ID   U1_BPP1                 Reviewed;         175 AA.
AC   Q71TD6;
DT   29-APR-2015, integrated into UniProtKB/Swiss-Prot.
DT   05-JUL-2004, sequence version 1.
DT   03-AUG-2022, entry version 54.
DE   RecName: Full=Tail fiber assembly protein U;
DE   AltName: Full=Gene product U;
DE            Short=gpU;
GN   Name=U;
OS   Escherichia phage P1 (Bacteriophage P1).
OC   Viruses; Duplodnaviria; Heunggongvirae; Uroviricota; Caudoviricetes;
OC   Caudovirales; Myoviridae; Punavirus.
OX   NCBI_TaxID=2886926;
OH   NCBI_TaxID=543; Enterobacteriaceae.
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RC   STRAIN=Mod1902::IS5 c1.100 rev dmt, and Mod749::IS5 c1.100 mutant;
RX   PubMed=15489417; DOI=10.1128/jb.186.21.7032-7068.2004;
RA   Lobocka M.B., Rose D.J., Plunkett G. III, Rusin M., Samojedny A.,
RA   Lehnherr H., Yarmolinsky M.B., Blattner F.R.;
RT   "Genome of bacteriophage P1.";
RL   J. Bacteriol. 186:7032-7068(2004).
RN   [2]
RP   FUNCTION, AND INDUCTION.
RX   PubMed=6327269; DOI=10.1002/j.1460-2075.1982.tb01336.x;
RA   Iida S., Meyer J., Kennedy K.E., Arber W.;
RT   "A site-specific, conservative recombination system carried by
RT   bacteriophage P1. Mapping the recombinase gene cin and the cross-over sites
RT   cix for the inversion of the C segment.";
RL   EMBO J. 1:1445-1453(1982).
CC   -!- FUNCTION: Chaperone involved in tail fiber assembly. Expressed
CC       alternatively with tail fiber assembly protein U'. Remains associated
CC       to the tail fiber and participates in the host receptor binding. Two
CC       alternate tail fiber assembly proteins U and U' are encoded extending
CC       the host range of the virus. {ECO:0000250|UniProtKB:Q9T1U9,
CC       ECO:0000305|PubMed:6327269}.
CC   -!- SUBCELLULAR LOCATION: Virion. Host cytoplasm. Note=Tail fiber.
CC       {ECO:0000250|UniProtKB:Q9T1U9}.
CC   -!- INDUCTION: Expressed alternatively with tail fiber assembly protein U'.
CC       The switch from S-U to S'-U' is performed through inversion of a DNA
CC       segment called C by the phage invertase protein Cin.
CC       {ECO:0000250|UniProtKB:Q9T1U9, ECO:0000305|PubMed:6327269}.
CC   -!- SIMILARITY: Belongs to the tfa family. {ECO:0000305}.
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DR   EMBL; AF234172; AAQ14005.1; -; Genomic_DNA.
DR   EMBL; AF234173; AAQ14113.1; -; Genomic_DNA.
DR   RefSeq; YP_006501.1; NC_005856.1.
DR   SMR; Q71TD6; -.
DR   GeneID; 2777436; -.
DR   KEGG; vg:2777436; -.
DR   Proteomes; UP000001577; Genome.
DR   Proteomes; UP000008091; Genome.
DR   GO; GO:0030430; C:host cell cytoplasm; IEA:UniProtKB-SubCell.
DR   GO; GO:0046718; P:viral entry into host cell; IEA:UniProtKB-KW.
DR   GO; GO:0098678; P:viral tropism switching; IEA:UniProtKB-KW.
DR   GO; GO:0019062; P:virion attachment to host cell; IEA:UniProtKB-KW.
DR   GO; GO:0098004; P:virus tail fiber assembly; IEA:UniProtKB-KW.
DR   InterPro; IPR003458; Phage_T4_Gp38_tail_assem.
DR   Pfam; PF02413; Caudo_TAP; 1.
PE   2: Evidence at transcript level;
KW   Chaperone; Host cytoplasm; Host-virus interaction; Late protein;
KW   Reference proteome; Viral attachment to host cell;
KW   Viral receptor tropism switching; Viral release from host cell;
KW   Viral tail assembly; Viral tail fiber assembly; Virion;
KW   Virus entry into host cell.
FT   CHAIN           1..175
FT                   /note="Tail fiber assembly protein U"
FT                   /id="PRO_0000432952"
SQ   SEQUENCE   175 AA;  20259 MW;  8567398DDD10D9FA CRC64;
     MQHLKNIRSG NPKTKEQYQL TKNFDVIWLW SEDGKNWYEE VKNFQPDTIK IVYDENNIIV
     AITKDASTLN PEGFSVVEVP DITANRRADD SGKWMFKDGA VVKRIYTADE QQQQAESQKA
     ALLSEAESVI QPLERAVRLN MATDEERTRL EAWERYSVLV SRVDTANPEW PQKPE