Repair pathway for PARP-1 DNA-protein crosslinks.
Repair pathway for PARP-1 DNA-protein crosslinks.
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DOI:
10.1016/j.dnarep.2018.11.004
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发表时间:
2019-01
期刊:
影响因子:
3.8
通讯作者:
Wilson SH
中科院分区:
文献类型:
--
作者:
Prasad R;Horton JK;Dai DP;Wilson SH
Poly(ADP-ribose) polymerase-1 (PARP-1) is a regulatory enzyme involved in many different processes of DNA and RNA metabolism, including DNA repair. Previously, PARP-1 was found capable of forming a covalent DNA-protein crosslink (DPC) at the apurinic/apyrimidinic (AP) site in double-stranded DNA. The C1´ atom of the AP site participates in Schiff base formation with a lysine side chain in PARP-1, and a covalent bond is formed upon reduction of the Schiff base. The PARP-1 DPC is formed in vivo where DPC formation correlates with AP site induction by a monofunctional alkylating agent. Here, we examined repair of PARP-1 DPCs in mouse fibroblasts and found that a proteasome inhibitor, MG-132, reduces repair resulting in accumulation of PARP-1 DPCs and increased alkylating agent cytotoxicity. Using a model DNA substrate mimicking the PARP-1 DPC after proteasomal degradation, we found that repair is completed by a sub-pathway of base excision repair (BER). Tyrosyl-DNA phosphodiesterase 1 was proficient in removing the ring-open AP site sugar at the phosphodiester linkage, leaving an intermediate for processing by other BER enzymes. The results reveal proteasomal degradation of the PARP-1 DPC is active in mouse fibroblasts and that a model repair intermediate is processed by the BER machinery.
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影响因子:
14.9
作者:
Kiianitsa K;Maizels N
通讯作者:
Maizels N
影响因子:
64.5
作者:
Duxin JP;Dewar JM;Yardimci H;Walter JC
通讯作者:
Walter JC
影响因子:
4.8
作者:
Interthal, H;Chen, HJ;Champoux, JJ
通讯作者:
Champoux, JJ
影响因子:
3.8
作者:
Gassman, Natalie R.;Wilson, Samuel H.
通讯作者:
Wilson, Samuel H.
DOI:
10.1073/pnas.1009182107
发表时间:
2010-12-21
影响因子:
11.1
作者:
Khodyreva, S. N.;Prasad, R.;Lavrik, O. I.
通讯作者:
Lavrik, O. I.