ID   PORTL_BPB03             Reviewed;         308 AA.
AC   Q37891;
DT   15-DEC-1998, integrated into UniProtKB/Swiss-Prot.
DT   01-NOV-1996, sequence version 1.
DT   29-SEP-2021, entry version 79.
DE   RecName: Full=Portal protein;
DE   AltName: Full=Gene product 10;
DE            Short=gp10;
DE   AltName: Full=Head-to-tail connector;
DE   AltName: Full=Upper collar protein;
GN   Name=10;
OS   Bacillus phage B103 (Bacteriophage B103).
OC   Viruses; Duplodnaviria; Heunggongvirae; Uroviricota; Caudoviricetes;
OC   Caudovirales; Salasmaviridae; Picovirinae; Beecentumtrevirus.
OX   NCBI_TaxID=10778;
OH   NCBI_TaxID=1423; Bacillus subtilis.
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RX   PubMed=9358052; DOI=10.1016/s0378-1119(97)00363-6;
RA   Pecenkova T., Benes V., Paces J., Vlcek C., Paces V.;
RT   "Bacteriophage B103: complete DNA sequence of its genome and relationship
RT   to other Bacillus phages.";
RL   Gene 199:157-163(1997).
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       Binds to the packaging RNA (pRNA) and ATPase gp16 motor.
CC       {ECO:0000250|UniProtKB:P04332}.
CC   -!- SUBUNIT: Homododecamer. {ECO:0000250|UniProtKB:P04332}.
CC   -!- SUBCELLULAR LOCATION: Virion {ECO:0000250|UniProtKB:P04332}.
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DR   EMBL; X99260; CAA67658.1; -; Genomic_DNA.
DR   RefSeq; NP_690644.1; NC_004165.1.
DR   SMR; Q37891; -.
DR   GeneID; 955371; -.
DR   KEGG; vg:955371; -.
DR   Proteomes; UP000000971; Genome.
DR   GO; GO:0019028; C:viral capsid; IEA:UniProtKB-KW.
DR   GO; GO:0003723; F:RNA binding; IEA:UniProtKB-KW.
DR   GO; GO:0099002; P:viral genome ejection through host cell envelope, short tail mechanism; IEA:UniProtKB-KW.
DR   InterPro; IPR008016; Gp10.
DR   InterPro; IPR036199; Gp10_sf.
DR   Pfam; PF05352; Phage_connector; 1.
DR   SUPFAM; SSF56826; SSF56826; 1.
PE   3: Inferred from homology;
KW   Capsid protein; Late protein; RNA-binding; 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..308
FT                   /note="Portal protein"
FT                   /id="PRO_0000106585"
SQ   SEQUENCE   308 AA;  35426 MW;  E4BBB1E0B16A461A CRC64;
     MARKRNSYKS INDIQRMRGN RWYYHYYQYL CSLAYQLFEW ERLPPSVDPS YLEKSIHQFG
     YVGFYKDPRI GYIACQGALS GTVDHYNLPD RFHASSVGYQ NTFKLYNYSD MKEKNMGVAI
     YNNDLKCSTL PALEMFAQDL AELKEIIAVN QNAQKTPVLI AANDNNQLSL KNIYNQYEGN
     APVIFVHESL DLDNLKVFKT DAPYVVDKLN AQKNAVWNEV MTYLGIKNAN LEKKERMVTS
     EVDSNDEQIE SSGNIYLKAR QEACNKISEL YGLNLKVKFR YDIVEQMRLN AQGIENVSRG
     TLGGETNG