Abstract
The PRD1 DNA polymerase is a small multifunctional enzyme containing three major conserved amino acid sequences shared by family B DNA polymerases. Thus, the PRD1 DNA polymerase provides an useful model system with which to study structure-function relationships of DNA polymerase molecules. In order to investigate the functional and structural roles of the highly conserved amino acid sequences, we have introduced mutations into each of the 3 conserved regions of the PRD1 DNA polymerase. Genetic complementation study as well as DNA polymerase assay indicated that each mutation inactivated DNA polymerase catalytic activity, but not the 3′ to 5′ exonuclease activity.
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