Site directed mutagenesis of two cysteine residues in the E. coli ogt O6-alkylguanine DNA alkyltransferase protein.
Affiliation
CRC Department of Chemical Carcinogenesis, Paterson Institute for Cancer Research, Christie Hospital and Holt Radium Institute, Manchester, UK.Issue Date
1992-08-31
Metadata
Show full item recordAbstract
The E. coli ogt O6-alkylguanine-DNA alkyltransferase has two cysteine residues positioned identically with respect to cysteines in the E. coli ada O6-alkylguanine-DNA alkyltransferase. In order to assess their function, these residues were each substituted by a glycine to generate altered forms of the ogt protein. Mutagenesis of cysteine-139, located within a 'PCHRV' region of homology, eliminated functional activity confirming that this residue is the methyl-accepting cysteine in the active site of the protein. Substitution of cysteine 102 within the sequence 'LRTIPCG' had little effect on the ogt protein activity demonstrating that this cysteine is not directly involved with the transfer of O6-methylguanine adducts.Citation
Site directed mutagenesis of two cysteine residues in the E. coli ogt O6-alkylguanine DNA alkyltransferase protein. 1992, 187 (1):425-31 Biochem. Biophys. Res. Commun.Journal
Biochemical and Biophysical Research CommunicationsDOI
10.1016/S0006-291X(05)81510-4PubMed ID
1520330Type
ArticleLanguage
enISSN
0006-291Xae974a485f413a2113503eed53cd6c53
10.1016/S0006-291X(05)81510-4