home *** CD-ROM | disk | FTP | other *** search
- ********************************************
- * Bacterial export FHIPEP family signature *
- ********************************************
-
- A number of bacterial proteins which seem to be involved in the translocation
- of specific proteins across the bacterial cell membrane by a distinct
- secretory mechanism that does not require the cleavage of a signal peptide are
- evolutionary related and belong to a family [1,2,3] that currently consist of:
-
- - flhA from Bacillus subtilis, which is involved in the export of flagellar
- proteins.
- - flbF from Caulobacter crescentus, whose exact function is not yet clear.
- - hrpI from Erwinia amylovora which is necessary for the secretion of harpin,
- a proteinaceous elecitor of the hypersensitive response (HR) in the host
- of this plant-pathogen.
- - hrpC2 from Xanthomonas campestris pv. vesicatoria, also involved in HR.
- - hrpI from Pseudomonas syringae, also involved in HR and probably in the
- secretion of harpin-Pss.
- - hrpO from Burkholderia solanacearum, also involved in HR.
- - invA from Salmonella typhimurium, which could be involved in the
- translocation of the invE protein necessary for the invasion of the cells
- of the intestinal epithelium.
- - lcrD from Yersinia enterocolitica and pestis, which could be involved in
- the secretion of the Yop virulence proteins.
- - mxiA from Shigella flexneri which is involved in the secretion of the Ipa
- invasins which are necessary for penetration of intestinal epithelial
- cells.
-
- These proteins have all about 700 amino acid residues. The N-terminal half is
- highly conserved and seems to contain 6 to 8 transmembrane domains. The C-
- terminal half is less conserved and seems to be devoid of transmembrane
- domains. It is possible that these proteins serve a pores for the export of
- specific proteins. We call this family FHIPEP, which stands for Flagella/Hr/
- Invasion Proteins Export Pore.
-
- As a signature pattern we selected the best conserved region, a highly
- conserved hydrophilic domain between two transmembranes regions.
-
- -Consensus pattern: R-[LIVM]-[GSA]-E-V-[GSA]-A-R-F-[ST]-L-D-[GSA]-M-P-G-K-Q-M-
- [GSA]-I-D-[GSA]-D
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Other sequence(s) detected in SWISS-PROT: NONE.
- -Last update: June 1994 / First entry.
-
- [ 1] Wei Z.-M., Beer S.V.
- J. Bacteriol. 175:7958-7967(1993).
- [ 2] Gough C.L., Genin S., Lopes V., Boucher C.A.
- Mol. Gen. Genet. 239:378-392(1993).
- [ 3] Carpenter P.B., Ordal G.W.
- Mol. Microbiol. 7:735-743(1993).
-