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- ***********************************
- * Spermadhesins family signatures *
- ***********************************
-
- A family of mammalian sperm proteins has been recently characterized [1].
- The proteins that are currently known to belong to this family are:
-
- - Pig spermadhesins AQN-1, AQN-3 and AWN-1. These proteins are synthesized by
- the sexual accessory glands and becomes attached to the sperm surface at
- the time of ejaculation. They bind to the ZP-glycoproteins and to heparin
- and seems to inhibit serine protease inhibitors.
- - Bovine acidic seminal fluid protein (ASFP), which seems to be growth factor
- with effects on ovarian granulosa cells.
- - Pig major seminal plasma glycoprotein PSP-I.
-
- As shown in the following schematic representation these proteins, which have
- from 110 to 130 amino acid residues, contain four conserved cysteines involved
- in two disulfide bonds.
-
- +---------+ +---------+
- | | | |
- xxxxCxxxxxxxxxCxxxxxxxxxxxCxxxxxxxxxCxxxxxxxxxxxxxxxxxx
- ************ ***********
-
- 'C': conserved cysteine involved in a disulfide bond.
- '*': position of the patterns.
-
- -Consensus pattern: C-G-G-x-L-x(4)-G-x(11)-C-[LIVM]-W-T
- [The two C's are 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.
-
- -Consensus pattern: C-x-K-E-x-[LIVM]-E-[LIVM]-x-[DE]-x(3)-G-x(5)-K-x-C
- [The two C's are 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] Calvete J.J., Solis D., Sanz L., Diaz-Maurino T., Schaefer W.,
- Mann K., Toepfer-Petersen E.
- Eur. J. Biochem. 218:719-725(1993).
-