DNA polymerase IV

UniProtKB accession:  P58965

Grouped By:  Matching UniProtKB accession

UniProtKB description:  Poorly processive, error-prone DNA polymerase involved in translesion repair and untargeted mutagenesis. Copies undamaged DNA at stalled replication forks, which arise in vivo from mismatched or misaligned primer ends. These misaligned primers can be extended by PolIV. Exhibits no 3'-5' exonuclease (proofreading) activity (By similarity). Involved in translesional synthesis. Primer extension fidelity in vitro is temperature-dependent. Inserts a correct base opposite templating bases at 70 degrees Celsius, but at 37 degrees Celsius in addition to correct base pairing, base transitions, transversions and frameshifts can occur. Preferably forms erroneous base pairs C:T. Bypasses 8-oxo-dG oxidative damage by incorporating dATP or dCTP opposite of the damaged DNA template site at both temperatures in vitro (PubMed:37683741).