profiling of Methyltransferases and Other S-adenosyl-L-homocysteine-binding Proteins by Capture Compound Mass Spectrometry CCMS

Capture Compounds are trifunctional small molecules to reduce the complexity of the proteome by functional reversible small molecule-protein interaction followed by photo-crosslinking and purification. Here we use a Capture Compound with S-adenosyl-L-homocysteine-binding as selectivity function to isolate methyltransferases from an Escherichia coli whole cell lysate and identify them by MS.

Methyltransferases, profilleme ve Diğer S Adenosil- L</subYakalama Bileşik Kütle Spektrometresi (CCMS)> homosistein bağlayıcı Proteinler

There is a variety of approaches to reduce the complexity of the proteome on the basis of functional small molecule-protein interactions such as affinity ...

Biyoloji

A Streamlined Approach for Mass Spectrometry-Based Proteomics Using Selected Tissue Regions

Mass spectrometry (MS)-based proteomics enables comprehensive proteome analysis across a wide range of biological samples, including cells, tissues, and body fluids. Formalin-fixed, paraffin-embedded (FFPE) tissue sections, commonly used for long-term archiving, have emerged as valuable resources for proteomic studies. Beyond their storage benefits, researchers can isolate regions of interest (ROIs) from normal tissue regions through collaborative efforts with pathologists. Despite this potential, a streamlined approach for proteomic experiments encompassing ROI isolation, proteomic sample preparation, and MS analysis remains lacking. In this protocol, an integrated workflow that combines macrodissection of ROIs, suspension trapping-based sample preparation, and high-throughput MS analysis is presented. Through this approach, the ROIs of patients' FFPE tissues, consisting of benign serous cystic neoplasms (SCN) and precancerous intraductal papillary mucinous neoplasms (IPMN) diagnosed by pathologists, were macrodissected, collected, and analyzed, resulting in high proteome coverage. Furthermore, molecular differences between the two distinct pancreatic cystic neoplasms were successfully identified, thus demonstrating the applicability of this approach for advancing proteomic research with FFPE tissues.

Here, we establish a mass spectrometry-based proteomic method using isolated regions of interest in formalin-fixed, paraffin-embedded tissue sections. This protocol is used to analyze proteome from specific tissue areas in archived formalin-fixed, paraffin-embedded tissue sections.

Mass spectrometry (MS)-based proteomics enables comprehensive proteome analysis across a wide range of biological samples, including cells, tissues, and ...

Identification of Protein Complexes in Escherichia coli using Sequential Peptide Affinity Purification in Combination with Tandem Mass Spectrometry

Since most cellular processes are mediated by macromolecular assemblies, the systematic identification of protein-protein interactions (PPI) and the identification of the subunit composition of multi-protein complexes can provide insight into gene function and enhance understanding of biological systems1, 2. Physical interactions can be mapped with high confidence vialarge-scale isolation and characterization of endogenous protein complexes under near-physiological conditions based on affinity purification of chromosomally-tagged proteins in combination with mass spectrometry (APMS). This approach has been successfully applied in evolutionarily diverse organisms, including yeast, flies, worms, mammalian cells, and bacteria1-6. In particular, we have generated a carboxy-terminal Sequential Peptide Affinity (SPA) dual tagging system for affinity-purifying native protein complexes from cultured gram-negative Escherichia coli, using genetically-tractable host laboratory strains that are well-suited for genome-wide investigations of the fundamental biology and conserved processes of prokaryotes1, 2, 7. Our SPA-tagging system is analogous to the tandem affinity purification method developed originally for yeast8, 9, and consists of a calmodulin binding peptide (CBP) followed by the cleavage site for the highly specific tobacco etch virus (TEV) protease and three copies of the FLAG epitope (3X FLAG), allowing for two consecutive rounds of affinity enrichment. After cassette amplification, sequence-specific linear PCR products encoding the SPA-tag and a selectable marker are integrated and expressed in frame as carboxy-terminal fusions in a DY330 background that is induced to transiently express a highly efficient heterologous bacteriophage lambda recombination system10. Subsequent dual-step purification using calmodulin and anti-FLAG affinity beads enables the highly selective and efficient recovery of even low abundance protein complexes from large-scale cultures. Tandem mass spectrometry is then used to identify the stably co-purifying proteins with high sensitivity (low nanogram detection limits).
Here, we describe detailed step-by-step procedures we commonly use for systematic protein tagging, purification and mass spectrometry-based analysis of soluble protein complexes from E. coli, which can be scaled up and potentially tailored to other bacterial species, including certain opportunistic pathogens that are amenable to recombineering. The resulting physical interactions can often reveal interesting unexpected components and connections suggesting novel mechanistic links. Integration of the PPI data with alternate molecular association data such as genetic (gene-gene) interactions and genomic-context (GC) predictions can facilitate elucidation of the global molecular organization of multi-protein complexes within biological pathways. The networks generated for E. coli can be used to gain insight into the functional architecture of orthologous gene products in other microbes for which functional annotations are currently lacking.

