ID   CAS2_KORCO              Reviewed;          93 AA.
AC   B1L402;
DT   13-JUN-2012, integrated into UniProtKB/Swiss-Prot.
DT   29-APR-2008, sequence version 1.
DT   03-AUG-2022, entry version 61.
DE   RecName: Full=CRISPR-associated endoribonuclease Cas2 {ECO:0000255|HAMAP-Rule:MF_01471};
DE            EC=3.1.-.- {ECO:0000255|HAMAP-Rule:MF_01471};
GN   Name=cas2 {ECO:0000255|HAMAP-Rule:MF_01471}; OrderedLocusNames=Kcr_0425;
OS   Korarchaeum cryptofilum (strain OPF8).
OC   Archaea; Candidatus Korarchaeota; Candidatus Korarchaeum.
OX   NCBI_TaxID=374847;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=OPF8;
RX   PubMed=18535141; DOI=10.1073/pnas.0801980105;
RA   Elkins J.G., Podar M., Graham D.E., Makarova K.S., Wolf Y., Randau L.,
RA   Hedlund B.P., Brochier-Armanet C., Kunin V., Anderson I., Lapidus A.,
RA   Goltsman E., Barry K., Koonin E.V., Hugenholtz P., Kyrpides N., Wanner G.,
RA   Richardson P., Keller M., Stetter K.O.;
RT   "A korarchaeal genome reveals new insights into the evolution of the
RT   Archaea.";
RL   Proc. Natl. Acad. Sci. U.S.A. 105:8102-8107(2008).
CC   -!- FUNCTION: CRISPR (clustered regularly interspaced short palindromic
CC       repeat), is an adaptive immune system that provides protection against
CC       mobile genetic elements (viruses, transposable elements and conjugative
CC       plasmids). CRISPR clusters contain sequences complementary to
CC       antecedent mobile elements and target invading nucleic acids. CRISPR
CC       clusters are transcribed and processed into CRISPR RNA (crRNA).
CC       Functions as a ssRNA-specific endoribonuclease. Involved in the
CC       integration of spacer DNA into the CRISPR cassette. {ECO:0000255|HAMAP-
CC       Rule:MF_01471}.
CC   -!- COFACTOR:
CC       Name=Mg(2+); Xref=ChEBI:CHEBI:18420;
CC         Evidence={ECO:0000255|HAMAP-Rule:MF_01471};
CC   -!- SUBUNIT: Homodimer, forms a heterotetramer with a Cas1 homodimer.
CC       {ECO:0000255|HAMAP-Rule:MF_01471}.
CC   -!- SIMILARITY: Belongs to the CRISPR-associated endoribonuclease Cas2
CC       protein family. {ECO:0000255|HAMAP-Rule:MF_01471}.
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DR   EMBL; CP000968; ACB07181.1; -; Genomic_DNA.
DR   RefSeq; WP_012309078.1; NC_010482.1.
DR   AlphaFoldDB; B1L402; -.
DR   SMR; B1L402; -.
DR   STRING; 374847.Kcr_0425; -.
DR   EnsemblBacteria; ACB07181; ACB07181; Kcr_0425.
DR   GeneID; 6093712; -.
DR   KEGG; kcr:Kcr_0425; -.
DR   eggNOG; arCOG04194; Archaea.
DR   HOGENOM; CLU_161124_2_1_2; -.
DR   InParanoid; B1L402; -.
DR   OMA; IDIFPIC; -.
DR   OrthoDB; 123741at2157; -.
DR   PhylomeDB; B1L402; -.
DR   Proteomes; UP000001686; Chromosome.
DR   GO; GO:0004521; F:endoribonuclease activity; IEA:InterPro.
DR   GO; GO:0046872; F:metal ion binding; IEA:UniProtKB-UniRule.
DR   GO; GO:0051607; P:defense response to virus; IEA:UniProtKB-UniRule.
DR   GO; GO:0043571; P:maintenance of CRISPR repeat elements; IEA:UniProtKB-UniRule.
DR   CDD; cd09725; Cas2_I_II_III; 1.
DR   HAMAP; MF_01471; Cas2; 1.
DR   InterPro; IPR021127; CRISPR_associated_Cas2.
DR   InterPro; IPR019199; Virulence_VapD/CRISPR_Cas2.
DR   PANTHER; PTHR34405; PTHR34405; 1.
DR   Pfam; PF09827; CRISPR_Cas2; 1.
DR   TIGRFAMs; TIGR01573; cas2; 1.
PE   3: Inferred from homology;
KW   Antiviral defense; Endonuclease; Hydrolase; Magnesium; Metal-binding;
KW   Nuclease; Reference proteome.
FT   CHAIN           1..93
FT                   /note="CRISPR-associated endoribonuclease Cas2"
FT                   /id="PRO_0000417742"
FT   BINDING         13
FT                   /ligand="Mg(2+)"
FT                   /ligand_id="ChEBI:CHEBI:18420"
FT                   /ligand_note="catalytic"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01471"
SQ   SEQUENCE   93 AA;  10630 MW;  C572040E30ABC9A9 CRC64;
     MRGGNLKVLV VYDITDDSLR LKVAEILKDL GLFRIQKSAF IGEMTSQERE NMEEILRRQN
     LGPSDRIDVF PICDRDLKMH SQIGRGKFGR GPP