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- ********************************************
- * HlyD family secretion proteins signature *
- ********************************************
-
- Gram-negative bacteria produce a number of proteins which are secreted into
- the growth medium by a mechanism that does not require a cleaved N-terminal
- signal sequence. These proteins, while having different functions, require the
- help of two or more proteins for their secretion across the cell envelope.
- Amongst which a protein belonging to the ABC transporters family (see the
- relevant section) and a protein belonging to a family which is currently
- composed [1 to 5] of the following members:
-
- Gene Species Protein which is exported
- ---- ---------------------- --------------------------------------------
- hlyD Escherichia coli Hemolysin
- appD A.pleuropneumoniae Hemolysin
- lcnD Lactococcus lactis Lactococcin A
- lktD A.actinomycetemcomitans Leukotoxin
- Pasteurella haemolytica
- cyaD Bordetella pertussis Calmodulin-sensitive adenylate cyclase-
- hemolysin (cyclolysin)
- cvaA Escherichia coli Colicin V
- prtE Erwinia chrysanthemi Extracellular proteases B and C
- aprE Pseudomonas aeruginosa Alkaline protease
- emrA Escherichia coli Drugs and toxins
-
- These proteins are evolutionary related and consist of from 390 to 480 amino
- acid residues. Their exact role in the secretion process is not yet known.
-
- The C-terminal section of these proteins is the best conserved region; we have
- derived a signature pattern from that region.
-
- -Consensus pattern: [LIVM]-x(2)-G-[LM]-x(3)-[STGAV]-x-[LIVMT]-x-[LIVMT]-[GE]-
- x-[KR]-x-[LIVMFYW](2)-x-[LIVMFYW](3)
- -Sequences known to belong to this class detected by the pattern: ALL, except
- for emrA.
- -Other sequence(s) detected in SWISS-PROT: NONE.
- -Last update: June 1994 / Text revised.
-
- [ 1] Gilson L., Mahanty H.K., Kolter R.
- EMBO J. 9:3875-3884(1990).
- [ 2] Letoffe S., Delepelaire P., Wandersman C.
- EMBO J. 9:1375-1382(1990).
- [ 3] Stoddard G.W., Petzel J.P., van Belkum M.J., Kok J., McKay L.L.
- Appl. Environ. Microbiol. 58:1952-1961(1992).
- [ 4] Duong F., Lazdunski A., Cami B., Murgier M.
- Gene 121:47-54(1992).
- [ 5] Lewis K.
- Trends Biochem. Sci. 19:119-123(1994).
-