Identification of Protein Complexes in Escherichia coli using Sequential Peptide Affinity Purification in Combination with Tandem Mass Spectrometry

Affinity purification of tagged proteins in combination with mass spectrometry (APMS) is a powerful method for the systematic mapping of protein interaction networks and for investigating the mechanistic basis of biological processes. Here, we describe an optimized sequential peptide affinity (SPA) APMS procedure developed for the bacterium Escherichia coli that can be used to isolate and characterize stable multi-protein complexes to near homogeneity even starting from low copy numbers per cell.

Protein Kompleksi belirlenmesi<em&gt; Escherichia coli</em&gt; Tandem Kütle Spektrometresi ile Kombine Sıralı Peptid Affinity Arıtma kullanarak

Since most cellular processes are mediated by macromolecular assemblies, the systematic identification of protein-protein interactions (PPI) and the ...

Label-Free Quantitative Proteomics Workflow for Discovery-Driven Host-Pathogen Interactions

The technological achievements of mass spectrometry (MS)-based quantitative proteomics opens many undiscovered avenues for analyzing an organism&#8217;s global proteome under varying conditions. This powerful strategy applied to the interactions of microbial pathogens with the desired host comprehensively characterizes both perspectives towards infection. Herein, the workflow describes label-free quantification (LFQ) of the infectome of Cryptococcus neoformans, a fungal facultative intracellular pathogen that is the causative agent of the deadly disease cryptococcosis, in the presence of immortalized macrophage cells. The protocol details the proper protein preparation techniques for both pathogen and mammalian cells within a single experiment, resulting in appropriate peptide submission for liquid-chromatography (LC)-MS/MS analysis. The high throughput generic nature of LFQ allows a wide dynamic range of protein identification and quantification, as well as transferability to any host-pathogen infection setting, maintaining extreme sensitivity. The method is optimized to catalogue extensive, unbiased protein abundance profiles of a pathogen within infection-mimicking conditions. Specifically, the method demonstrated here provides essential information on C. neoformans pathogenesis, such as protein production necessary for virulence and identifies critical host proteins responding to microbial invasion.

Here, we present a protocol to profile the interplay between host and pathogen during infection by mass spectrometry-based proteomics. This protocol uses label-free quantification to measure changes in protein abundance of both host (e.g., macrophages) and pathogen (e.g., Cryptococcus neoformans) in a single experiment.

Keşif Odaklı Konak-Patojen Etkileşimleri için Etiketsiz Nicel Proteomik İş Akışı

The technological achievements of mass spectrometry (MS)-based quantitative proteomics opens many undiscovered avenues for analyzing an organism&#8217;s ...

