ID   PORTL_BPSP1             Reviewed;         507 AA.
AC   B6V2N4;
DT   01-APR-2015, integrated into UniProtKB/Swiss-Prot.
DT   16-DEC-2008, sequence version 1.
DT   02-JUN-2021, entry version 28.
DE   RecName: Full=Probable portal protein;
GN   Name=3.1 {ECO:0000312|EMBL:ACI90975.1};
GN   ORFNames=SPO1_74 {ECO:0000312|EMBL:ACI90975.1};
OS   Bacillus phage SP01 (Bacteriophage SP01).
OC   Viruses; Duplodnaviria; Heunggongvirae; Uroviricota; Caudoviricetes;
OC   Caudovirales; Herelleviridae; Spounavirinae; Okubovirus.
OX   NCBI_TaxID=10685 {ECO:0000312|Proteomes:UP000001590};
OH   NCBI_TaxID=1423; Bacillus subtilis.
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RX   PubMed=19285085; DOI=10.1016/j.jmb.2009.03.009;
RA   Stewart C.R., Casjens S.R., Cresawn S.G., Houtz J.M., Smith A.L.,
RA   Ford M.E., Peebles C.L., Hatfull G.F., Hendrix R.W., Huang W.M.,
RA   Pedulla M.L.;
RT   "The genome of Bacillus subtilis bacteriophage SPO1.";
RL   J. Mol. Biol. 388:48-70(2009).
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 terminase subunits to form the packaging machine.
CC       {ECO:0000250|UniProtKB:P25480}.
CC   -!- SUBUNIT: Homododecamer. {ECO:0000250|UniProtKB:P25480}.
CC   -!- SUBCELLULAR LOCATION: Virion {ECO:0000250|UniProtKB:P25480}.
CC   -!- SIMILARITY: Belongs to the phage portal family. {ECO:0000305}.
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DR   EMBL; FJ230960; ACI90975.1; -; Genomic_DNA.
DR   RefSeq; YP_002300346.1; NC_011421.1.
DR   PRIDE; B6V2N4; -.
DR   GeneID; 7009064; -.
DR   KEGG; vg:7009064; -.
DR   Proteomes; UP000001590; Genome.
DR   GO; GO:0019028; C:viral capsid; IEA:UniProtKB-KW.
DR   GO; GO:0003677; F:DNA binding; IEA:UniProtKB-KW.
DR   GO; GO:0099000; P:viral genome ejection through host cell envelope, contractile tail mechanism; IEA:UniProtKB-KW.
DR   InterPro; IPR006944; Phage/GTA_portal.
DR   Pfam; PF04860; Phage_portal; 1.
PE   3: Inferred from homology;
KW   Capsid protein; DNA-binding; Reference proteome; Viral capsid assembly;
KW   Viral contractile tail ejection system;
KW   Viral genome ejection through host cell envelope; Viral genome packaging;
KW   Viral penetration into host cytoplasm; Viral release from host cell;
KW   Virion; Virus entry into host cell.
FT   CHAIN           1..507
FT                   /note="Probable portal protein"
FT                   /id="PRO_0000432539"
FT   REGION          1..44
FT                   /note="Disordered"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   REGION          476..507
FT                   /note="Disordered"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   COMPBIAS        21..42
FT                   /note="Basic and acidic residues"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
SQ   SEQUENCE   507 AA;  57560 MW;  9431C62C965595C4 CRC64;
     MDFFESLSKA MGLKPEQKQE PQFSGDGEDT LEKSERAQEA KSIIEDPLAL NQSEGYKEKP
     QSLSFDTLRK MSVRNTVVGA IIQTRVNQIS TFSQPARYTK DGIGFEIKLR DPKATPTQEQ
     RDRALALESF IENCGYDYNP GRDNFDTLIR KIVRDTLTFD QLSFEIVEDR LGRPAELHAV
     DAATVRAAEV EVNNGEDYVH PTDIEDEDRI KWVQVVNGQI VAEFTGSQLA FGVRNPRTDL
     SIQPYGLSEL EILVKQVTSH LWAEDYNSRY FSQGGTTKGI LNMKGQNVSR TQLDAFRRQW
     TAQLAGTTGS WKTPVVSVEG LEYINVSQSN REMEYEMWMN YLINICCAVY QIDPSEVNFP
     NRGGAGGTSG GGLGDGGIED RLKNSRDKGL RPLLRFIESV INRYVIRRFS DEFTFNFVGL
     DGETERERLE ISNKQVRAFK TINEVRKEND LPPIPDGNIV LDPTYTNYIM QKMQLEQARE
     MEEQEEESSD SGIEVVPDGL DDRYNQR