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Genes (Basel). 2019 Apr 23;10(4). pii: E315. doi: 10.3390/genes10040315.

The Biochemical Role of the Human NEIL1 and NEIL3 DNA Glycosylases on Model DNA Replication Forks.

Author information

1
Biomedical Research Centre, School of Environment and Life Sciences, Peel Building, University of Salford, Salford, M5 4NT, UK. m.s.albelazi@edu.salford.ac.uk.
2
Biomedical Research Centre, School of Environment and Life Sciences, Peel Building, University of Salford, Salford, M5 4NT, UK. peter.martin@icr.ac.uk.
3
Biomedical Research Centre, School of Environment and Life Sciences, Peel Building, University of Salford, Salford, M5 4NT, UK. soran.mohammed@soton.ac.uk.
4
Chemical Biology, Diagnostics and Therapeutics Group, Chemistry Faculty, University of Southampton, Southampton, SO17 1BJ, UK. soran.mohammed@soton.ac.uk.
5
Biomedical Research Centre, School of Environment and Life Sciences, Peel Building, University of Salford, Salford, M5 4NT, UK. luciano.mutti@hotmail.it.
6
Sbarro Institute for Cancer Research and Molecular Medicine, Center for Biotechnology, College of Science and Technology, Temple University, Philadelphia, PA 19122, USA. luciano.mutti@hotmail.it.
7
Cancer Research Centre, Department of Molecular and Clinical Cancer Medicine, University of Liverpool, 200 London Road, Liverpool L3 9TA, UK. j.parsons@liverpool.ac.uk.
8
Biomedical Research Centre, School of Environment and Life Sciences, Peel Building, University of Salford, Salford, M5 4NT, UK. r.h.elder@salford.ac.uk.

Abstract

Endonuclease VIII-like (NEIL) 1 and 3 proteins eliminate oxidative DNA base damage and psoralen DNA interstrand crosslinks through initiation of base excision repair. Current evidence points to a DNA replication associated repair function of NEIL1 and NEIL3, correlating with induced expression of the proteins in S/G2 phases of the cell cycle. However previous attempts to express and purify recombinant human NEIL3 in an active form have been challenging. In this study, both human NEIL1 and NEIL3 have been expressed and purified from E. coli, and the DNA glycosylase activity of these two proteins confirmed using single- and double-stranded DNA oligonucleotide substrates containing the oxidative bases, 5-hydroxyuracil, 8-oxoguanine and thymine glycol. To determine the biochemical role that NEIL1 and NEIL3 play during DNA replication, model replication fork substrates were designed containing the oxidized bases at one of three specific sites relative to the fork. Results indicate that whilst specificity for 5- hydroxyuracil and thymine glycol was observed, NEIL1 acts preferentially on double-stranded DNA, including the damage upstream to the replication fork, whereas NEIL3 preferentially excises oxidized bases from single stranded DNA and within open fork structures. Thus, NEIL1 and NEIL3 act in concert to remove oxidized bases from the replication fork.

KEYWORDS:

DNA damage; DNA repair; DNA replication; NEI-like DNA glycosylases; base excision repair

Conflict of interest statement

The authors declare no conflict of interest. The funders had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript, and in the decision to publish the results.

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