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A Model for the structure of the ${it Escherichia coli}$ SOS-regulated UmuD$$_{2}$$ protein

大腸菌SOS制御下UmuD$$_{2}$$タンパク質の構造についてのモデル

Sutton, M. D.*; Guzzo, A.*; 鳴海 一成; Costanzo, M.*; Altenbach, C.*; Ferentz, A. E.*; Hubbell, W. L.*; Walker, G. C.*

Sutton, M. D.*; Guzzo, A.*; Narumi, Issei; Costanzo, M.*; Altenbach, C.*; Ferentz, A. E.*; Hubbell, W. L.*; Walker, G. C.*

UmuD$$_{2}$$タンパク質は、大腸菌DNAポリメラーゼの調節サブユニットであり、触媒サブユニットであるUmuCタンパク質と複合体を形成し、DNA損傷薬剤及び紫外線による突然変異誘発促進作用の根本的な機構である「誤りがち損傷乗り越え修復」に重要な役割を果たす。この論文では、実験的解析を基に、UmuD$$_{2}$$ホモ2量体タンパク質の構造についての正確なモデルを構築し、このタンパク質の構造変化とDNAポリメラーゼVの作用調節との密接な関係を考察した。

UmuD$$_{2}$$ protein is a regulatory subunit of ${it Escherichia coli}$ DNA polymerase V. This protein forms a complex with UmuC protein, a catalytic subunit of DNA polymerase V, and plays a important role in error-prone translesion DNA synthesis, which serves as the mechanistic basis for most DNA-damaging agent and UV light mutagenesis. In this paper, based on the results of a combination of experimental studies, we have developed a refined model for the structure of the UmuD$$_{2}$$ homodimer. Implications of the structural change of UmuD$$_{2}$$ protein with respect to its roles in managing the action of DNA polymease V are discussed.

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