ID   RNC_CERSK               Reviewed;         229 AA.
AC   B9KSA7;
DT   28-JUL-2009, integrated into UniProtKB/Swiss-Prot.
DT   24-MAR-2009, sequence version 1.
DT   27-MAR-2024, entry version 79.
DE   RecName: Full=Ribonuclease 3 {ECO:0000255|HAMAP-Rule:MF_00104};
DE            EC=3.1.26.3 {ECO:0000255|HAMAP-Rule:MF_00104};
DE   AltName: Full=Ribonuclease III {ECO:0000255|HAMAP-Rule:MF_00104};
DE            Short=RNase III {ECO:0000255|HAMAP-Rule:MF_00104};
GN   Name=rnc {ECO:0000255|HAMAP-Rule:MF_00104};
GN   OrderedLocusNames=RSKD131_3075;
OS   Cereibacter sphaeroides (strain KD131 / KCTC 12085) (Rhodobacter
OS   sphaeroides).
OC   Bacteria; Pseudomonadota; Alphaproteobacteria; Rhodobacterales;
OC   Paracoccaceae; Cereibacter.
OX   NCBI_TaxID=557760;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=KD131 / KCTC 12085;
RX   PubMed=19028901; DOI=10.1128/jb.01565-08;
RA   Lim S.-K., Kim S.J., Cha S.H., Oh Y.-K., Rhee H.-J., Kim M.-S., Lee J.K.;
RT   "Complete genome sequence of Rhodobacter sphaeroides KD131.";
RL   J. Bacteriol. 191:1118-1119(2009).
CC   -!- FUNCTION: Digests double-stranded RNA. Involved in the processing of
CC       primary rRNA transcript to yield the immediate precursors to the large
CC       and small rRNAs (23S and 16S). Processes some mRNAs, and tRNAs when
CC       they are encoded in the rRNA operon. Processes pre-crRNA and tracrRNA
CC       of type II CRISPR loci if present in the organism. {ECO:0000255|HAMAP-
CC       Rule:MF_00104}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=Endonucleolytic cleavage to 5'-phosphomonoester.; EC=3.1.26.3;
CC         Evidence={ECO:0000255|HAMAP-Rule:MF_00104};
CC   -!- COFACTOR:
CC       Name=Mg(2+); Xref=ChEBI:CHEBI:18420; Evidence={ECO:0000255|HAMAP-
CC         Rule:MF_00104};
CC   -!- SUBUNIT: Homodimer. {ECO:0000255|HAMAP-Rule:MF_00104}.
CC   -!- SUBCELLULAR LOCATION: Cytoplasm {ECO:0000255|HAMAP-Rule:MF_00104}.
CC   -!- SIMILARITY: Belongs to the ribonuclease III family. {ECO:0000255|HAMAP-
CC       Rule:MF_00104}.
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DR   EMBL; CP001150; ACM02935.1; -; Genomic_DNA.
DR   RefSeq; WP_002722419.1; NC_011963.1.
DR   AlphaFoldDB; B9KSA7; -.
DR   SMR; B9KSA7; -.
DR   GeneID; 67448435; -.
DR   KEGG; rsk:RSKD131_3075; -.
DR   HOGENOM; CLU_000907_1_1_5; -.
DR   Proteomes; UP000001597; Chromosome 1.
DR   GO; GO:0005737; C:cytoplasm; IEA:UniProtKB-SubCell.
DR   GO; GO:0046872; F:metal ion binding; IEA:UniProtKB-KW.
DR   GO; GO:0004525; F:ribonuclease III activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0019843; F:rRNA binding; IEA:UniProtKB-KW.
DR   GO; GO:0006397; P:mRNA processing; IEA:UniProtKB-UniRule.
DR   GO; GO:0006364; P:rRNA processing; IEA:UniProtKB-UniRule.
DR   GO; GO:0008033; P:tRNA processing; IEA:UniProtKB-KW.
DR   CDD; cd10845; DSRM_RNAse_III_family; 1.
DR   CDD; cd00593; RIBOc; 1.
DR   Gene3D; 3.30.160.20; -; 1.
DR   Gene3D; 1.10.1520.10; Ribonuclease III domain; 1.
DR   HAMAP; MF_00104; RNase_III; 1.
DR   InterPro; IPR014720; dsRBD_dom.
DR   InterPro; IPR011907; RNase_III.
DR   InterPro; IPR000999; RNase_III_dom.
DR   InterPro; IPR036389; RNase_III_sf.
DR   NCBIfam; TIGR02191; RNaseIII; 1.
DR   PANTHER; PTHR11207:SF0; RIBONUCLEASE 3; 1.
DR   PANTHER; PTHR11207; RIBONUCLEASE III; 1.
DR   Pfam; PF00035; dsrm; 1.
DR   Pfam; PF14622; Ribonucleas_3_3; 1.
DR   SMART; SM00358; DSRM; 1.
DR   SMART; SM00535; RIBOc; 1.
DR   SUPFAM; SSF54768; dsRNA-binding domain-like; 1.
DR   SUPFAM; SSF69065; RNase III domain-like; 1.
DR   PROSITE; PS50137; DS_RBD; 1.
DR   PROSITE; PS00517; RNASE_3_1; 1.
DR   PROSITE; PS50142; RNASE_3_2; 1.
PE   3: Inferred from homology;
KW   Cytoplasm; Endonuclease; Hydrolase; Magnesium; Metal-binding;
KW   mRNA processing; Nuclease; RNA-binding; rRNA processing; rRNA-binding;
KW   tRNA processing.
FT   CHAIN           1..229
FT                   /note="Ribonuclease 3"
FT                   /id="PRO_1000118928"
FT   DOMAIN          7..132
FT                   /note="RNase III"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00104"
FT   DOMAIN          157..226
FT                   /note="DRBM"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00104"
FT   ACT_SITE        49
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00104"
FT   ACT_SITE        121
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00104"
FT   BINDING         45
FT                   /ligand="Mg(2+)"
FT                   /ligand_id="ChEBI:CHEBI:18420"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00104"
FT   BINDING         118
FT                   /ligand="Mg(2+)"
FT                   /ligand_id="ChEBI:CHEBI:18420"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00104"
FT   BINDING         121
FT                   /ligand="Mg(2+)"
FT                   /ligand_id="ChEBI:CHEBI:18420"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00104"
SQ   SEQUENCE   229 AA;  24860 MW;  3E27FE11685904D9 CRC64;
     MKLSADLKAF EGRIGHQFRE PERLLRAVTH SSLSSVTRSD NQRLEFLGDR VLGLVMAEAL
     LAADRAASEG QLAPRFNALV RKETCAAVAR EVALGDVLKL GRSEMMSGGR RKEALLGDAL
     EAVIAAVYLD AGFEAARQLV LRLWGARIAQ VERDARDAKT ALQEWAQARG LPPPTYEAVD
     RSGPDHAPIF TVEVRLGNGE TDRAAAGTKR VAEQAAARAL LARMEARHD
//