DSSylation, a novel protein modification targets proteins induced by oxidative stress, and facilitates their degradation in cells
Yinghao Zhang , Fang-Mei Chang , Jianjun Huang , Jacob J. Junco , Shivani K. Maffi , Hannah I. Pridgen , Gabriel Catano , Hong Dang , Xiang Ding , Fuquan Yang , Dae Joon Kim , Thomas J. Slaga , Rongqiao He , Sung-Jen Wei
Protein Cell ›› 2014, Vol. 5 ›› Issue (2) : 124 -140.
DSSylation, a novel protein modification targets proteins induced by oxidative stress, and facilitates their degradation in cells
Timely removal of oxidatively damaged proteins is critical for cells exposed to oxidative stresses; however, cellular mechanism for clearing oxidized proteins is not clear. Our study reveals a novel type of protein modification that may play a role in targeting oxidized proteins and remove them. In this process, DSS1 (deleted in split hand/split foot 1), an evolutionally conserved small protein, is conjugated to proteins induced by oxidative stresses in vitro and in vivo, implying oxidized proteins are DSS1 clients. A subsequent ubiquitination targeting DSS1-protein adducts has been observed, suggesting the client proteins are degraded through the ubiquitin-proteasome pathway. The DSS1 attachment to its clients is evidenced to be an enzymatic process modulated by an unidentified ATPase. We name this novel protein modification as DSSylation, in which DSS1 plays as a modifier, whose attachment may render target proteins a signature leading to their subsequent ubiquitination, thereby recruits proteasome to degrade them.
DSS1 / shfm1 / free radicals / oxidative stress / proteasome / protein modification / DSSylation
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This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
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