ID D8G8P8_9CYAN Unreviewed; 555 AA.
AC D8G8P8;
DT 05-OCT-2010, integrated into UniProtKB/TrEMBL.
DT 05-OCT-2010, sequence version 1.
DT 24-JAN-2024, entry version 49.
DE RecName: Full=CRISPR-associated endonuclease Cas1 {ECO:0000256|HAMAP-Rule:MF_01470};
DE EC=3.1.-.- {ECO:0000256|HAMAP-Rule:MF_01470};
GN Name=cas1 {ECO:0000256|HAMAP-Rule:MF_01470};
GN ORFNames=OSCI_3980003 {ECO:0000313|EMBL:CBN58988.1};
OS Kamptonema sp. PCC 6506.
OC Bacteria; Cyanobacteriota; Cyanophyceae; Oscillatoriophycideae;
OC Oscillatoriales; Microcoleaceae; Kamptonema.
OX NCBI_TaxID=272129 {ECO:0000313|EMBL:CBN58988.1, ECO:0000313|Proteomes:UP000004532};
RN [1] {ECO:0000313|Proteomes:UP000004532}
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=PCC 6506 {ECO:0000313|Proteomes:UP000004532};
RX PubMed=20675499; DOI=10.1128/JB.00704-10;
RA Mejean A., Mazmouz R., Mann S., Calteau A., Medigue C., Ploux O.;
RT "The genome sequence of the cyanobacterium Oscillatoria sp. PCC 6506
RT reveals several gene clusters responsible for the biosynthesis of toxins
RT and secondary metabolites.";
RL J. Bacteriol. 192:5264-5265(2010).
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:0000256|HAMAP-Rule:MF_01470}.
CC -!- CATALYTIC ACTIVITY:
CC Reaction=exonucleolytic cleavage in the 5'- to 3'-direction to yield
CC nucleoside 3'-phosphates.; EC=3.1.12.1;
CC Evidence={ECO:0000256|ARBA:ARBA00033996};
CC -!- COFACTOR:
CC Name=Mg(2+); Xref=ChEBI:CHEBI:18420;
CC Evidence={ECO:0000256|HAMAP-Rule:MF_01470};
CC Name=Mn(2+); Xref=ChEBI:CHEBI:29035;
CC Evidence={ECO:0000256|HAMAP-Rule:MF_01470};
CC -!- SUBUNIT: Homodimer, forms a heterotetramer with a Cas2 homodimer.
CC {ECO:0000256|ARBA:ARBA00038592, ECO:0000256|HAMAP-Rule:MF_01470}.
CC -!- SIMILARITY: Belongs to the CRISPR-associated endonuclease Cas1 family.
CC {ECO:0000256|HAMAP-Rule:MF_01470}.
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DR EMBL; CACA01000360; CBN58988.1; -; Genomic_DNA.
DR RefSeq; WP_007358159.1; NZ_CACA01000360.1.
DR AlphaFoldDB; D8G8P8; -.
DR OrthoDB; 9803119at2; -.
DR Proteomes; UP000004532; Unassembled WGS sequence.
DR GO; GO:0003677; F:DNA binding; IEA:UniProtKB-KW.
DR GO; GO:0004520; F:DNA endonuclease activity; IEA:InterPro.
DR GO; GO:0051536; F:iron-sulfur cluster binding; IEA:UniProtKB-KW.
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; cd09634; Cas1_I-II-III; 1.
DR Gene3D; 3.90.320.10; -; 1.
DR Gene3D; 1.20.120.920; CRISPR-associated endonuclease Cas1, C-terminal domain; 1.
DR Gene3D; 3.100.10.20; CRISPR-associated endonuclease Cas1, N-terminal domain; 1.
DR HAMAP; MF_01470; Cas1; 1.
DR InterPro; IPR002729; CRISPR-assoc_Cas1.
DR InterPro; IPR042206; CRISPR-assoc_Cas1_C.
DR InterPro; IPR023844; CRISPR-assoc_Cas1_MYXAN.
DR InterPro; IPR042211; CRISPR-assoc_Cas1_N.
DR InterPro; IPR013343; CRISPR-assoc_prot_Cas4.
