ID   PRTIB_ONCMY             Reviewed;          33 AA.
AC   P02326;
DT   21-JUL-1986, integrated into UniProtKB/Swiss-Prot.
DT   21-JUL-1986, sequence version 1.
DT   25-MAY-2022, entry version 53.
DE   RecName: Full=Protamine-1B;
DE   AltName: Full=Iridine IB;
OS   Oncorhynchus mykiss (Rainbow trout) (Salmo gairdneri).
OC   Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi;
OC   Actinopterygii; Neopterygii; Teleostei; Protacanthopterygii; Salmoniformes;
OC   Salmonidae; Salmoninae; Oncorhynchus.
OX   NCBI_TaxID=8022;
RN   [1]
RP   PROTEIN SEQUENCE.
RX   PubMed=4953052; DOI=10.1111/j.1399-3011.1969.tb01646.x;
RA   Ando T., Watanabe S.;
RT   "A new method for fractionation of protamines and the amino acid sequences
RT   of salmine and three components of iridine.";
RL   Int. J. Protein Res. 1:221-224(1969).
CC   -!- FUNCTION: Protamines substitute for histones in the chromatin of sperm
CC       during the haploid phase of spermatogenesis. They compact sperm DNA
CC       into a highly condensed, stable and inactive complex.
CC   -!- SUBCELLULAR LOCATION: Nucleus. Chromosome.
CC   -!- TISSUE SPECIFICITY: Testis.
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DR   PIR; A02668; IRTR1B.
DR   AlphaFoldDB; P02326; -.
DR   GO; GO:0000786; C:nucleosome; IEA:UniProtKB-KW.
DR   GO; GO:0005634; C:nucleus; IEA:UniProtKB-SubCell.
DR   GO; GO:0003677; F:DNA binding; IEA:UniProtKB-KW.
DR   GO; GO:0030154; P:cell differentiation; IEA:UniProtKB-KW.
DR   GO; GO:0030261; P:chromosome condensation; IEA:UniProtKB-KW.
DR   GO; GO:0007283; P:spermatogenesis; IEA:UniProtKB-KW.
PE   1: Evidence at protein level;
KW   Chromosome; Developmental protein; Differentiation;
KW   Direct protein sequencing; DNA condensation; DNA-binding; Nucleosome core;
KW   Nucleus; Spermatogenesis.
FT   PEPTIDE         1..33
FT                   /note="Protamine-1B"
FT                   /id="PRO_0000044844"
FT   REGION          1..33
FT                   /note="Disordered"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
SQ   SEQUENCE   33 AA;  4420 MW;  C859FA8CD1E64A7F CRC64;
     PRRRRRRSSS RPIRRRRPRR VSRRRRRGGR RRR