While often overshadowed by its more prominent counterpart, DNA Polymerase III in prokaryotes, this enzyme plays a specialized and indispensable role. This enzyme reads the existing DNA template strand in the 3' to 5' direction and assembles complementary nucleotides in the 5' to 3' direction.
DNA Polymerase II in SOS Response: Guardian of Genetic Integrity
This repair synthesis is crucial for preventing mutations from becoming permanent features of the genome. When the replication machinery encounters lesions, breaks, or distortions in the DNA helix, Polymerase II is recruited to the site of trouble.
It acts as a backup polymerase, filling in the gaps left by excision repair mechanisms that remove damaged segments. Proofreading Activity: It possesses 3' to 5' exonuclease activity, allowing it to excise incorrectly incorporated nucleotides during repair synthesis.
DNA Polymerase II in SOS Response: Guardian of Genetic Integrity
This measured pace allows for greater accuracy in identifying and correcting mismatches during the synthesis phase. 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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