The properties of steric gate mutants reveal different constraints within the active sites of Y-family and A-family DNA polymerases.

Abstract excerpt

Y-family (lesion-bypass) DNA polymerases show the same overall structural features seen in other members of the polymerase superfamily, yet their active sites are more open, with fewer contacts to the DNA and nucleotide substrates. This raises the question of whether analogous active-site side chains play equivalent roles in the bypass polymerases and their classical DNA polymerase counterparts. In Klenow...

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