Its catalytic action is more deliberate and error-checking, often associated with repair duties rather than rapid duplication. The palm, finger, and thumb domains typical of polymerases facilitate nucleotide binding, catalysis, and processivity.
DNA Polymerase II Fidelity Control: Ensuring Accurate Repair Synthesis
SOS Response: In bacteria under replication stress, this enzyme is upregulated as part of the SOS response, ensuring continuity of the genetic code. This repair synthesis is crucial for preventing mutations from becoming permanent features of the genome.
This enzyme reads the existing DNA template strand in the 3' to 5' direction and assembles complementary nucleotides in the 5' to 3' direction. Its ability to interact with the clamp proteins allows it to function effectively when the primary replication machinery is stalled.
DNA Polymerase II Fidelity Control: Ensuring Accurate Repair Synthesis
The finger domain positions the incoming nucleotide, while the thumb domain helps stabilize the template strand, ensuring the enzyme functions with high fidelity. In prokaryotes, Polymerase I is primarily involved in removing RNA primers and filling the resulting gaps, whereas Polymerase III is the main replicative enzyme.
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