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- **************************
- * Protamine P1 signature *
- **************************
-
- Protamines are small, highly basic proteins, that substitute for histones in
- sperm chromatin during the haploid phase of spermatogenesis. They pack
- sperm DNA into a highly condensed, stable and inactive complex. There are
- two different types of mammalian protamine, called P1 and P2. P1 has been
- found in all species studied, while P2 is sometimes absent. There seems to be
- a single type of avian protamine whose sequence is closely related to that of
- mammalian P1 [1].
-
- As a signature for this family of proteins, we selected a conserved region at
- the N-terminal extremity of the sequence.
-
- -Consensus pattern: [AV]-R-[NFY]-R-x(2,3)-[ST]-x-S-x-S
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Other sequence(s) detected in SWISS-PROT: NONE.
- -Last update: June 1994 / Pattern and text revised.
-
- [ 1] Oliva R., Goren R., Dixon G.H.
- J. Biol. Chem. 264:17627-17630(1989).
-