PMID: 30275308 , Related PDB id: 6M7O

Authors:

Weng PJ, Gao Y, Gregory MT, Wang P, Wang Y, Yang W

Title:

Bypassing a 8,5'-cyclo-2'-deoxyadenosine lesion by human DNA polymerase eta at atomic resolution.

Journal:

Proc Natl Acad Sci U S A. 2018 Oct 1. pii: 1812856115. doi:, 10.1073/pnas.1812856115.

Abstract:

Oxidatively induced DNA lesions 8,5'-cyclopurine-2'-deoxynucleosides (cdPus) are prevalent and cytotoxic by impeding DNA replication and transcription. Both the 5'R- and 5'S-diastereomers of cdPu can be removed by nucleotide excision repair; however, the 5'S-cdPu is more resistant to repair than the 5'R counterpart. Here, we report the crystal structures of human polymerase (Pol) eta bypassing 5'S-8,5'-cyclo-2'-deoxyadenosine (cdA) in insertion and the following two extension steps. The cdA-containing DNA structures vary in response to the protein environment. Supported by the "molecular splint" of Pol eta, the structure of 5'S-cdA at 1.75-A resolution reveals that the backbone is pinched toward the minor groove and the adenine base is tilted. In the templating position, the cdA takes up the extra space usually reserved for the thymine dimer, and dTTP is efficiently incorporated by Pol eta in the presence of Mn(2+) Rigid distortions of the DNA duplex by cdA, however, prevent normal base pairing and hinder immediate primer extension by Pol eta. Our results provide structural insights into the strong replication blockage effect and the mutagenic property of the cdPu lesions in cells.