İmmünoloji ve Enfeksiyon

Capture Compound Mass Spectrometry - A Powerful Tool to Identify Novel c-di-GMP Effector Proteins

Considerable progress has been made during the last decade towards the identification and characterization of enzymes involved in the synthesis (diguanylate cyclases) and degradation (phosphodiesterases) of the second messenger c-di-GMP. In contrast, little information is available regarding the molecular mechanisms and cellular components through which this signaling molecule regulates a diverse range of cellular processes. Most of the known effector proteins belong to the PilZ family or are degenerated diguanylate cyclases or phosphodiesterases that have given up on catalysis and have adopted effector function. Thus, to better define the cellular c-di-GMP network in a wide range of bacteria experimental methods are required to identify and validate novel effectors for which reliable in silico predictions fail.
We have recently developed a novel Capture Compound Mass Spectrometry (CCMS) based technology as a powerful tool to biochemically identify and characterize c-di-GMP binding proteins. This technique has previously been reported to be applicable to a wide range of organisms1. Here we give a detailed description of the protocol that we utilize to probe such signaling components. As an example, we use Pseudomonas aeruginosa, an opportunistic pathogen in which c-di-GMP plays a critical role in virulence and biofilm control. CCMS identified 74% (38/51) of the known or predicted components of the c-di-GMP network. This study explains the CCMS procedure in detail, and establishes it as a powerful and versatile tool to identify novel components involved in small molecule signaling.

The ubiquitous second messenger c-di-GMP controls growth and behavior of many bacteria. We have developed a novel Capture Compound Mass Spectrometry based technology to biochemically identify and characterize c-di-GMP binding proteins in virtually any bacterial species.

Yakalama Bileşik Kütle Spektrometre - Roman c-di-GMP Efektör Proteinler tanımlamak için güçlü bir araç

Considerable progress has been made during the last decade towards the identification and characterization of enzymes involved in the synthesis ...

Use of MALDI-TOF Mass Spectrometry and a Custom Database to Characterize Bacteria Indigenous to a Unique Cave Environment (Kartchner Caverns, AZ, USA)

MALDI-TOF mass spectrometry has been shown to be a rapid and reliable tool for identification of bacteria at the genus and species, and in some cases, strain levels. Commercially available and open source software tools have been developed to facilitate identification; however, no universal/standardized data analysis pipeline has been described in the literature. Here, we provide a comprehensive and detailed demonstration of bacterial identification procedures using a MALDI-TOF mass spectrometer. Mass spectra were collected from 15 diverse bacteria isolated from Kartchner Caverns, AZ, USA, and identified by 16S rDNA sequencing. Databases were constructed in BioNumerics 7.1. Follow-up analyses of mass spectra were performed, including cluster analyses, peak matching, and statistical analyses. Identification was performed using blind-coded samples randomly selected from these 15 bacteria. Two identification methods are presented: similarity coefficient-based and biomarker-based methods. Results show that both identification methods can identify the bacteria to the species level.

Use of MALDI-TOF Mass Spectrometry and a Custom Database to Characterize Bacteria Indigenous to a Unique Cave Environment Kartchner Caverns, AZ, USA

This work details procedures for rapid identification of bacteria using MALDI-TOF MS. The identification procedures include spectrum acquisition, database construction, and follow up analyses. Two identification methods, similarity coefficient-based and biomarker-based methods, are presented.

MALDI-TOF Kütle Spektrometresi ve Özel Veritabanı kullanımı Benzersiz Mağarası Çevre (Kartchner mağaraları, AZ, ABD) Yerli Bakteriler niteleyin için

MALDI-TOF mass spectrometry has been shown to be a rapid and reliable tool for identification of bacteria at the genus and species, and in some cases, ...

<meta charset="utf8"></head><body>Galaksi Etkin Metaproteomik: Konak-Mikrobiyom Etkileşimine İlişkin Öngörüler

A Clinical Metaproteomics Workflow Implemented within Galaxy Bioinformatics Platform to Analyze Host-Microbiome Interactions Underlying Human Disease

