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Cell Rep. 2015 Aug 4;12(5):734-42. doi: 10.1016/j.celrep.2015.07.002. Epub 2015 Jul 23.

A Critical SUMO1 Modification of LKB1 Regulates AMPK Activity during Energy Stress.

Author information

1
Department of Cardiology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA; Cancer Biology Program, The University of Texas Graduate School of Biomedical Sciences at Houston, Houston, TX 77030, USA.
2
Computational Bioscience Research Center, Division of Biological and Environmental Sciences and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia.
3
Department of Cardiology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA. Electronic address: etyeh@mdanderson.org.

Abstract

SUMOylation has been implicated in cellular stress adaptation, but its role in regulating liver kinase B1 (LKB1), a major upstream kinase of the energy sensor AMP-activated protein kinase (AMPK), is unknown. Here, we show that energy stress triggers an increase in SUMO1 modification of LKB1, despite a global reduction in both SUMO1 and SUMO2/3 conjugates. During metabolic stress, SUMO1 modification of LKB1 lysine 178 is essential in promoting its interaction with AMPK via a SUMO-interacting motif (SIM) essential for AMPK activation. The LKB1 K178R SUMO mutant had defective AMPK signaling and mitochondrial function, inducing death in energy-deprived cells. These results provide additional insight into how LKB1-AMPK signaling is regulated during energy stress, and they highlight the critical role of SUMOylation in maintaining the cell's energy equilibrium.

PMID:
26212320
DOI:
10.1016/j.celrep.2015.07.002
[Indexed for MEDLINE]
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