DR InterPro; IPR022765; Dna2/Cas4_DUF83.
DR InterPro; IPR011604; PDDEXK-like_dom_sf.
DR NCBIfam; TIGR00287; cas1; 1.
DR NCBIfam; TIGR03983; cas1_MYXAN; 1.
DR NCBIfam; TIGR00372; cas4; 1.
DR PANTHER; PTHR34353; CRISPR-ASSOCIATED ENDONUCLEASE CAS1 1; 1.
DR PANTHER; PTHR34353:SF2; CRISPR-ASSOCIATED ENDONUCLEASE CAS1 1; 1.
DR Pfam; PF01867; Cas_Cas1; 1.
DR Pfam; PF01930; Cas_Cas4; 1.
PE 3: Inferred from homology;
KW Antiviral defense {ECO:0000256|ARBA:ARBA00023118, ECO:0000256|HAMAP-
KW Rule:MF_01470};
KW DNA-binding {ECO:0000256|ARBA:ARBA00023125, ECO:0000256|HAMAP-
KW Rule:MF_01470};
KW Endonuclease {ECO:0000256|ARBA:ARBA00022759, ECO:0000256|HAMAP-
KW Rule:MF_01470};
KW Hydrolase {ECO:0000256|ARBA:ARBA00022801, ECO:0000256|HAMAP-Rule:MF_01470};
KW Iron {ECO:0000256|ARBA:ARBA00023004};
KW Iron-sulfur {ECO:0000256|ARBA:ARBA00023014};
KW Magnesium {ECO:0000256|ARBA:ARBA00022842, ECO:0000256|HAMAP-Rule:MF_01470};
KW Manganese {ECO:0000256|ARBA:ARBA00023211, ECO:0000256|HAMAP-Rule:MF_01470};
KW Metal-binding {ECO:0000256|ARBA:ARBA00022723, ECO:0000256|HAMAP-
KW Rule:MF_01470};
KW Nuclease {ECO:0000256|ARBA:ARBA00022722, ECO:0000256|HAMAP-Rule:MF_01470};
KW Reference proteome {ECO:0000313|Proteomes:UP000004532}.
FT DOMAIN 20..196
FT /note="DUF83"
FT /evidence="ECO:0000259|Pfam:PF01930"
FT BINDING 377
FT /ligand="Mn(2+)"
FT /ligand_id="ChEBI:CHEBI:29035"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_01470"
FT BINDING 446
FT /ligand="Mn(2+)"
FT /ligand_id="ChEBI:CHEBI:29035"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_01470"
FT BINDING 461
FT /ligand="Mn(2+)"
FT /ligand_id="ChEBI:CHEBI:29035"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_01470"
SQ SEQUENCE 555 AA; 63548 MW; 309054EF7759ADFC CRC64;
MQLLEIDYFS PPKQSTIRVS ALHAIAYCPR LFYLEEVEEL YTQDAAVFAG RRLHVEIEKQ
EDEDWEDLYL ESEELGLRGR LDALRTRDGQ TIPYEHKRGR CHRDAHNQPQ AWESDRIQIL
AYAYLIESAL RIPVPEGRIR YHADNVMVRV PFDDTGRAAV REAIEQARSL RQSPCRPPVT
DNERLCTRCS LAPVCLPEEA RLAHNREWQP IRLFPEDDER QIVHVLEPGT SVGRCGEQIK
ISRRNQPTEI LPARQIGQIV LHSFSQISTQ ALYFCTEQAI GIHFVSGGGR YVGSFDARGG
SIQRRIRQYE ALSNSQNCLE LARKLVICRG QGQRKFLMRG GRGKEAPEEL KKAINQMKIV
LAQVPQAKAL ENLLGLEGNL AALYFGALPY LIGNDVSPLL NFCGRNRRPP KDRFNALLSF
GYALLIKDVM NAILTVGLEP ALGFYHQPRS QAAPLALDLM EIFRVPLVDM VVMGSINRGQ
WQPQTDFEIR GEQVWLNEAG RRKIVDLYER RKEETWKHPV TGYSLTYRRL LELEVRLLEK
EWMGEGGLFA QLIVR
//
