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- * Nuclear transition protein 2 signatures *
- ******************************************
-
- In mammals, the second stage of spermatogenesis is characterized by the
- conversion of nucleosomal chromatin to the compact, nonnucleosomal and
- transcriptionally inactive form found in the sperm nucleus. This condensation
- is associated with a double-protein transition. The first transition
- corresponds to the replacement of histones by several spermatid-specific
- proteins (also called transition proteins) which are themselves replaced by
- protamines during the second transition.
-
- Nuclear transition protein 2 (TP2) is one of these spermatid-specific
- proteins. TP2 is a basic; zinc-binding protein [1] of 116 to 137 amino-acid
- residues. Structurally, TP2, consist of three distinct parts: a conserved
- serine-rich N-terminal domain of about 25 residues; a variable central domain
- of 20 to 50 residues which contains cysteine residues; and a conserved C-
- terminal domain of about 70 residues which is rich in lysines and arginines.
-
- We have developed two signature patterns for TP2: one located in the N-
- terminal domain, the other in the C-terminal.
-
- -Consensus pattern: H-x(3)-H-S-[NS]-S-x-P-Q-S
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Other sequence(s) detected in SWISS-PROT: NONE.
-
- -Consensus pattern: K-x-R-K-x(2)-E-G-K-x(2)-K-[KR]-K
- -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] Baskaran R., Rao M.R.S.
- Biochem. Biophys. Res. Commun. 179:1491-1499(1991).
-