ID   PORTL_BPT3              Reviewed;         535 AA.
AC   P20323;
DT   01-FEB-1991, integrated into UniProtKB/Swiss-Prot.
DT   01-FEB-1991, sequence version 1.
DT   07-OCT-2020, entry version 62.
DE   RecName: Full=Portal protein {ECO:0000255|HAMAP-Rule:MF_04120};
DE   AltName: Full=Gene product 8;
DE            Short=Gp8;
DE   AltName: Full=Head-to-tail connector {ECO:0000255|HAMAP-Rule:MF_04120};
GN   Name=8;
OS   Enterobacteria phage T3 (Bacteriophage T3).
OC   Viruses; Duplodnaviria; Heunggongvirae; Uroviricota; Caudoviricetes;
OC   Caudovirales; Autographiviridae; Studiervirinae; Teetrevirus;
OC   Escherichia virus T3.
OX   NCBI_TaxID=10759;
OH   NCBI_TaxID=562; Escherichia coli.
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RC   STRAIN=Luria;
RX   PubMed=2614843; DOI=10.1016/0022-2836(89)90102-2;
RA   Beck P.J., Gonzalez S., Ward C.L., Molineux I.J.;
RT   "Sequence of bacteriophage T3 DNA from gene 2.5 through gene 9.";
RL   J. Mol. Biol. 210:687-701(1989).
CC   -!- FUNCTION: Forms the portal vertex of the capsid. This portal plays
CC       critical roles in head assembly, genome packaging, neck/tail
CC       attachment, and genome ejection. The portal protein multimerizes as a
CC       single ring-shaped homododecamer arranged around a central channel.
CC       {ECO:0000255|HAMAP-Rule:MF_04120}.
CC   -!- SUBUNIT: Homododecamer. Interacts with major capsid protein. Interacts
CC       with the tail tube proteins gp11 and gp12. Interacts with the terminase
CC       large subunit. Interacts with the internal virion protein gp14.
CC       {ECO:0000255|HAMAP-Rule:MF_04120}.
CC   -!- SUBCELLULAR LOCATION: Virion {ECO:0000255|HAMAP-Rule:MF_04120}.
CC   -!- SIMILARITY: Belongs to the podoviridae portal protein family.
CC       {ECO:0000255|HAMAP-Rule:MF_04120}.
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DR   EMBL; X17255; CAA35152.1; -; Genomic_DNA.
DR   PIR; S07521; S07521.
DR   RefSeq; NP_523332.1; NC_003298.1.
DR   SMR; P20323; -.
DR   PRIDE; P20323; -.
DR   GeneID; 927409; -.
DR   KEGG; vg:927409; -.
DR   GO; GO:0046798; C:viral portal complex; IEA:UniProtKB-UniRule.
DR   GO; GO:0019073; P:viral DNA genome packaging; IEA:UniProtKB-UniRule.
DR   GO; GO:0099002; P:viral genome ejection through host cell envelope, short tail mechanism; IEA:UniProtKB-UniRule.
DR   HAMAP; MF_04120; PORTAL_PROTEIN_T7; 1.
DR   InterPro; IPR020991; Connector_podovirus.
DR   InterPro; IPR038995; Portal_prot_Caudovirale.
DR   Pfam; PF12236; Head-tail_con; 1.
PE   3: Inferred from homology;
KW   Capsid protein; Viral capsid assembly;
KW   Viral genome ejection through host cell envelope; Viral genome packaging;
KW   Viral penetration into host cytoplasm; Viral release from host cell;
KW   Viral short tail ejection system; Virion; Virus entry into host cell.
FT   CHAIN           1..535
FT                   /note="Portal protein"
FT                   /id="PRO_0000106516"
SQ   SEQUENCE   535 AA;  58620 MW;  1791F9551535535C CRC64;
     MADSKRTGLG EDGAKATYDR LTNDRRAYET RAENCAQYTI PSLFPKESDN ESTDYTTPWQ
     AVGARGLNNL ASKLMLALFP MQSWMKLTIS EYEAKQLVGD PDGLAKVDEG LSMVERIIMN
     YIESNSYRVT LFECLKQLIV AGNALLYLPE PEGSYNPMKL YRLSSYVVQR DAYGNVLQIV
     TRDQIAFGAL PEDVRSAVEK SGGEKKMDEM VDVYTHVYLD EESGDYLKYE EVEDVEIDGS
     DATYPTDAMP YIPVRMVRID GESYGRSYCE EYLGDLRSLE NLQEAIVKMS MISAKVIGLV
     NPAGITQPRR LTKAQTGDFV PGRREDIDFL QLEKQADFTV AKAVSDQIEA RLSYAFMLNS
     AVQRTGERVT AEEIRYVASE LEDTLGGVYS ILSQELQLPL VRVLLKQLQA TSQIPELPKE
     AVEPTISTGL EAIGRGQDLD KLERCISAWA ALAPMQGDPD INLAVIKLRI ANAIGIDTSG
     ILLTDEQKQA LMMQDAAQTG VENAAAAGGA GVGALATSSP EAMQGAAAKA GLNAT