DPO3B_STAAW
ID DPO3B_STAAW Reviewed; 377 AA.
AC P0A023; P50029;
DT 01-MAR-2005, integrated into UniProtKB/Swiss-Prot.
DT 01-MAR-2005, sequence version 1.
DT 25-MAY-2022, entry version 91.
DE RecName: Full=Beta sliding clamp;
DE Short=Beta clamp;
DE Short=Sliding clamp;
DE AltName: Full=Beta-clamp processivity factor;
DE AltName: Full=DNA polymerase III beta sliding clamp subunit;
DE AltName: Full=DNA polymerase III subunit beta;
GN Name=dnaN; OrderedLocusNames=MW0002;
OS Staphylococcus aureus (strain MW2).
OC Bacteria; Firmicutes; Bacilli; Bacillales; Staphylococcaceae;
OC Staphylococcus.
OX NCBI_TaxID=196620;
RN [1]
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=MW2;
RX PubMed=12044378; DOI=10.1016/s0140-6736(02)08713-5;
RA Baba T., Takeuchi F., Kuroda M., Yuzawa H., Aoki K., Oguchi A., Nagai Y.,
RA Iwama N., Asano K., Naimi T., Kuroda H., Cui L., Yamamoto K., Hiramatsu K.;
RT "Genome and virulence determinants of high virulence community-acquired
RT MRSA.";
RL Lancet 359:1819-1827(2002).
CC -!- FUNCTION: Confers DNA tethering and processivity to DNA polymerases and
CC other proteins. Acts as a clamp, forming a ring around DNA (a reaction
CC catalyzed by the clamp-loading complex) which diffuses in an ATP-
CC independent manner freely and bidirectionally along dsDNA. Initially
CC characterized for its ability to contact the catalytic subunit of DNA
CC polymerase III (Pol III), a complex, multichain enzyme responsible for
CC most of the replicative synthesis in bacteria; Pol III exhibits 3'-5'
CC exonuclease proofreading activity. The beta chain is required for
CC initiation of replication as well as for processivity of DNA
CC replication. {ECO:0000250|UniProtKB:P0A988}.
CC -!- SUBUNIT: Forms a ring-shaped head-to-tail homodimer around DNA which
CC binds and tethers DNA polymerases and other proteins to the DNA. The
CC DNA replisome complex has a single clamp-loading complex (3 tau and 1
CC each of delta, delta', psi and chi subunits) which binds 3 Pol III
CC cores (1 core on the leading strand and 2 on the lagging strand) each
CC with a beta sliding clamp dimer. Additional proteins in the replisome
CC are other copies of gamma, psi and chi, Ssb, DNA helicase and RNA
CC primase. {ECO:0000250|UniProtKB:P0A988}.
CC -!- SUBCELLULAR LOCATION: Cytoplasm {ECO:0000250|UniProtKB:P0A988}.
CC -!- SIMILARITY: Belongs to the beta sliding clamp family. {ECO:0000305}.
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DR EMBL; BA000033; BAB93867.1; -; Genomic_DNA.
DR RefSeq; WP_000969811.1; NC_003923.1.
DR AlphaFoldDB; P0A023; -.
DR SMR; P0A023; -.
DR EnsemblBacteria; BAB93867; BAB93867; BAB93867.
DR KEGG; sam:MW0002; -.
DR HOGENOM; CLU_038149_2_0_9; -.
DR OMA; YLIMPVR; -.
DR Proteomes; UP000000418; Chromosome.
DR GO; GO:0005737; C:cytoplasm; IEA:UniProtKB-SubCell.
DR GO; GO:0009360; C:DNA polymerase III complex; IEA:InterPro.
DR GO; GO:0008408; F:3'-5' exonuclease activity; IEA:InterPro.
DR GO; GO:0003677; F:DNA binding; IEA:UniProtKB-KW.
DR GO; GO:0003887; F:DNA-directed DNA polymerase activity; IEA:UniProtKB-KW.
DR GO; GO:0006260; P:DNA replication; IEA:UniProtKB-KW.
DR CDD; cd00140; beta_clamp; 1.
DR InterPro; IPR001001; DNA_polIII_beta.
DR InterPro; IPR022635; DNA_polIII_beta_C.
DR InterPro; IPR022637; DNA_polIII_beta_cen.
DR InterPro; IPR022634; DNA_polIII_beta_N.
DR PANTHER; PTHR30478; PTHR30478; 1.
DR Pfam; PF00712; DNA_pol3_beta; 1.
DR Pfam; PF02767; DNA_pol3_beta_2; 1.
DR Pfam; PF02768; DNA_pol3_beta_3; 1.
DR PIRSF; PIRSF000804; DNA_pol_III_b; 1.
DR SMART; SM00480; POL3Bc; 1.
DR TIGRFAMs; TIGR00663; dnan; 1.
PE 3: Inferred from homology;
KW Cytoplasm; DNA replication; DNA-binding; DNA-directed DNA polymerase;
KW Nucleotidyltransferase; Transferase.
FT CHAIN 1..377
FT /note="Beta sliding clamp"
FT /id="PRO_0000105467"
SQ SEQUENCE 377 AA; 41914 MW; 0A985EF94E044FBC CRC64;
MMEFTIKRDY FITQLNDTLK AISPRTTLPI LTGIKIDAKE HEVILTGSDS EISIEITIPK
TVDGEDIVNI SETGSVVLPG RFFVDIIKKL PGKDVKLSTN EQFQTLITSG HSEFNLSGLD
PDQYPLLPQV SRDDAIQLSV KVLKNVIAQT NFAVSTSETR PVLTGVNWLI QENELICTAT
DSHRLAVRKL QLEDVSENKN VIIPGKALAE LNKIMSDNEE DIDIFFASNQ VLFKVGNVNF
ISRLLEGHYP DTTRLFPENY EIKLSIDNGE FYHAIDRASL LAREGGNNVI KLSTGDDVVE
LSSTSPEIGT VKEEVDANDV EGGSLKISFN SKYMMDALKA IDNDEVEVEF FGTMKPFILK
PKGDDSVTQL ILPIRTY