The C-terminal domain of human Rev1 contains independent binding sites for DNA polymerase η and Rev7 subunit of polymerase ζ.

Abstract:

Human Rev1 is a translesion synthesis (TLS) DNA polymerase involved in bypass replication across sites of DNA damage and postreplicational gap-filling. Rev1 plays an essential structural role in TLS by providing a binding platform for other TLS polymerases that insert nucleotides across DNA lesions (polη, polι, polκ) and extend the distorted primer-terminus (polς). We use NMR spectroscopy to demonstrate that the Rev1 C-terminal domain utilizes independent interaction interfaces to simultaneously bind a fragment of the 'inserter' polη and Rev7 subunit of the 'extender' polς, thereby serving as a cassette that may accommodate several polymerases making them instantaneously available for TLS.

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