ID   IPI2_BPT4               Reviewed;         100 AA.
AC   P03719;
DT   21-JUL-1986, integrated into UniProtKB/Swiss-Prot.
DT   01-JAN-1990, sequence version 2.
DT   23-FEB-2022, entry version 69.
DE   RecName: Full=Internal protein II;
DE            Short=IpII;
DE   Flags: Precursor;
GN   Name=ipi2;
OS   Enterobacteria phage T4 (Bacteriophage T4).
OC   Viruses; Duplodnaviria; Heunggongvirae; Uroviricota; Caudoviricetes;
OC   Caudovirales; Myoviridae; Tevenvirinae; Tequatrovirus.
OX   NCBI_TaxID=10665;
OH   NCBI_TaxID=562; Escherichia coli.
RN   [1]
RP   PROTEIN SEQUENCE.
RX   PubMed=1271467; DOI=10.1016/s0022-2836(76)80059-9;
RA   Isobe T., Black L.W., Tsugita A.;
RT   "Primary structure of bacteriophage T4 internal protein II and
RT   characterization of the cleavage upon phage maturation.";
RL   J. Mol. Biol. 102:349-365(1976).
RN   [2]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RX   PubMed=3024113; DOI=10.1093/nar/14.21.8637;
RA   Valerie K., Stevens J., Lynch M., Henderson E.E., de Riel J.K.;
RT   "Nucleotide sequence and analysis of the 58.3 to 65.5-kb early region of
RT   bacteriophage T4.";
RL   Nucleic Acids Res. 14:8637-8654(1986).
RN   [3]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RX   PubMed=12626685; DOI=10.1128/mmbr.67.1.86-156.2003;
RA   Miller E.S., Kutter E., Mosig G., Arisaka F., Kunisawa T., Ruger W.;
RT   "Bacteriophage T4 genome.";
RL   Microbiol. Mol. Biol. Rev. 67:86-156(2003).
CC   -!- FUNCTION: Internal protein II, which has a histone-like character,
CC       binds weakly to other components of the assembly core during an early
CC       stage of bacteriophage head morphogenesis.
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DR   EMBL; X04567; CAA28214.1; -; Genomic_DNA.
DR   EMBL; AF158101; AAD42586.1; -; Genomic_DNA.
DR   PIR; B36780; HIBP24.
DR   RefSeq; NP_049734.1; NC_000866.4.
DR   SMR; P03719; -.
DR   GeneID; 1258729; -.
DR   KEGG; vg:1258729; -.
DR   Proteomes; UP000009087; Genome.
PE   1: Evidence at protein level;
KW   Direct protein sequencing; Reference proteome.
FT   PROPEP          1..10
FT                   /id="PRO_0000003340"
FT   CHAIN           11..100
FT                   /note="Internal protein II"
FT                   /id="PRO_0000003341"
FT   SITE            10..11
FT                   /note="Cleavage; by prohead core protease GP21"
FT                   /evidence="ECO:0000269|PubMed:3024113"
FT   CONFLICT        1
FT                   /note="M -> ZPALKM (in Ref. 1; AA sequence)"
FT                   /evidence="ECO:0000305"
FT   CONFLICT        39
FT                   /note="K -> KK (in Ref. 1; AA sequence)"
FT                   /evidence="ECO:0000305"
FT   CONFLICT        63..64
FT                   /note="KP -> PK (in Ref. 1; AA sequence)"
FT                   /evidence="ECO:0000305"
FT   CONFLICT        73..74
FT                   /note="DN -> ND (in Ref. 1; AA sequence)"
FT                   /evidence="ECO:0000305"
FT   CONFLICT        84
FT                   /note="D -> N (in Ref. 1; AA sequence)"
FT                   /evidence="ECO:0000305"
FT   CONFLICT        89..92
FT                   /note="AAIE -> IEAA (in Ref. 1; AA sequence)"
FT                   /evidence="ECO:0000305"
SQ   SEQUENCE   100 AA;  11086 MW;  3324743804CEA654 CRC64;
     MKTYQEFIAE ARVGAGKLEA AVNKKAHSFH DLPDKDRKKL VSLYIDRERI LALPGANEGK
     QAKPLNAVEK KIDNFASKFG MSMDDLQQAA IEAAKAIKDK