A CRM1-dependent nuclear export signal controls nucleocytoplasmic translocation of HSCARG, which regulates NF-κB activity

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Mei ZhangXiaofeng Zheng

Abstract

HSCARG is a newly identified nuclear factor-κB (NF-κB) inhibitor that plays important roles in cell growth. Our previous study found that HSCARG could shuttle between the nucleus and cytoplasm by sensing the change in cellular redox states. To further investigate the mechanism of HSCARG translocation and its effect on the regulation of NF-κB activity, we identified a previously uncharacterized nuclear export signal (NES) at residues 272-278 of HSCARG that is required for its cytoplasmic translocation. This leucine-rich NES was found to be mediated by chromosome region maintenance 1. More importantly, accumulation of HSCARG in the nucleus occurred following a mutation in the NES or oxidative stress, which attenuated the inhibition of NF-κB by HSCARG. These results indicate that nucleocytoplasmic translocation of HSCARG plays an important role in fine-tuning NF-κB signaling.

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Citations

Apr 16, 2014·Mediators of Inflammation·Ankita Aggarwal, Devendra K Agrawal
Nov 20, 2014·IUBMB Life·Ramiro Barcia-Vieitez, Juan Ignacio Ramos-Martínez
Dec 5, 2019·Proceedings of the National Academy of Sciences of the United States of America·Weicheng ZangXiaofeng Zheng
Jul 15, 2020·The Journal of Cell Biology·Qiuyuan YinChonglin Yang

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