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The splicing component ISY1 regulates APE1 in base excision repair.

Abstract：

:The integrity of cellular genome is continuously challenged by endogenous and exogenous DNA damaging agents. If DNA damage is not removed in a timely fashion the replisome may stall at DNA lesions, causing fork collapse and genetic instability. Base excision DNA repair (BER) is the most important pathway for the removal of oxidized or mono-alkylated DNA. While the main components of the BER pathway are well defined, its regulatory mechanism is not yet understood. We report here that the splicing factor ISY1 enhances apurinic/apyrimidinic endonuclease 1 (APE1) activity, the multifunctional enzyme in BER, by promoting its 5'-3' endonuclease activity. ISY1 expression is induced by oxidative damage, which would provide an immediate up-regulation of APE1 activity in vivo and enhance BER of oxidized bases. We further found that APE1 and ISY1 interact, and ISY1 enhances the ability of APE1 to recognize abasic sites in DNA. Using purified recombinant proteins, we reconstituted BER and demonstrated that ISY1 markedly promoted APE1 activity in both the short- and long-patch BER pathways. Our study identified ISY1 as a regulator of the BER pathway, which would be of physiological relevance where suboptimal levels of APE1 are present. The interaction of ISY1 and APE1 also establishes a connection between DNA damage repair and pre-mRNA splicing.

journal_name

DNA Repair (Amst)

journal_title

DNA repair

authors

Jaiswal AS,Williamson EA,Srinivasan G,Kong K,Lomelino CL,McKenna R,Walter C,Sung P,Narayan S,Hromas R

doi

10.1016/j.dnarep.2019.102769

subject

Has Abstract

pub_date

2020-02-01 00:00:00

pages

102769

eissn

1568-7864

issn

1568-7856

pii

S1568-7864(19)30062-X

journal_volume

86

pub_type

杂志文章

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