ID   CAS1A_PYRAE             Reviewed;         302 AA.
AC   Q8ZZU1;
DT   16-MAY-2012, integrated into UniProtKB/Swiss-Prot.
DT   01-MAR-2002, sequence version 1.
DT   03-AUG-2022, entry version 86.
DE   RecName: Full=CRISPR-associated endonuclease Cas1 1 {ECO:0000255|HAMAP-Rule:MF_01470};
DE            EC=3.1.-.- {ECO:0000255|HAMAP-Rule:MF_01470};
GN   Name=cas1-1 {ECO:0000255|HAMAP-Rule:MF_01470}; OrderedLocusNames=PAE0081;
OS   Pyrobaculum aerophilum (strain ATCC 51768 / DSM 7523 / JCM 9630 / CIP
OS   104966 / NBRC 100827 / IM2).
OC   Archaea; Crenarchaeota; Thermoprotei; Thermoproteales; Thermoproteaceae;
OC   Pyrobaculum.
OX   NCBI_TaxID=178306;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC 51768 / DSM 7523 / JCM 9630 / CIP 104966 / NBRC 100827 / IM2;
RX   PubMed=11792869; DOI=10.1073/pnas.241636498;
RA   Fitz-Gibbon S.T., Ladner H., Kim U.-J., Stetter K.O., Simon M.I.,
RA   Miller J.H.;
RT   "Genome sequence of the hyperthermophilic crenarchaeon Pyrobaculum
RT   aerophilum.";
RL   Proc. Natl. Acad. Sci. U.S.A. 99:984-989(2002).
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 spacers, sequences complementary to
CC       antecedent mobile elements, and target invading nucleic acids. CRISPR
CC       clusters are transcribed and processed into CRISPR RNA (crRNA). Acts as
CC       a dsDNA endonuclease. Involved in the integration of spacer DNA into
CC       the CRISPR cassette. {ECO:0000255|HAMAP-Rule:MF_01470}.
CC   -!- COFACTOR:
CC       Name=Mg(2+); Xref=ChEBI:CHEBI:18420;
CC         Evidence={ECO:0000255|HAMAP-Rule:MF_01470};
CC       Name=Mn(2+); Xref=ChEBI:CHEBI:29035;
CC         Evidence={ECO:0000255|HAMAP-Rule:MF_01470};
CC   -!- SUBUNIT: Homodimer, forms a heterotetramer with a Cas2 homodimer.
CC       {ECO:0000255|HAMAP-Rule:MF_01470}.
CC   -!- SIMILARITY: Belongs to the CRISPR-associated endonuclease Cas1 family.
CC       {ECO:0000255|HAMAP-Rule:MF_01470}.
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DR   EMBL; AE009441; AAL62548.1; -; Genomic_DNA.
DR   AlphaFoldDB; Q8ZZU1; -.
DR   SMR; Q8ZZU1; -.
DR   STRING; 178306.PAE0081; -.
DR   EnsemblBacteria; AAL62548; AAL62548; PAE0081.
DR   KEGG; pai:PAE0081; -.
DR   PATRIC; fig|178306.9.peg.56; -.
DR   eggNOG; arCOG01452; Archaea.
DR   HOGENOM; CLU_052779_0_0_2; -.
DR   InParanoid; Q8ZZU1; -.
DR   OMA; YYVGSFY; -.
DR   Proteomes; UP000002439; Chromosome.
DR   GO; GO:0003677; F:DNA binding; IEA:UniProtKB-KW.
DR   GO; GO:0004519; F:endonuclease activity; IEA:UniProtKB-UniRule.
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   Gene3D; 1.20.120.920; -; 1.
DR   Gene3D; 3.100.10.20; -; 1.
DR   HAMAP; MF_01470; Cas1; 1.
DR   InterPro; IPR002729; CRISPR-assoc_Cas1.
DR   InterPro; IPR042206; CRISPR-assoc_Cas1_C.
DR   InterPro; IPR042211; CRISPR-assoc_Cas1_N.
DR   Pfam; PF01867; Cas_Cas1; 1.
DR   TIGRFAMs; TIGR00287; cas1; 1.
PE   3: Inferred from homology;
KW   Antiviral defense; DNA-binding; Endonuclease; Hydrolase; Magnesium;
KW   Manganese; Metal-binding; Nuclease; Reference proteome.
FT   CHAIN           1..302
FT                   /note="CRISPR-associated endonuclease Cas1 1"
FT                   /id="PRO_0000417107"
FT   BINDING         159
FT                   /ligand="Mn(2+)"
FT                   /ligand_id="ChEBI:CHEBI:29035"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01470"
FT   BINDING         219
FT                   /ligand="Mn(2+)"
FT                   /ligand_id="ChEBI:CHEBI:29035"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01470"
FT   BINDING         234
FT                   /ligand="Mn(2+)"
FT                   /ligand_id="ChEBI:CHEBI:29035"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01470"
SQ   SEQUENCE   302 AA;  33382 MW;  ADE97E98CD863135 CRC64;
     MEVVVKDWGV SLGYSRGALV IKKRGGVDRI PLFQVDRIWI LTGGVSISSR LVRALSHHFI
     DVVFFDAKGN PVARLFPPEA NGTVTHRRAQ YEAYLTGRGF ELAKLVTYGK LINQARALRR
     LGQWKREHYG ALAEAASKIA DLAGRIPSCA DVQCVLGHEG AAASLYWDAV SKTTGLPGRN
     PEAADPLNLA LNYGYGVLKY AVWRQAVIHG LDPYAGYIHA DKSGRPSLVL DLMEEFRPHV
     DLLVIRLRPS ADWADGGVLK REIRAMLVEE WTGERLEPVI ARQVGLAVAH LHGQRAYTPH
     QL