ID   DPO43_RHILO             Reviewed;         361 AA.
AC   Q98NW7;
DT   02-AUG-2002, integrated into UniProtKB/Swiss-Prot.
DT   01-OCT-2001, sequence version 1.
DT   03-AUG-2022, entry version 110.
DE   RecName: Full=DNA polymerase IV 3;
DE            Short=Pol IV 3;
DE            EC=2.7.7.7;
GN   Name=dinB3; OrderedLocusNames=mll9709;
OS   Mesorhizobium japonicum (strain LMG 29417 / CECT 9101 / MAFF 303099)
OS   (Mesorhizobium loti (strain MAFF 303099)).
OG   Plasmid pMLb.
OC   Bacteria; Proteobacteria; Alphaproteobacteria; Hyphomicrobiales;
OC   Phyllobacteriaceae; Mesorhizobium.
OX   NCBI_TaxID=266835;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=LMG 29417 / CECT 9101 / MAFF 303099;
RX   PubMed=11214968; DOI=10.1093/dnares/7.6.331;
RA   Kaneko T., Nakamura Y., Sato S., Asamizu E., Kato T., Sasamoto S.,
RA   Watanabe A., Idesawa K., Ishikawa A., Kawashima K., Kimura T., Kishida Y.,
RA   Kiyokawa C., Kohara M., Matsumoto M., Matsuno A., Mochizuki Y.,
RA   Nakayama S., Nakazaki N., Shimpo S., Sugimoto M., Takeuchi C., Yamada M.,
RA   Tabata S.;
RT   "Complete genome structure of the nitrogen-fixing symbiotic bacterium
RT   Mesorhizobium loti.";
RL   DNA Res. 7:331-338(2000).
CC   -!- FUNCTION: Poorly processive, error-prone DNA polymerase involved in
CC       untargeted mutagenesis. Copies undamaged DNA at stalled replication
CC       forks, which arise in vivo from mismatched or misaligned primer ends.
CC       These misaligned primers can be extended by PolIV. Exhibits no 3'-5'
CC       exonuclease (proofreading) activity. May be involved in translesional
CC       synthesis, in conjunction with the beta clamp from PolIII (By
CC       similarity). {ECO:0000250}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=a 2'-deoxyribonucleoside 5'-triphosphate + DNA(n) =
CC         diphosphate + DNA(n+1); Xref=Rhea:RHEA:22508, Rhea:RHEA-COMP:17339,
CC         Rhea:RHEA-COMP:17340, ChEBI:CHEBI:33019, ChEBI:CHEBI:61560,
CC         ChEBI:CHEBI:173112; EC=2.7.7.7;
CC   -!- COFACTOR:
CC       Name=Mg(2+); Xref=ChEBI:CHEBI:18420; Evidence={ECO:0000250};
CC       Note=Binds 2 magnesium ions per subunit. {ECO:0000250};
CC   -!- SUBUNIT: Monomer. {ECO:0000250}.
CC   -!- SUBCELLULAR LOCATION: Cytoplasm {ECO:0000250}.
CC   -!- SIMILARITY: Belongs to the DNA polymerase type-Y family. {ECO:0000305}.
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DR   EMBL; AP003017; BAB54888.1; -; Genomic_DNA.
DR   RefSeq; WP_010916088.1; NC_002682.1.
DR   AlphaFoldDB; Q98NW7; -.
DR   SMR; Q98NW7; -.
DR   STRING; 266835.14028296; -.
DR   EnsemblBacteria; BAB54888; BAB54888; BAB54888.
DR   KEGG; mlo:mll9709; -.
DR   eggNOG; COG0389; Bacteria.
DR   HOGENOM; CLU_012348_1_2_5; -.
DR   OMA; VKKFHGV; -.
DR   OrthoDB; 442163at2; -.
DR   Proteomes; UP000000552; Plasmid pMLb.
DR   GO; GO:0005737; C:cytoplasm; IEA:UniProtKB-SubCell.
DR   GO; GO:0003684; F:damaged DNA binding; IEA:InterPro.
DR   GO; GO:0003887; F:DNA-directed DNA polymerase activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0000287; F:magnesium ion binding; IEA:UniProtKB-UniRule.
DR   GO; GO:0006281; P:DNA repair; IEA:UniProtKB-UniRule.
DR   GO; GO:0006261; P:DNA-templated DNA replication; IEA:UniProtKB-UniRule.
DR   GO; GO:0009432; P:SOS response; IEA:UniProt.
DR   CDD; cd03586; PolY_Pol_IV_kappa; 1.
DR   Gene3D; 3.30.1490.100; -; 1.
DR   Gene3D; 3.30.70.270; -; 1.
DR   HAMAP; MF_01113; DNApol_IV; 1.
DR   InterPro; IPR043502; DNA/RNA_pol_sf.
DR   InterPro; IPR036775; DNA_pol_Y-fam_lit_finger_sf.
DR   InterPro; IPR017961; DNA_pol_Y-fam_little_finger.
DR   InterPro; IPR022880; DNApol_IV.
DR   InterPro; IPR024728; PolY_HhH_motif.
DR   InterPro; IPR043128; Rev_trsase/Diguanyl_cyclase.
DR   InterPro; IPR001126; UmuC.
DR   Pfam; PF00817; IMS; 1.
DR   Pfam; PF11799; IMS_C; 1.
DR   Pfam; PF11798; IMS_HHH; 1.
DR   SUPFAM; SSF100879; SSF100879; 1.
DR   SUPFAM; SSF56672; SSF56672; 1.
DR   PROSITE; PS50173; UMUC; 1.
PE   3: Inferred from homology;
KW   Cytoplasm; DNA damage; DNA repair; DNA replication; DNA-binding;
KW   DNA-directed DNA polymerase; Magnesium; Metal-binding; Mutator protein;
KW   Nucleotidyltransferase; Plasmid; Transferase.
FT   CHAIN           1..361
FT                   /note="DNA polymerase IV 3"
FT                   /id="PRO_0000173938"
FT   DOMAIN          12..192
FT                   /note="UmuC"
FT   ACT_SITE        111
FT                   /evidence="ECO:0000250"
FT   BINDING         16
FT                   /ligand="Mg(2+)"
FT                   /ligand_id="ChEBI:CHEBI:18420"
FT                   /evidence="ECO:0000250"
FT   BINDING         110
FT                   /ligand="Mg(2+)"
FT                   /ligand_id="ChEBI:CHEBI:18420"
FT                   /evidence="ECO:0000250"
FT   SITE            21
FT                   /note="Substrate discrimination"
FT                   /evidence="ECO:0000250"
SQ   SEQUENCE   361 AA;  39531 MW;  384A3E2C8B435E6A CRC64;
     MVPERGADPR KIIHVDMDAF YASVEQRDNP ELRGKPLAVG GAAARGVVAA ASYEARAFGV
     RSAMPSVTAK RKCPELIFVP PRFDVYRAVS AQIRDVFAEH TDLIEPLSLD EAYLDVTQNR
     LNISSATTIA EMIRAKILEV TGLTASAGIS YNKFLAKMAS DQNKPNGQFV ITPRHGPAFV
     ETLPVNKFHG VGPATAAKME ALGIETGADL KERSLSFLQQ HFGKSGLWYY QIARAIDERA
     VDPDRPRKSI GAEDTFAADI VDLETSLAEL KPLVAKVWGY CEGKGIRGRT VTLKIKFADF
     QQITRSRTVA VPIELSDFEH LAADLLGSVF PVRKGIRLLG VTLSSLGDVL PPDQRQLRFE
     L