Bifunctional Electrophiles Cross-Link Thioredoxins with Redox Relay Partners in Cells

详细信息    查看全文

• 作者：Matthew R. Naticchia ; Haley A. Brown ; Francisco J. Garcia ; Andrew M. Lamade ; Samantha L. Justice ; Rachelle P. Herrin ; Kevin A. Morano ; James D. West
• 刊名：Chemical Research in Toxicology
• 出版年：2013
• 出版时间：March 18, 2013
• 年：2013
• 卷：26
• 期：3
• 页码：490-497
• 全文大小：432K
• 年卷期：v.26,no.3(March 18, 2013)
• ISSN：1520-5010

文摘

Thioredoxin protects cells against oxidative damage by reducing disulfide bonds in improperly oxidized proteins. Previously, we found that the baker鈥檚 yeast cytosolic thioredoxin Trx2 undergoes cross-linking to form several protein鈥損rotein complexes in cells treated with the bifunctional electrophile divinyl sulfone (DVSF). Here, we report that the peroxiredoxin Tsa1 and the thioredoxin reductase Trr1, both of which function in a redox relay network with thioredoxin, become cross-linked in complexes with Trx2 upon DVSF treatment. Treatment of yeast with other bifunctional electrophiles, including diethyl acetylenedicarboxylate (DAD), mechlorethamine (HN2), and 1,2,3,4-diepoxybutane (DEB), resulted in the formation of similar cross-linked complexes. Cross-linking of Trx2 and Tsa1 to other proteins by DVSF and DAD is dependent on modification of the active site Cys residues within these proteins. In addition, the human cytosolic thioredoxin, cytosolic thioredoxin reductase, and peroxiredoxin 2 form cross-linked complexes to other proteins in the presence of DVSF, although each protein shows different susceptibilities to modification by DAD, HN2, and DEB. Taken together, our results indicate that bifunctional electrophiles potentially disrupt redox homeostasis in yeast and human cells by forming cross-linked complexes between thioredoxins and their redox partners.