• tab2, an important upstream adaptor of interleukin-1 signaling pathway, is subject to sumoylation

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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
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     sumoylation has been considered as an important mechanism to regulate multiple cellular processes, including inflammation. tab2 (tak1-binding protein 2) is an upstream adaptor protein in the il-1 signaling pathway. covalent modifications of tab2 have not been well studied. in this study, we demonstrated that tab2 could be modified by sumo. using ubc9 (sumo-conjugating enzyme) fusion and mutation analysis, we identified evolutionarily conserved lysine 329 as the major sumoylation site of tab2. pias3, a sumo e3 ligase, preferentially interacted with and promoted its sumoylation. interestingly, block of sumoylation by mutation of lysine 329 enhanced the activity of tab2, as reflected by ap-1 luciferase reporter assays. taken together, these results suggest that sumoylation may serve as a novel mechanism for the regulation of tab2.

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