ID   MGMT_BOVIN              Reviewed;           9 AA.
AC   P29177;
DT   01-DEC-1992, integrated into UniProtKB/Swiss-Prot.
DT   01-DEC-1992, sequence version 1.
DT   11-DEC-2019, entry version 68.
DE   RecName: Full=Methylated-DNA--protein-cysteine methyltransferase;
DE            EC=2.1.1.63;
DE   AltName: Full=6-O-methylguanine-DNA methyltransferase;
DE            Short=MGMT;
DE   AltName: Full=O-6-methylguanine-DNA-alkyltransferase;
DE   Flags: Fragment;
GN   Name=MGMT;
OS   Bos taurus (Bovine).
OC   Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi; Mammalia;
OC   Eutheria; Laurasiatheria; Artiodactyla; Ruminantia; Pecora; Bovidae;
OC   Bovinae; Bos.
OX   NCBI_TaxID=9913;
RN   [1]
RP   PROTEIN SEQUENCE.
RC   TISSUE=Thymus;
RX   PubMed=2308822; DOI=10.1093/nar/18.1.17;
RA   Rydberg B., Hall J., Karran P.;
RT   "Active site amino acid sequence of the bovine O6-methylguanine-DNA
RT   methyltransferase.";
RL   Nucleic Acids Res. 18:17-21(1990).
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   -!- 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:0000255|PROSITE-ProRule:PRU10017};
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:0000255|PROSITE-ProRule:PRU10017};
CC   -!- COFACTOR:
CC       Name=Zn(2+); Xref=ChEBI:CHEBI:29105; Evidence={ECO:0000250};
CC       Note=Binds 1 zinc ion. {ECO:0000250};
CC   -!- SUBCELLULAR LOCATION: Nucleus {ECO:0000305}.
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   -!- SIMILARITY: Belongs to the MGMT family. {ECO:0000305}.
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DR   Proteomes; UP000009136; Unplaced.
DR   GO; GO:0005634; C:nucleus; IEA:UniProtKB-SubCell.
DR   GO; GO:0003677; F:DNA binding; IEA:UniProtKB-KW.
DR   GO; GO:0046872; F:metal ion binding; IEA:UniProtKB-KW.
DR   GO; GO:0003908; F:methylated-DNA-[protein]-cysteine S-methyltransferase activity; IEA:UniProtKB-EC.
DR   GO; GO:0006281; P:DNA repair; IEA:UniProtKB-KW.
DR   GO; GO:0032259; P:methylation; IEA:UniProtKB-KW.
PE   1: Evidence at protein level;
KW   Direct protein sequencing; DNA damage; DNA repair; DNA-binding;
KW   Metal-binding; Methyltransferase; Nucleus; Reference proteome; Transferase;
KW   Zinc.
FT   CHAIN           <1..>9
FT                   /note="Methylated-DNA--protein-cysteine methyltransferase"
FT                   /id="PRO_0000139356"
FT   ACT_SITE        9
FT                   /note="Nucleophile; methyl group acceptor"
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU10017"
FT   NON_TER         1
FT   NON_TER         9
SQ   SEQUENCE   9 AA;  967 MW;  325171A720476047 CRC64;
     NPIPILTPC