Structural basis of HMCES interactions with abasic DNA and multivalent substrate recognition
- Univ. of Toronto, ON (Canada)
- La Jolla Inst. for Immunology, CA (United States); Univ. of San Diego, La Jolla, CA (United States); Sanford Consortium for Regenerative Medicine, La Jolla, CA (United States)
- National Inst. of Health (NIH), Bethesda, MD (United States). National Center for Biotechnology Information and National Library of Medicine
- Univ. of Toronto, ON (Canada); University Health Network, Toronto, ON (Canada)
Embryonic stem cell-specific 5-hydroxymethylcytosine-binding protein (HMCES) can covalently cross-link to abasic sites in single-stranded DNA at stalled replication forks to prevent genome instability. Here, in this paper, we report crystal structures of the human HMCES SOS response-associated peptidase (SRAP) domain in complex with DNA-damage substrates, including HMCES cross-linked with an abasic site within a 3' overhang DNA. HMCES interacts with both single-strand and duplex segments of DNA, with two independent duplex DNA interaction sites identified in the SRAP domain. The HMCES DNA-protein cross-link structure provides structural insights into a novel thiazolidine covalent interaction between the DNA abasic site and conserved Cys 2 of HMCES. Collectively, our structures demonstrate the capacity for the SRAP domain to interact with a variety of single-strand- and double-strand-containing DNA structures found in DNA-damage sites, including 5' and 3' overhang DNAs and gapped DNAs with short single-strand segments.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
- Sponsoring Organization:
- USDOE Office of Science (SC), Biological and Environmental Research (BER); National Institute of General Medical Sciences (NIGMS); National Institutes of Health (NIH); Canadian Institutes of Health Research (CIHR); Natural Sciences and Engineering Research Council of Canada (NSERC); National Library of Medicine (NLM); National Cancer Institute (NCI)
- Grant/Contract Number:
- AC02-05CH11231; AC02-06CH11357; S10 RR029205
- OSTI ID:
- 1543001
- 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
Web of Science
Molecular basis of abasic site sensing in single-stranded DNA by the SRAP domain of E. coli yedK
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journal | August 2019 |
Molecular basis of abasic site sensing in single-stranded DNA by the SRAP domain of E. coli yedK
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journal | August 2019 |
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