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PMID:21385872
| Citation |
Sikora, AE, Zielke, RA, Lawrence, DA, Andrews, PC and Sandkvist, M (2011) Proteomic analysis of the Vibrio cholerae type II secretome reveals new proteins, including three related serine proteases. J. Biol. Chem. 286:16555-66 |
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| Abstract |
The type II secretion (T2S) system is responsible for extracellular secretion of a broad range of proteins, including toxins and degradative enzymes that play important roles in the pathogenesis and life cycle of many gram-negative bacteria. In Vibrio cholerae, the etiological agent of cholera, the T2S machinery transports cholera toxin, which induces profuse watery diarrhea, a hallmark of this life-threatening disease. Besides cholera toxin, four other proteins have been shown to be transported by the T2S machinery, including hemagglutinin protease, chitinase, GbpA, and lipase. Here, for the first time, we have applied proteomic approaches, including isotope tagging for relative and absolute quantification coupled with multidimensional liquid chromatography and tandem mass spectrometry, to perform an unbiased and comprehensive analysis of proteins secreted by the T2S apparatus of the V. cholerae El Tor strain N16961 under standard laboratory growth conditions. This analysis identified 16 new putative T2S substrates, including sialidase, several proteins participating in chitin utilization, two aminopeptidases, TagA-related protein, cytolysin, RbmC, three hypothetical proteins encoded by VCA0583, VCA0738, and VC2298, and three serine proteases VesA, VesB, and VesC. Focusing on the initial characterization of VesA, VesB, and VesC, we have confirmed enzymatic activities and T2S-dependent transport for each of these proteases. In addition, analysis of single, double, and triple protease knock-out strains indicated that VesA is the primary protease responsible for processing the A subunit of cholera toxin during in vitro growth of the V. cholerae strain N16961. |
| Links |
PubMed PMC3089498 Online version:10.1074/jbc.M110.211078 |
| Keywords |
Animals; Bacterial Proteins/metabolism; Chromatography, Liquid/methods; Cloning, Molecular; Electrophoresis, Polyacrylamide Gel; Gene Deletion; Genetic Techniques; Mass Spectrometry/methods; Mice; Protein Structure, Tertiary; Proteome; Proteomics/methods; Serine Proteases/chemistry; Tandem Mass Spectrometry/methods; Vibrio cholerae/metabolism |
| edit table |
Significance
Annotations
| Gene product | Qualifier | GO Term | Evidence Code | with/from | Aspect | Extension | Notes | Status |
|---|---|---|---|---|---|---|---|---|
| GO:0008236: serine-type peptidase activity |
ECO:0000315: |
F |
Figure 2B shows that VesC participates in hydrolysis of peptide bonds-i.e. peptidase activity.In addition overexpression of VesC resulted in an increase in enzymatic activity (Fig 3C). Figure 3C shows that the serine protease inhibitor AEBSF and the serine/cysteine protease inhibitor significantly inhibited the VesC protein. |
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See also
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