한빛사 논문
Abstract
Cheolju Lee1, 3, Soon Mi Lee1, Partha Mukhopadhyay5, Seung Jun Kim1, 2, Sang Chul Lee2, Woo-Sung Ahn3, Myeong-Hee Yu4, Gisela Storz5 & Seong Eon Ryu1, 2
1 Center for Cellular Switch Protein Structure, Korea Research Institute of Bioscience and Biotechnology, 52 Euh-eun-dong, Yuseong-gu, Daejeon 305-806, Korea.
2 Systemic Proteomics Research Center, Korea Research Institute of Bioscience and Biotechnology, 52 Euh-eun-dong, Yuseong-gu, Daejeon 305-806, Korea.
3 Life Sciences Division, Korea Institute of Science and Technology, PO Box 131, Cheongryang, Seoul 130-650, Korea.
4 Functional Proteomics Center, Korea Institute of Science and Technology, PO Box 131, Cheongryang, Seoul 130-650, Korea.
5 Cell Biology and Metabolism Branch, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland 20892, USA.
Correspondence should be addressed to Seong Eon Ryu
The Escherichia coli OxyR transcription factor is activated by cellular hydrogen peroxide through the oxidation of reactive cysteines. Although there is substantial evidence for specific disulfide bond formation in the oxidative activation of OxyR, the presence of the disulfide bond has remained controversial. By mass spectrometry analyses and in vivo labeling assays we found that oxidation of OxyR in the formation of a specific disulfide bond between Cys199 and Cys208 in the wild-type protein. In addition, using time-resolved kinetic analyses, we determined that OxyR activation occurs at a rate of 9.7 s-1. The disulfide bond-mediated conformation switch results in a metastable form that is locally strained by 3 kcal mol-1. On the basis of these observations we conclude that OxyR activation requires specific disulfide bond formation and that the rapid kinetic reaction path and conformation strain, respectively, drive the oxidation and reduction of OxyR.
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