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- **********************************************************
- * Bacterial type II secretion system protein D signature *
- **********************************************************
-
- A number of bacterial proteins, some of which are involved in a general
- secretion pathway (GSP) for the export of proteins (also called the type II
- pathway) [1 to 5], have been found to be evolutionary related. These proteins
- are listed below:
-
- - The 'D' protein from the GSP operon of: Aeromonas hydrophila (gene exeD);
- Erwinia chrysanthemi and carotovora (gene outD); Klebsiella pneumoniae
- (gene pulD); Pseudomonas aeruginosa (gene xcpQ), and Xanthomonas campestris
- (gene xpsD).
- - Haemophilus influenzae orfE in a gene locus involved in transformation (DNA
- uptake).
- - pilQ from Pseudomonas aeruginosa, which is essential for the formation of
- the pili.
- - hopQ from Escherichia coli.
- - hrpH from Pseudomonas syringae, which is involved in the secretion of a
- proteinaceous elicitor of the hypersensitivity response in plants.
- - hrpA1 from Xanthomonas campestris pv. vesicatoria, which is also involved
- in the hypersensitivity response.
- - mxiD from Shigella flexneri which is involved in the secretion of the Ipa
- invasins which are necessary for penetration of intestinal epithelial
- cells.
- - omc from Neisseria gonorrhoeae.
- - yssC from Yersinia enterocolitica virulence plasmid pYV, which seems to be
- required for the export of the Yop virulence proteins.
- - The gpIV protein from filamentous phages such as f1, ike, or m13. GpIV is
- said to be involved in phage assembly and morphogenesis.
-
- These proteins all seem to start with a signal sequence and are thought to be
- integral proteins in the outer membrane. As a signature pattern we selected a
- conserved region in the C-terminal section of these proteins.
-
- -Consensus pattern: [GR]-[DEQKG]-[STV]-[LIVMA](3)-[GA]-G-[LIVMFY]-x(11)-
- [LIVM]-P-[LIVMFYWGS]-[LIVMF]-[GSAE]-x-[LIVM]-P-
- [LIVMFYW](2)-x(2)-[LV]-F
- -Sequences known to belong to this class detected by the pattern: ALL, except
- for hrpH and omc.
- -Other sequence(s) detected in SWISS-PROT: NONE.
- -Last update: June 1994 / Pattern and text revised.
-
- [ 1] Salmond G.P.C., Reeves P.J.
- Trends Biochem. Sci. 18:7-12(1993).
- [ 2] Reeves P.J., Whitcombe D., Wharam S., Gibson M., Allison G., Bunce N.,
- Barallon R., Douglas P., Mulholland V., Stevens S., Walker S.,
- Salmond G.P.C.
- Mol. Microbiol. 8:443-456(1993).
- [ 3] Martin P.R., Hobbs M., Free P.D., Jeske Y., Mattick J.S.
- Mol. Microbiol. 9:857-868(1993).
- [ 4] Hobbs M., Mattick J.S.
- Mol. Microbiol. 10:233-243(1993).
- [ 5] Genin S., Boucher C.A.
- Mol. Gen. Genet. 243:112-118(1994).
-