ID   GP73_BPT7               Reviewed;          99 AA.
AC   P03751;
DT   21-JUL-1986, integrated into UniProtKB/Swiss-Prot.
DT   21-JUL-1986, sequence version 1.
DT   10-JUN-2026, entry version 73.
DE   RecName: Full=Protein 7.3;
DE   AltName: Full=Gene product 7.3;
DE            Short=Gp7.3;
GN   OrderedLocusNames=7.3;
OS   Escherichia phage T7 (Bacteriophage T7).
OC   Viruses; Duplodnaviria; Heunggongvirae; Uroviricota; Caudoviricetes;
OC   Autographivirales; Autotranscriptaviridae; Studiervirinae; Teseptimavirus;
OC   Teseptimavirus T7.
OX   NCBI_TaxID=10760;
OH   NCBI_TaxID=562; Escherichia coli.
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RX   PubMed=6864790; DOI=10.1016/s0022-2836(83)80282-4;
RA   Dunn J.J., Studier F.W.;
RT   "Complete nucleotide sequence of bacteriophage T7 DNA and the locations of
RT   T7 genetic elements.";
RL   J. Mol. Biol. 166:477-535(1983).
RN   [2]
RP   FUNCTION IN VIRION MATURATION, AND SUBCELLULAR LOCATION.
RX   PubMed=16054667; DOI=10.1016/j.virol.2005.06.039;
RA   Kemp P., Garcia L.R., Molineux I.J.;
RT   "Changes in bacteriophage T7 virion structure at the initiation of
RT   infection.";
RL   Virology 340:307-317(2005).
CC   -!- FUNCTION: Plays an essential role most probably in virion tail
CC       assembly. May form a scaffold around which gp11 and gp12 polymerize.
CC       Gets ejected from the infecting particle into the bacterial cell.
CC       {ECO:0000269|PubMed:16054667}.
CC   -!- SUBCELLULAR LOCATION: Virion {ECO:0000269|PubMed:16054667}.
CC       Note=Component of the tail.
CC   -!- SIMILARITY: Belongs to the T7likevirus protein 7.3 family.
CC       {ECO:0000305}.
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DR   EMBL; V01146; CAA24423.1; -; Genomic_DNA.
DR   PIR; A04376; QSBPB7.
DR   RefSeq; NP_041993.1; NC_001604.1.
DR   PDB; 9JYZ; EM; 2.70 A; 1/2/v/w/y/z=1-99.
DR   EMDB; EMD-61910; -.
DR   SMR; P03751; -.
DR   GeneID; 1261035; -.
DR   KEGG; vg:1261035; -.
DR   OrthoDB; 28431at10239; -.
DR   Proteomes; UP000000840; Segment.
DR   GO; GO:0098015; C:virus tail; IEA:UniProtKB-KW.
DR   GO; GO:0098003; P:viral tail assembly; IDA:UniProtKB.
DR   InterPro; IPR024281; Phage_T7-like_viron_assmbl.
DR   Pfam; PF11653; VirionAssem_T7; 1.
DR   PDBsum; 9JYZ; -.
PE   1: Evidence at protein level;
KW   3D-structure; Reference proteome; Viral release from host cell;
KW   Viral tail assembly; Viral tail protein; Virion.
FT   CHAIN           1..99
FT                   /note="Protein 7.3"
FT                   /id="PRO_0000106514"
FT   REGION          59..99
FT                   /note="Disordered"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   HELIX           85..89
FT                   /evidence="ECO:0007829|PDB:9JYZ"
SQ   SEQUENCE   99 AA;  10069 MW;  2B671F640FB4845D CRC64;
     MGKKVKKAVK KVTKSVKKVV KEGARPVKQV AGGLAGLAGG TGEAQMVEVP QAAAQIVDVP
     EKEVSTEDEA QTESGRKKAR AGGKKSLSVA RSSGGGINI
//