ID B3PHX8_CELJU Unreviewed; 168 AA.
AC B3PHX8;
DT 02-SEP-2008, integrated into UniProtKB/TrEMBL.
DT 02-SEP-2008, sequence version 1.
DT 27-MAR-2024, entry version 78.
DE RecName: Full=Methylated-DNA--protein-cysteine methyltransferase {ECO:0000256|HAMAP-Rule:MF_00772};
DE EC=2.1.1.63 {ECO:0000256|HAMAP-Rule:MF_00772};
DE AltName: Full=6-O-methylguanine-DNA methyltransferase {ECO:0000256|HAMAP-Rule:MF_00772};
DE Short=MGMT {ECO:0000256|HAMAP-Rule:MF_00772};
DE AltName: Full=O-6-methylguanine-DNA-alkyltransferase {ECO:0000256|HAMAP-Rule:MF_00772};
GN OrderedLocusNames=CJA_3721 {ECO:0000313|EMBL:ACE84982.1};
OS Cellvibrio japonicus (strain Ueda107) (Pseudomonas fluorescens subsp.
OS cellulosa).
OC Bacteria; Pseudomonadota; Gammaproteobacteria; Cellvibrionales;
OC Cellvibrionaceae; Cellvibrio.
OX NCBI_TaxID=498211 {ECO:0000313|EMBL:ACE84982.1, ECO:0000313|Proteomes:UP000001036};
RN [1] {ECO:0000313|EMBL:ACE84982.1, ECO:0000313|Proteomes:UP000001036}
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=Ueda107 {ECO:0000313|EMBL:ACE84982.1,
RC ECO:0000313|Proteomes:UP000001036};
RX PubMed=18556790; DOI=10.1128/JB.01701-07;
RA Deboy R.T., Mongodin E.F., Fouts D.E., Tailford L.E., Khouri H.,
RA Emerson J.B., Mohamoud Y., Watkins K., Henrissat B., Gilbert H.J.,
RA Nelson K.E.;
RT "Insights into plant cell wall degradation from the genome sequence of the
RT soil bacterium Cellvibrio japonicus.";
RL J. Bacteriol. 190:5455-5463(2008).
CC -!- FUNCTION: Involved in the cellular defense against the biological
CC effects of O6-methylguanine (O6-MeG) and O4-methylthymine (O4-MeT) in
CC DNA. Repairs the methylated nucleobase in DNA by stoichiometrically
CC transferring the methyl group to a cysteine residue in the enzyme. This
CC is a suicide reaction: the enzyme is irreversibly inactivated.
CC {ECO:0000256|HAMAP-Rule:MF_00772}.
CC -!- CATALYTIC ACTIVITY:
CC Reaction=a 4-O-methyl-thymidine in DNA + L-cysteinyl-[protein] = a
CC thymidine in DNA + S-methyl-L-cysteinyl-[protein];
CC Xref=Rhea:RHEA:53428, Rhea:RHEA-COMP:10131, Rhea:RHEA-COMP:10132,
CC Rhea:RHEA-COMP:13555, Rhea:RHEA-COMP:13556, ChEBI:CHEBI:29950,
CC ChEBI:CHEBI:82612, ChEBI:CHEBI:137386, ChEBI:CHEBI:137387;
CC EC=2.1.1.63; Evidence={ECO:0000256|HAMAP-Rule:MF_00772};
CC -!- CATALYTIC ACTIVITY:
CC Reaction=a 6-O-methyl-2'-deoxyguanosine in DNA + L-cysteinyl-[protein]
CC = a 2'-deoxyguanosine in DNA + S-methyl-L-cysteinyl-[protein];
CC Xref=Rhea:RHEA:24000, Rhea:RHEA-COMP:10131, Rhea:RHEA-COMP:10132,
CC Rhea:RHEA-COMP:11367, Rhea:RHEA-COMP:11368, ChEBI:CHEBI:29950,
CC ChEBI:CHEBI:82612, ChEBI:CHEBI:85445, ChEBI:CHEBI:85448; EC=2.1.1.63;
CC Evidence={ECO:0000256|HAMAP-Rule:MF_00772};
CC -!- SUBCELLULAR LOCATION: Cytoplasm {ECO:0000256|HAMAP-Rule:MF_00772}.
CC -!- MISCELLANEOUS: This enzyme catalyzes only one turnover and therefore is
CC not strictly catalytic. According to one definition, an enzyme is a
CC biocatalyst that acts repeatedly and over many reaction cycles.