Clinical metaproteomics reveals host-microbiome interactions underlying diseases. However, challenges to this approach exist. In particular, the characterization of microbial proteins present in low abundance relative to host proteins is difficult. Other significant challenges are attributed to using very large protein sequence databases, which impedes sensitivity and accuracy during peptide and protein identification from mass spectrometry data in addition to retrieving taxonomy and functional annotations and performing statistical analysis. To address these problems, we present an integrated bioinformatics workflow for mass spectrometry-based metaproteomics that combines custom protein sequence database generation, peptide-spectrum match generation and verification, quantification, taxonomic and functional annotations, and statistical analysis. This workflow also offers characterization of human proteins (while prioritizing microbial proteins), thus offering insights into host-microbe dynamics in disease. The tools and workflow are deployed in the Galaxy ecosystem, enabling the development, optimization, and dissemination of these computational resources. We have applied this workflow for metaproteomic analysis of numerous clinical sample types, such as nasopharyngeal swabs and bronchoalveolar lavage fluid. Here, we demonstrate its utility via the analysis of residual fluid from cervical swabs. The complete workflow and accompanying training resources are accessible on the Galaxy Training Network to equip non-experts and experienced researchers with the necessary knowledge and tools to analyze their data.

<meta charset="utf8"></head><body>İnsan Hastalığının Altında Yatan Konak-Mikrobiyom Etkileşimlerini Analiz Etmek için Galaxy Biyoinformatik Platformunda Uygulanan Bir Klinik Metaproteomik İş Akışı<

Clinical metaproteomics offers insights into the human microbiome and its contributions to disease. We harnessed the computational power of the Galaxy platform to develop a modular bioinformatics workflow that facilitates complex mass spectrometry-based metaproteomic analysis and characterization of diverse clinical sample types relevant to studies of disease.

İnsan Hastalığının Altında Yatan Konak-Mikrobiyom Etkileşimlerini Analiz Etmek için Galaxy Biyoinformatik Platformunda Uygulanan Bir Klinik Metaproteomik İş Akışı

alt türlerinin

Özet

Daha Fazla Video Keşfet

Bu videodaki bölümler

Derin Proteom izobarik etiketleme, kapsamlı sıvı Kromatografi, kütle spektrometresi ve yazılım destekli miktar tarafından profil oluşturma

MALDI-TOF-TOF-MS/MS ve Yukarıdan Aşağıya Proteomik Analiz kullanılarak Escherichia coli'de Antibakteriyel Bağışıklık Proteinlerinin Tanımlanması

Methyltransferases, profilleme ve Diğer S Adenosil-_{L homosistein bağlayıcı Proteinler}

A Streamlined Approach for Mass Spectrometry-Based Proteomics Using Selected Tissue Regions

Protein Kompleksi belirlenmesi

Keşif Odaklı Konak-Patojen Etkileşimleri için Etiketsiz Nicel Proteomik İş Akışı

Yakalama Bileşik Kütle Spektrometre - Roman c-di-GMP Efektör Proteinler tanımlamak için güçlü bir araç

MALDI-TOF Kütle Spektrometresi ve Özel Veritabanı kullanımı Benzersiz Mağarası Çevre (Kartchner mağaraları, AZ, ABD) Yerli Bakteriler niteleyin için

İnsan Hastalığının Altında Yatan Konak-Mikrobiyom Etkileşimlerini Analiz Etmek için Galaxy Biyoinformatik Platformunda Uygulanan Bir Klinik Metaproteomik İş Akışı

İnsan Hastalığının Altında Yatan Konak-Mikrobiyom Etkileşimlerini Analiz Etmek için Galaxy Biyoinformatik Platformunda Uygulanan Bir Klinik Metaproteomik İş Akışı

alt türlerinin

Özet

Daha Fazla Video Keşfet

Bu videodaki bölümler

Derin Proteom izobarik etiketleme, kapsamlı sıvı Kromatografi, kütle spektrometresi ve yazılım destekli miktar tarafından profil oluşturma

MALDI-TOF-TOF-MS/MS ve Yukarıdan Aşağıya Proteomik Analiz kullanılarak Escherichia coli'de Antibakteriyel Bağışıklık Proteinlerinin Tanımlanması

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Methyltransferases, profilleme ve Diğer S Adenosil-_{L homosistein bağlayıcı Proteinler}