ID   DPO3B_MYCPA             Reviewed;         399 AA.
AC   Q9L7L6;
DT   27-APR-2001, integrated into UniProtKB/Swiss-Prot.
DT   01-OCT-2000, sequence version 1.
DT   25-MAY-2022, entry version 115.
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=MAP_0002;
OS   Mycolicibacterium paratuberculosis (strain ATCC BAA-968 / K-10)
OS   (Mycobacterium paratuberculosis).
OC   Bacteria; Actinobacteria; Corynebacteriales; Mycobacteriaceae;
OC   Mycobacterium; Mycobacterium avium complex (MAC).
OX   NCBI_TaxID=262316;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RA   Zhang Q., Kapur V.;
RT   "Genomic organization of the Mycobacterium avium subsp. paratuberculosis
RT   origin of replication region.";
RL   Submitted (JAN-2000) to the EMBL/GenBank/DDBJ databases.
RN   [2]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC BAA-968 / K-10;
RX   PubMed=16116077; DOI=10.1073/pnas.0505662102;
RA   Li L., Bannantine J.P., Zhang Q., Amonsin A., May B.J., Alt D., Banerji N.,
RA   Kanjilal S., Kapur V.;
RT   "The complete genome sequence of Mycobacterium avium subspecies
RT   paratuberculosis.";
RL   Proc. Natl. Acad. Sci. U.S.A. 102:12344-12349(2005).
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; AF222789; AAF33689.1; -; Genomic_DNA.
DR   EMBL; AE016958; AAS02319.1; -; Genomic_DNA.
DR   RefSeq; WP_003874371.1; NC_002944.2.
DR   AlphaFoldDB; Q9L7L6; -.
DR   SMR; Q9L7L6; -.
DR   STRING; 262316.MAP_0002; -.
DR   EnsemblBacteria; AAS02319; AAS02319; MAP_0002.
DR   KEGG; mpa:MAP_0002; -.
DR   eggNOG; COG0592; Bacteria.
DR   HOGENOM; CLU_038149_1_1_11; -.
DR   OMA; YLIMPVR; -.
DR   Proteomes; UP000000580; 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; Reference proteome; Transferase.
FT   CHAIN           1..399
FT                   /note="Beta sliding clamp"
FT                   /id="PRO_0000105449"
SQ   SEQUENCE   399 AA;  41570 MW;  A663F96815ED7361 CRC64;
     MDAATTTAGL SDLKFRLVRE SFADAVSWVA KSLPSRPAVP VLSGVLLSGT DEGLTISGFD
     YEVSAEAQVA AEIASPGSVL VSGRLLSDIV RALPNKPIDF YVDGNRVALN CGSARFSLPT
     MAVEDYPTLP TLPEETGTLP ADLFAEAIGQ VAIAAGRDDT LPMLTGIRVE ISGDTVVLAA
     TDRFRLAVRE LTWSAASPDI EAAVLVPAKT LAEAARTGID GSDVRLSLGA GAGVGKDGLL
     GISGNGKRST TRLLDAEFPK FRQLLPAEHT AVATINVAEL TEAIKLVALV ADRGAQVRME
     FSEGSLRLSA GADDVGRAEE DLAVDFAGEP LTIAFNPTYL TDGLGSVRSE RVSFGFTTPG
     KPALLRPASD DDSPPSGSGP FSALPTDYVY LLMPVRLPG