CC {ECO:0000256|HAMAP-Rule:MF_00772}.
CC -!- SIMILARITY: Belongs to the MGMT family. {ECO:0000256|HAMAP-
CC Rule:MF_00772}.
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DR EMBL; CP000934; ACE84982.1; -; Genomic_DNA.
DR RefSeq; WP_012489293.1; NC_010995.1.
DR AlphaFoldDB; B3PHX8; -.
DR STRING; 498211.CJA_3721; -.
DR KEGG; cja:CJA_3721; -.
DR eggNOG; COG0350; Bacteria.
DR HOGENOM; CLU_000445_52_2_6; -.
DR OrthoDB; 9802228at2; -.
DR Proteomes; UP000001036; Chromosome.
DR GO; GO:0005737; C:cytoplasm; IEA:UniProtKB-SubCell.
DR GO; GO:0003908; F:methylated-DNA-[protein]-cysteine S-methyltransferase activity; IEA:UniProtKB-UniRule.
DR GO; GO:0006307; P:DNA dealkylation involved in DNA repair; IEA:UniProtKB-UniRule.
DR GO; GO:0032259; P:methylation; IEA:UniProtKB-KW.
DR CDD; cd06445; ATase; 1.
DR Gene3D; 3.30.160.70; Methylated DNA-protein cysteine methyltransferase domain; 1.
DR Gene3D; 1.10.10.10; Winged helix-like DNA-binding domain superfamily/Winged helix DNA-binding domain; 1.
DR HAMAP; MF_00772; OGT; 1.
DR InterPro; IPR014048; MethylDNA_cys_MeTrfase_DNA-bd.
DR InterPro; IPR036217; MethylDNA_cys_MeTrfase_DNAb.
DR InterPro; IPR008332; MethylG_MeTrfase_N.
DR InterPro; IPR023546; MGMT.
DR InterPro; IPR036631; MGMT_N_sf.
DR InterPro; IPR036388; WH-like_DNA-bd_sf.
DR NCBIfam; TIGR00589; ogt; 1.
DR PANTHER; PTHR10815; METHYLATED-DNA--PROTEIN-CYSTEINE METHYLTRANSFERASE; 1.
DR PANTHER; PTHR10815:SF5; METHYLATED-DNA--PROTEIN-CYSTEINE METHYLTRANSFERASE; 1.
DR Pfam; PF01035; DNA_binding_1; 1.
DR Pfam; PF02870; Methyltransf_1N; 1.
DR SUPFAM; SSF53155; Methylated DNA-protein cysteine methyltransferase domain; 1.
DR SUPFAM; SSF46767; Methylated DNA-protein cysteine methyltransferase, C-terminal domain; 1.
PE 3: Inferred from homology;
KW Cytoplasm {ECO:0000256|HAMAP-Rule:MF_00772};
KW DNA damage {ECO:0000256|HAMAP-Rule:MF_00772};
KW DNA repair {ECO:0000256|HAMAP-Rule:MF_00772};
KW Methyltransferase {ECO:0000256|HAMAP-Rule:MF_00772,
KW ECO:0000313|EMBL:ACE84982.1};
KW Reference proteome {ECO:0000313|Proteomes:UP000001036};
KW Transferase {ECO:0000256|HAMAP-Rule:MF_00772, ECO:0000313|EMBL:ACE84982.1}.
FT DOMAIN 4..75
FT /note="Methylguanine DNA methyltransferase ribonuclease-
FT like"
FT /evidence="ECO:0000259|Pfam:PF02870"
FT DOMAIN 79..158
FT /note="Methylated-DNA-[protein]-cysteine S-
FT methyltransferase DNA binding"
FT /evidence="ECO:0000259|Pfam:PF01035"
FT ACT_SITE 130
FT /note="Nucleophile; methyl group acceptor"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00772"
SQ SEQUENCE 168 AA; 18663 MW; 2E59D24ACEBB0A12 CRC64;
MSHHYRIMES PVGLLTLVAS AKGLVAVLWE DDDKTRVNID LGSQAENHAL LNRVEQQLQE
YFAGKRQQFD LPLDFHGTEF QQQVWRALLT IPYGETRSYL QIARQIGNEK SVRAVGAANG
KNPISIIAPC HRVIGSSGKL TGFAGGLEAK ALLLRLESPD LQADFWHS
//