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The mechanism of human tyrosyl-DNA phosphodiesterase 1 in the cleavage of AP site and its synthetic analogs.

Abstract：

:The mechanism of hydrolysis of the apurinic/apyrimidinic (AP) site and its synthetic analogs by using tyrosyl-DNA phosphodiesterase 1 (Tdp1) was analyzed. Tdp1 catalyzes the cleavage of AP site and the synthetic analog of the AP site, 3-hydroxy-2(hydroxymethyl)-tetrahydrofuran (THF), in DNA by hydrolysis of the phosphodiester bond between the substituent and 5' adjacent phosphate. The product of Tdp1 cleavage in the case of the AP site is unstable and is hydrolyzed with the formation of 3'- and 5'-margin phosphates. The following repair demands the ordered action of polynucleotide kinase phosphorylase, with XRCC1, DNA polymerase β, and DNA ligase. In the case of THF, Tdp1 generates break with the 5'-THF and the 3'-phosphate termini. Tdp1 is also able to effectively cleave non-nucleotide insertions in DNA, decanediol and diethyleneglycol moieties by the same mechanism as in the case of THF cleavage. The efficiency of Tdp1 catalyzed hydrolysis of AP-site analog correlates with the DNA helix distortion induced by the substituent. The following repair of 5'-THF and other AP-site analogs can be processed by the long-patch base excision repair pathway.

journal_name

DNA Repair (Amst)

journal_title

DNA repair

authors

Lebedeva NA,Rechkunova NI,Ishchenko AA,Saparbaev M,Lavrik OI

doi

10.1016/j.dnarep.2013.09.008

subject

Has Abstract

pub_date

2013-12-01 00:00:00

pages

1037-42

issue

12

eissn

1568-7864

issn

1568-7856

pii

S1568-7864(13)00238-3

journal_volume

12

pub_type

杂志文章

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