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Title: Protection of abasic sites during DNA replication by a stable thiazolidine protein-DNA cross-link

Journal Article · · Nature Structural & Molecular Biology

Abasic (AP) sites are one of the most common DNA lesions that block replicative polymerases. 5-hydroxymethylcytosine binding, embryonic stem cell-specific protein (HMCES) recognizes and processes these lesions in the context of single-stranded DNA (ssDNA). A HMCES DNA-protein cross-link (DPC) intermediate is thought to shield the AP site from endonucleases and error-prone polymerases. The highly evolutionarily conserved SOS-response associated peptidase (SRAP) domain of HMCES and its Escherichia coli ortholog YedK mediate lesion recognition. Here we uncover the basis of AP site protection by SRAP domains from a crystal structure of the YedK DPC. We report YedK forms a stable thiazolidine linkage between a ring-opened AP site and the α-amino and sulfhydryl substituents of its amino-terminal cysteine residue. The thiazolidine linkage explains the remarkable stability of the HMCES DPC, its resistance to strand cleavage and the proteolysis requirement for resolution. Furthermore, its structure reveals that HMCES has specificity for AP sites in ssDNA at junctions found when replicative polymerases encounter the AP lesion.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
National Institutes of Health (NIH); Vanderbilt Molecular Biophysics Training Program; Vanderbilt-Ingram Cancer Center; USDOE Office of Science (SC), Basic Energy Sciences (BES); Michigan Economic Development Corporation and the Michigan Technology Tri-Corridor
Grant/Contract Number:
R01ES030575; R01GM117299; P01CA092584; AC02-06CH11357; 085P1000817
OSTI ID:
1544876
Journal Information:
Nature Structural & Molecular Biology, Vol. 26, Issue 7; ISSN 1545-9993
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 59 works
Citation information provided by
Web of Science

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Cited By (2)

Molecular basis of abasic site sensing in single-stranded DNA by the SRAP domain of E. coli yedK journal August 2019
Advances in DNA Repair—Emerging Players in the Arena of Eukaryotic DNA Repair journal May 2020

Figures / Tables (5)