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Alkylation of guanine at the O6 atom is a highly mutagenic DNA lesion because it alters the coding specificity of the base causing G:C to A:T transversion mutations. Specific DNA repair enzymes, e.g. O6‐alkylguanin‐DNA‐Transferases (AGT), recognize and repair such damage after looping out the damaged base to transfer it into the enzyme active site. The exact mechanism how the repair enzyme identifies...
The O6‐alkylguanine DNA alkyltransferase (AGT) is a DNA repair enzyme that binds DNA with moderate cooperativity. This cooperativity is important for its search for alkylated bases. A structural model of the cooperative complex of AGT with DNA predicts short‐range interactions between nearest protein neighbors and long‐range interactions between proteins separated in the array. DNA substrates ranging...
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