ID   TERS_BP234              Reviewed;         171 AA.
AC   A7XXB6;
DT   08-MAY-2019, integrated into UniProtKB/Swiss-Prot.
DT   23-OCT-2007, sequence version 1.
DT   12-AUG-2020, entry version 29.
DE   RecName: Full=Terminase, small subunit {ECO:0000250|UniProtKB:A0A1L4BKP6};
DE   AltName: Full=DNA-packaging protein gp84 {ECO:0000305};
DE   AltName: Full=Gene product 84 {ECO:0000305};
DE            Short=gp84 {ECO:0000305};
GN   ORFNames=P23p84 {ECO:0000303|PubMed:18355836};
OS   Thermus virus P23-45 (Thermus thermophilus phage P23-45).
OC   Viruses; Duplodnaviria; Heunggongvirae; Uroviricota; Caudoviricetes;
OC   Caudovirales; Siphoviridae; Oshimavirus.
OX   NCBI_TaxID=466051;
OH   NCBI_TaxID=274; Thermus thermophilus.
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RX   PubMed=18355836; DOI=10.1016/j.jmb.2008.02.018;
RA   Minakhin L., Goel M., Berdygulova Z., Ramanculov E., Florens L., Glazko G.,
RA   Karamychev V.N., Slesarev A.I., Kozyavkin S.A., Khromov I., Ackermann H.W.,
RA   Washburn M., Mushegian A., Severinov K.;
RT   "Genome comparison and proteomic characterization of Thermus thermophilus
RT   bacteriophages P23-45 and P74-26: siphoviruses with triplex-forming
RT   sequences and the longest known tails.";
RL   J. Mol. Biol. 378:468-480(2008).
CC   -!- FUNCTION: The terminase small subunit binds to the packaging initiation
CC       site and regulates the ATPase activity of the terminase large subunit
CC       (By similarity). The terminase lies at a unique vertex of the procapsid
CC       and is composed of two subunits, a small terminase subunit involved in
CC       viral DNA recognition (packaging sequence), and a large terminase
CC       subunit (By similarity). Both terminase subunits heterooligomerize and
CC       are docked on the portal protein to form the packaging machine (By
CC       similarity). {ECO:0000250|UniProtKB:P04893}.
CC   -!- SUBUNIT: Homononamer; forms a ring-like structure through which genomic
CC       DNA is translocated into the capsid (By similarity). Heterodimer with
CC       the terminase large subunit; the active complex is probably
CC       heterooligomeric (By similarity). {ECO:0000250|UniProtKB:A0A1L4BKP6,
CC       ECO:0000250|UniProtKB:P04893}.
CC   -!- SIMILARITY: Belongs to the P23virus small terminase family.
CC       {ECO:0000305}.
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DR   EMBL; EU100883; ABU96917.1; -; Genomic_DNA.
DR   RefSeq; YP_001467937.1; NC_009803.1.
DR   SMR; A7XXB6; -.
DR   GeneID; 5600459; -.
DR   KEGG; vg:5600459; -.
DR   Proteomes; UP000001132; Genome.
DR   GO; GO:0003677; F:DNA binding; IEA:UniProtKB-KW.
PE   3: Inferred from homology;
KW   DNA-binding; Reference proteome; Viral genome packaging;
KW   Viral release from host cell.
FT   CHAIN           1..171
FT                   /note="Terminase, small subunit"
FT                   /id="PRO_0000447196"
SQ   SEQUENCE   171 AA;  18835 MW;  C9861E01BEC81F9A CRC64;
     MSVSFRDRVL KLYLLGFDPS EIAQTLSLDA KRKVTEEEVL HVLAEARELL SALPSLEDIR
     AEVGQALERA RIFQKDLLAI YQNMLRNYNA MMEGLTEHPD GTPVIGVRPA DIAAMADRIM
     KIDQERITAL LNSLKVLGHV GSTTAGALPS ATELVRVEEL VAEVVDEAPK T