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Y-family polymerases help cells tolerate DNA damage by performing translesion synthesis opposite damaged DNA bases, yet they also have a high intrinsic error rate. We constructed chimeras of two closely related Y-family polymerases that display distinctly different activity profiles and found that the polypeptide linker that tethers the catalytic polymerase domain to the C-terminal DNA-binding domain...
Dbh is a Y family translesion DNA polymerase that accurately bypasses some damaged forms of deoxyguanosine, but also generates single-base deletion errors at frequencies of up to 50%, in specific hot spot sequences. We describe preinsertion binary, insertion ternary, and postinsertion binary crystal structures of Dbh synthesizing DNA after making a single-base deletion. The skipped template base adopts...
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