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| Description: Thus, alkylation of a DNA-guanine stimulates a GC AT transition. Repair of this type of damage involves an unusual enzyme, O6-alkylguanine alkyltransferase, which transfers a methyl or ethyl group from an O6–methylguanine or O6-ethylguanine residue to a cysteine residue in the active site of the protein. Having become alkylated, it cannot remove the alkyl group, and the protein molecule turns over. Picture Stats: Views: 118 Filesize: 12.11kB Height: 366 Width: 127 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=34987 |