Abstract

Examination of the electrostatic potential of a modeled complex, consisting of the Klenow fragment of E. coli DNA polymerase I and DNA template-primer, suggested the presence of two distinct interacting regions. The one displaying a strong electropositive potential field is generated by side chains of basic amino acid pairs and is directed towards the major groove site in DNA. The second electrostatic potential field around DNA is somewhat weaker and appears to be exerted by a pair of vicinal side chains of acidic and basic amino acids. The distribution of charges in this manner appears well suited for the binding of enzyme to the template-primer required in the enzymatic synthesis of DNA.

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