Exploring the recognition of quadruplex DNA by an engineered Cys2-His2 zinc finger protein.

Exploring the recognition of quadruplex DNA by an engineered Cys2-His2 zinc finger protein.
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DOI:
10.1021/bi050229x
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发表时间:
2006-02-07
期刊:
影响因子:
2.9
通讯作者:
Balasubramanian, S
Balasubramanian, S
中科院分区:
生物学3区
文献类型:
--
作者:
Ladame, S;Schouten, JA;Roldan, J;Redman, JE;Neidle, S;Balasubramanian, S

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我们最近描述了一种工程化的锌指蛋白(Gq 1),其以高特异性结合由人端粒序列5′-(GGTTAG)5-3′形成的分子内G-四链体,并在体外抑制端粒酶的活性。在这里,我们报告定点诱变,生物物理和分子建模研究,提供了新的见解四链体识别的锌指支架。我们发现,任何一个手指的Gq 1可以被替换为相应的手指的Zif 268,没有显着损失的四链体亲和力或四链体与双链体的歧视。用Zif 268替换Gq 1的两个手指,其中一个是手指2,导致四链体识别的显著损害和辨别力的丧失。分子模拟表明,Gq 1的锌指可以结合到人的平行链四链体结构中的稳定安排,而Zif 268-四链体模型显示出显着较弱的结合能。建模还表明,在Gq 1-四链体复合物中的关键蛋白质指残基的重要作用是保持Gq 1在四链体识别的最佳构象。
We have recently described an engineered zinc finger protein (Gq1) that binds with high specificity to the intramolecular G-quadruplex formed by the human telomeric sequence 5′-(GGTTAG)5-3′, and that inhibits the activity of the enzyme telomerase in vitro. Here we report site-directed mutagenesis, biophysical, and molecular modeling studies that provide new insights into quadruplex recognition by the zinc finger scaffold. We show that any one finger of Gq1 can be replaced with the corresponding finger of Zif268, without significant loss of quadruplex affinity or quadruplex versus duplex discrimination. Replacement of two fingers, with one being finger 2, of Gq1 by Zif268 results in significant impairment of quadruplex recognition and loss of discrimination. Molecular modeling suggests that the zinc fingers of Gq1 can bind to the human parallel-stranded quadruplex structure in a stable arrangement, whereas Zif268-quadruplex models show significantly weaker binding energy. Modeling also suggests that an important role of the key protein finger residues in the Gq1-quadruplex complex is to maintain Gq1 in an optimum conformation for quadruplex recognition.
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