Mechanism of translesion synthesis past an equine estrogen-DNA adduct by Y-family DNA polymerases.

Mechanism of translesion synthesis past an equine estrogen-DNA adduct by Y-family DNA polymerases.
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Y 家族 DNA 聚合酶通过马雌激素-DNA 加合物的跨损伤合成机制。

DOI:
10.1016/j.jmb.2007.06.009
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发表时间:
2007
影响因子:
5.6
通讯作者:
Shibutani,Shinya
Shibutani,Shinya
中科院分区:
生物学2区
文献类型:
--
作者:
Yasui,Manabu;Suzuki,Naomi;Liu,Xiaoping;Okamoto,Yoshinori;Kim,SungYeon;Laxmi,YRSantosh;Shibutani,Shinya

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4-羟基奎宁(4-OHEN)-DC是马雌激素诱导的一种主要的、潜在的DNA加合物,用于激素替代治疗。为了研究4-OHEN-DC的错误编码特性以及Y家族人DNA聚合酶(POLS)η,κ和ι在这一过程中的作用,我们将4-OHEN-DC掺入寡核苷酸中,并将其作为模板用于POLη,κ和ι催化的引物延伸反应。Polη插入DAMP与4-OHEN-DC相反,并伴有少量的dcMP和dTMP掺入和碱基缺失。POLκ促进碱基缺失以及DAMP和DMP的直接掺入。POLι与POLκ一起工作,但不与POLη一起工作,在被加合物阻碍的复制叉处工作,导致DTMP参入率增加。我们的结果提供了一个直接的证据,证明Y家族DNA Pols在合成过程中可以相互切换,越过损伤。Y-家族酶没有直接掺入正确的碱基dGMP。4-OHEN-DC的错误编码效力可能与在接受激素替代治疗的妇女中观察到的生殖道癌的发生有关。
4-Hydroxyequilenin (4-OHEN)-dC is a major, potentially mutagenic DNA adduct induced by equine estrogens used for hormone replacement therapy. To study the miscoding property of 4-OHEN-dC and the involvement of Y-family human DNA polymerases (pols) η, κ and ι in that process, we incorporated 4-OHEN-dC into oligodeoxynucleotides and used them as templates in primer extension reactions catalyzed by pol η, κ and ι. Pol η inserted dAMP opposite 4-OHEN-dC, accompanied by lesser amounts of dCMP and dTMP incorporation and base deletion. Pol κ promoted base deletions as well as direct incorporation of dAMP and dCMP. Pol ι worked in conjunction with pol κ, but not with pol η, at a replication fork stalled by the adduct, resulting in increased dTMP incorporation. Our results provide a direct evidence that Y-family DNA pols can switch with one another during synthesis past the lesion. No direct incorporation of dGMP, the correct base, was observed with Y-family enzymes. The miscoding potency of 4-OHEN-dC may be associated with the development of reproductive cancers observed in women receiving hormone replacement therapy.
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DOI: 10.1021/bi048087e
发表时间: 2004
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影响因子: --
作者:
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发表时间: 1998
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影响因子: --
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发表时间: 2001
影响因子: 4.1
作者:
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