ID   SP4_XENLA               Reviewed;          79 AA.
AC   P24056; Q53X49;
DT   01-MAR-1992, integrated into UniProtKB/Swiss-Prot.
DT   23-JAN-2007, sequence version 2.
DT   03-AUG-2022, entry version 54.
DE   RecName: Full=Sperm-specific basic nuclear protein SP4;
GN   Name=sp4-a; Synonyms=sp42;
GN   and
GN   Name=sp4-b; Synonyms=sp43;
GN   and
GN   Name=sp4-c; Synonyms=sp44;
OS   Xenopus laevis (African clawed frog).
OC   Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi; Amphibia;
OC   Batrachia; Anura; Pipoidea; Pipidae; Xenopodinae; Xenopus; Xenopus.
OX   NCBI_TaxID=8355;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [MRNA], PROTEIN SEQUENCE OF 2-44 AND 65-79, AND
RP   DEVELOPMENTAL STAGE.
RC   TISSUE=Round spermatid;
RX   PubMed=2015853; DOI=10.1016/0014-4827(91)90135-h;
RA   Hiyoshi H., Uno S., Yokota T., Katagiri C., Nishida H., Takai M., Agata K.,
RA   Eguchi G., Abe S.;
RT   "Isolation of cDNA for a Xenopus sperm-specific basic nuclear protein (SP4)
RT   and evidence for expression of SP4 mRNA in primary spermatocytes.";
RL   Exp. Cell Res. 194:95-99(1991).
RN   [2]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA] (SP4-A; SP4-B AND SP4-C).
RC   STRAIN=J;
RX   PubMed=8541323; DOI=10.1016/0304-4165(95)00124-7;
RA   Mita K., Ariyoshi N., Abe S., Takamune K., Katagiri C.;
RT   "Structure of genes for sperm-specific nuclear basic protein (SP4) in
RT   Xenopus leavis.";
RL   Biochim. Biophys. Acta 1245:430-438(1995).
CC   -!- SUBCELLULAR LOCATION: Nucleus {ECO:0000305}.
CC   -!- DEVELOPMENTAL STAGE: SP4 gene is transcribed in or before primary
CC       spermatocyte stage but is translated at the round spermatid stage.
CC       {ECO:0000269|PubMed:2015853}.
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DR   EMBL; D00916; BAA00762.1; -; mRNA.
DR   EMBL; D45253; BAA08209.1; -; Genomic_DNA.
DR   EMBL; D45253; BAA08210.1; -; Genomic_DNA.
DR   EMBL; D45253; BAA08211.1; -; Genomic_DNA.
DR   PIR; JH0404; JH0404.
DR   PIR; S65036; S65036.
DR   RefSeq; NP_001081230.1; NM_001087761.2.
DR   AlphaFoldDB; P24056; -.
DR   GeneID; 397723; -.
DR   KEGG; xla:397723; -.
DR   CTD; 397723; -.
DR   Proteomes; UP000186698; Chromosome 3L.
DR   Bgee; 397723; Expressed in testis and 8 other tissues.
DR   GO; GO:0005634; C:nucleus; IEA:UniProtKB-SubCell.
PE   1: Evidence at protein level;
KW   Direct protein sequencing; Nucleus; Reference proteome; Repeat.
FT   INIT_MET        1
FT                   /note="Removed"
FT                   /evidence="ECO:0000269|PubMed:2015853"
FT   CHAIN           2..79
FT                   /note="Sperm-specific basic nuclear protein SP4"
FT                   /id="PRO_0000072076"
FT   REPEAT          45..52
FT   REPEAT          53..60
FT   REGION          1..79
FT                   /note="Disordered"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   COMPBIAS        8..56
FT                   /note="Basic residues"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   COMPBIAS        57..79
FT                   /note="Basic and acidic residues"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
SQ   SEQUENCE   79 AA;  9326 MW;  920C021D88FD70DC CRC64;
     MSKVSGGSRR TRARRPMSNR RGRRSQSAAH RSRAQRRRRR TGTTRRARTS TARRARTRTA
     RRSDLTRMMA RDYGSDYRS