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- ************************************************************
- * Extracellular proteins SCP/Tpx-1/Ag5/PR-1/Sc7 signatures *
- ************************************************************
-
- A variety of extracellular proteins from higher eukaryotes have been found to
- be evolutionary related. These proteins are:
-
- - Rodents sperm-coating glycoprotein (SCP) (also known as acidic epididymal
- glycoprotein (AEG)). This protein is thought to be involved in sperm
- maturation [1]. SCP is a protein of of about 220 residues that probably
- contains eight disulfide bonds.
- - Mammalian testis-specific protein Tpx-1 [2]. Tpx-1 is highly related to the
- SCP's.
- - Venom allergen 5 (Ag5) from vespid wasps and venom allergen 3 (Ag3) from
- fire ants. These proteins are potent allergens and are one the main cause
- of allergic reactions to stings from insects of the hymenoptera family [3].
- Ag5/3 are proteins of about 200 residues that contain four disulfide bonds.
- - Plant pathogenesis proteins of the PR-1 family [4]. These proteins are
- synthesized during pathogen infection or other stress-related responses.
- PR-1 are proteins of about 130 to 140 residues that probably contain three
- disulfide bonds.
- - Proteins Sc7 and Sc14 from the basidomycete fungus Schizophyllum commune.
- These extracellular proteins are loosely associated with the fruit bodies
- hyphal walls [5]. Sc7/14 are proteins of about 180 residues that probably
- contain two disulfide bonds.
- - Yeast hypothetical protein YKR013w.
-
- The exact function of these proteins is not yet known. As signature patterns,
- we selected two conserved regions located in the C-terminal half of all these
- proteins. The second signature contains a cysteine which, in Ag5, is known to
- be involved in a disulfide bond.
-
- -Consensus pattern: [GER]-H-[FYWH]-T-Q-[LIVM](2)-W-x(2)-[STN]
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Other sequence(s) detected in SWISS-PROT: NONE.
-
- -Consensus pattern: [LIVMFY](2)-x-C-[NQRHS]-Y-x-[PAR]-x-[GL]-N-[LIVMFYWDN]
- [C is involved in a disulfide bond]
- -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] Mizuki N., Kasahara M.
- Mol. Cell. Endocrinol. 89:25-32(1992).
- [ 2] Kasahara M., Gutknecht J., Brew K., Spurr N., Goodfellow P.N.
- Genomics 5:527-534(1989).
- [ 3] Lu G., Villalba M., Coscia M.R., Hoffman D.R., King T.P.
- J. Immunol. 150:2823-2830(1993).
- [ 4] Dixon D.C., Cutt J.R., Klessig D.F.
- EMBO J. 10:1317-1324(1991).
- [ 5] Schuren F.H.J., Asgeirsdottir S.A., Kothe E.M., Scheer J.M.J.,
- Wessels J.G.H.
- J. Gen. Microbiol. 139:2083-2090(1993).
-