title: O6-Methylguanine-DNA transmethylase converts O6-methylguanine thymine base pairs to guanine thymine base pairs in DNA.
abstract: O6-Methylguanine lesions in natural and synthetic DNAs were studied as substrates for the O6-methylguanine-DNA methyltransferase in vitro. The results indicate that O6-methylguanine is repaired by this protein when base paired to T as well as to C in double-stranded DNA. The results also indicate that O6-methylguanine is less subject to repair than previously reported when it is in single-stranded DNA and suggest that O6-methylguanine may not be repaired when it is at the 3' terminus.
mesh_terms: D001482:Base Composition; D004260:DNA Repair; D006147:Guanine / Q000031:analogs & derivatives* / Q000378:metabolism; D008780:Methyltransferases / Q000494:pharmacology*; D019853:O(6)-Methylguanine-DNA Methyltransferase; D013941:Thymine / Q000378:metabolism
chemical_list: D006147:Guanine; C008449:O-(6)-methylguanine; D008780:Methyltransferases; D019853:O(6)-Methylguanine-DNA Methyltransferase; D013941:Thymine