ID   RNH_POLAQ               Reviewed;         154 AA.
AC   A4SXM6;
DT   29-APR-2008, integrated into UniProtKB/Swiss-Prot.
DT   15-MAY-2007, sequence version 1.
DT   03-AUG-2022, entry version 87.
DE   RecName: Full=Ribonuclease H {ECO:0000255|HAMAP-Rule:MF_00042};
DE            Short=RNase H {ECO:0000255|HAMAP-Rule:MF_00042};
DE            EC=3.1.26.4 {ECO:0000255|HAMAP-Rule:MF_00042};
GN   Name=rnhA {ECO:0000255|HAMAP-Rule:MF_00042}; OrderedLocusNames=Pnuc_1024;
OS   Polynucleobacter asymbioticus (strain DSM 18221 / CIP 109841 /
OS   QLW-P1DMWA-1) (Polynucleobacter necessarius subsp. asymbioticus).
OC   Bacteria; Proteobacteria; Betaproteobacteria; Burkholderiales;
OC   Burkholderiaceae; Polynucleobacter.
OX   NCBI_TaxID=312153;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=DSM 18221 / CIP 109841 / QLW-P1DMWA-1;
RX   PubMed=22675600; DOI=10.4056/sigs.2395367;
RA   Meincke L., Copeland A., Lapidus A., Lucas S., Berry K.W., Del Rio T.G.,
RA   Hammon N., Dalin E., Tice H., Pitluck S., Richardson P., Bruce D.,
RA   Goodwin L., Han C., Tapia R., Detter J.C., Schmutz J., Brettin T.,
RA   Larimer F., Land M., Hauser L., Kyrpides N.C., Ivanova N., Goker M.,
RA   Woyke T., Wu Q.L., Pockl M., Hahn M.W., Klenk H.P.;
RT   "Complete genome sequence of Polynucleobacter necessarius subsp.
RT   asymbioticus type strain (QLW-P1DMWA-1(T)).";
RL   Stand. Genomic Sci. 6:74-83(2012).
CC   -!- FUNCTION: Endonuclease that specifically degrades the RNA of RNA-DNA
CC       hybrids. {ECO:0000255|HAMAP-Rule:MF_00042}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=Endonucleolytic cleavage to 5'-phosphomonoester.; EC=3.1.26.4;
CC         Evidence={ECO:0000255|HAMAP-Rule:MF_00042};
CC   -!- COFACTOR:
CC       Name=Mg(2+); Xref=ChEBI:CHEBI:18420;
CC         Evidence={ECO:0000255|HAMAP-Rule:MF_00042};
CC       Note=Binds 1 Mg(2+) ion per subunit. May bind a second metal ion at a
CC       regulatory site, or after substrate binding. {ECO:0000255|HAMAP-
CC       Rule:MF_00042};
CC   -!- SUBUNIT: Monomer. {ECO:0000255|HAMAP-Rule:MF_00042}.
CC   -!- SUBCELLULAR LOCATION: Cytoplasm {ECO:0000255|HAMAP-Rule:MF_00042}.
CC   -!- SIMILARITY: Belongs to the RNase H family. {ECO:0000255|HAMAP-
CC       Rule:MF_00042}.
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DR   EMBL; CP000655; ABP34240.1; -; Genomic_DNA.
DR   RefSeq; WP_011902865.1; NC_009379.1.
DR   AlphaFoldDB; A4SXM6; -.
DR   SMR; A4SXM6; -.
DR   STRING; 312153.Pnuc_1024; -.
DR   EnsemblBacteria; ABP34240; ABP34240; Pnuc_1024.
DR   GeneID; 31481398; -.
DR   KEGG; pnu:Pnuc_1024; -.
DR   eggNOG; COG0328; Bacteria.
DR   HOGENOM; CLU_030894_6_0_4; -.
DR   OMA; MQEIEIF; -.
DR   Proteomes; UP000000231; Chromosome.
DR   GO; GO:0005737; C:cytoplasm; IEA:UniProtKB-SubCell.
DR   GO; GO:0000287; F:magnesium ion binding; IEA:UniProtKB-UniRule.
DR   GO; GO:0003676; F:nucleic acid binding; IEA:InterPro.
DR   GO; GO:0004523; F:RNA-DNA hybrid ribonuclease activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0006401; P:RNA catabolic process; IEA:UniProtKB-UniRule.
DR   CDD; cd09278; RNase_HI_prokaryote_like; 1.
DR   Gene3D; 3.30.420.10; -; 1.
DR   HAMAP; MF_00042; RNase_H; 1.
DR   InterPro; IPR012337; RNaseH-like_sf.
DR   InterPro; IPR002156; RNaseH_domain.
DR   InterPro; IPR036397; RNaseH_sf.
DR   InterPro; IPR022892; RNaseHI.
DR   Pfam; PF00075; RNase_H; 1.
DR   SUPFAM; SSF53098; SSF53098; 1.
DR   PROSITE; PS50879; RNASE_H_1; 1.
PE   3: Inferred from homology;
KW   Cytoplasm; Endonuclease; Hydrolase; Magnesium; Metal-binding; Nuclease.
FT   CHAIN           1..154
FT                   /note="Ribonuclease H"
FT                   /id="PRO_0000332648"
FT   DOMAIN          9..150
FT                   /note="RNase H type-1"
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU00408"
FT   BINDING         18
FT                   /ligand="Mg(2+)"
FT                   /ligand_id="ChEBI:CHEBI:18420"
FT                   /ligand_label="1"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00042"
FT   BINDING         18
FT                   /ligand="Mg(2+)"
FT                   /ligand_id="ChEBI:CHEBI:18420"
FT                   /ligand_label="2"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00042"
FT   BINDING         56
FT                   /ligand="Mg(2+)"
FT                   /ligand_id="ChEBI:CHEBI:18420"
FT                   /ligand_label="1"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00042"
FT   BINDING         78
FT                   /ligand="Mg(2+)"
FT                   /ligand_id="ChEBI:CHEBI:18420"
FT                   /ligand_label="1"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00042"
FT   BINDING         142
FT                   /ligand="Mg(2+)"
FT                   /ligand_id="ChEBI:CHEBI:18420"
FT                   /ligand_label="2"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00042"
SQ   SEQUENCE   154 AA;  17208 MW;  9271D8553A3C8D22 CRC64;
     MPHSKHPSSH PHIIIYTDGA CKGNPGPGGW GAVLRSGSHE KHIHGGEKLT TNNRMEICAV
     IFALKALKQR SSVELWTDSQ YVQKGVTEWL EGWKKRGWKT ASKDPVKNAD LWQELDTLLP
     DHDISWHWVR GHNGHPGNEL ADALANKGVE EFLP