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- **********************************
- * Signal peptidases II signature *
- **********************************
-
- Signal peptidases (SPases) [1] (also known as leader peptidases) remove the
- signal peptides from secretory proteins. In prokaryotes three types of SPases
- are known: type I (gene lepB) which is responsible for the processing of the
- majority of exported pre-proteins; type II (gene lsp) which only process
- lipoproteins, and a third type involved in the processing of pili subunits.
-
- SPase II (EC 3.4.99.35), also known as lipoprotein signal peptidase,
- recognizes a conserved sequence and cuts in front of a cysteine residue to
- which a glyceride-fatty acid lipid is attached. SPase II is an integral
- membrane protein that is anchored in the cytoplasmic membrane.
-
- There are a number of conserved regions in the sequence of Spase II from
- various bacteria [2], we have selected one of these regions as a signature
- pattern.
-
- -Consensus pattern: G-A-L-G-N-[LIVMFY](2)-D-R
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Other sequence(s) detected in SWISS-PROT: NONE.
-
- -Expert(s) to contact by email: von Heijne G.
- gvh@csb.ki.se
-
- -Last update: October 1993 / First entry.
-
- [ 1] Dalbey R.E., von Heijne G.
- Trends Biochem. Sci. 17:474-478(1992).
- [ 2] Zhao X.J., Wu H.C.
- FEBS Lett. 299:80-84(1992).
-