XPG蛋白具有结构特异性内切酶活性

Kieran G. Cloud, Binghui Shen, Gary F. Strniste, Min S. Park
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引用次数: 37

摘要

利用重组杆状病毒在昆虫细胞中过表达具有生物化学活性的人DNA修复蛋白着色性干皮病G (XPG)。重组杆状病毒在变性聚丙烯酰胺凝胶中产生迁移率约185 kDa的XPG。间接免疫荧光研究表明,重组全长XPG蛋白主要以核蛋白形式表达。重组XPG蛋白采用Q-sepharose, S-300大小排斥,Mono Q柱层析纯化,具有明显的均匀性。XPG蛋白具有结构特异性的DNA内切酶活性,与双链DNA相比,对单链DNA和RNA具有更强的亲和力。
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XPG protein has a structure-specific endonuclease activity

Biochemically active human DNA repair protein, xeroderma pigmentosum G (XPG), was overexpressed in insect cells by a recombinant baculovirus. The recombinant baculovirus produced XPG with a mobility of ∼ 185 kDa in a denaturing polyacrylamide gel. Indirect immunofluorescence studies demonstrated that the recombinant full-length XPG protein was expressed predominantly as a nuclear protein. The recombinant XPG protein was purified to apparent homogeneity using Q-sepharose, S-300 size exclusion, and Mono Q column chromatography. XPG protein showed a structure-specific DNA endonuclease activity, and a preferential affinity to single-stranded DNA and RNA compared to double-stranded DNA.

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