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Mitochondrial localization of SESN2

by Tokarchuk, Artem V. , Safronov, Grigoriy G. , Budanov, Andrei V. , Evstafieva, Alexandra G. , Zheltukhin, Andrei O. , Dalina, Alexandra A. , Kovaleva, Irina E. , Chumakov, Peter M. , Lyamzaev, Konstantin G.

in Apoptosis / Autophagy / Biochemistry / Bioengineering / Bioinformatics / Biology and Life Sciences / Cell death / Cell viability / Damage accumulation / Deoxyribonucleic acid / DNA / DNA damage / Ethylenediaminetetraacetic acid / Fibroblasts / Genomes / Glucose / Guanosine triphosphatases / Homeostasis / Immunology / Kinases / Localization / Lysosomes / Metabolism / Mitochondria / Molecular biology / Oxygen / Phagocytosis / Physical Sciences / Proteins / Rapamycin / Reactive oxygen species / Research and Analysis Methods / Respiration / TOR protein / Transcription / Translocation

2020

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Mitochondrial localization of SESN2

2020

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2020

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Journal Article

Mitochondrial localization of SESN2

Tokarchuk, Artem V.,

Safronov, Grigoriy G.,

Budanov, Andrei V.,

Evstafieva, Alexandra G.,

Zheltukhin, Andrei O.,

Dalina, Alexandra A.,

Kovaleva, Irina E.,

Chumakov, Peter M.,

Lyamzaev, Konstantin G.

2020

Overview

SESN2 is a member of the evolutionarily conserved sestrin protein family found in most of the Metazoa species. The SESN2 gene is transcriptionally activated by many stress factors, including metabolic derangements, reactive oxygen species (ROS), and DNA-damage. As a result, SESN2 controls ROS accumulation, metabolism, and cell viability. The best-known function of SESN2 is the inhibition of the mechanistic target of rapamycin complex 1 kinase (mTORC1) that plays a central role in support of cell growth and suppression of autophagy. SESN2 inhibits mTORC1 activity through interaction with the GATOR2 protein complex preventing an inhibitory effect of GATOR2 on the GATOR1 protein complex. GATOR1 stimulates GTPase activity of the RagA/B small GTPase, the component of RagA/B:RagC/D complex, preventing mTORC1 translocation to the lysosomes and its activation by the small GTPase Rheb. Despite the well-established role of SESN2 in mTORC1 inhibition, other SESN2 activities are not well-characterized. We recently showed that SESN2 could control mitochondrial function and cell death via mTORC1-independent mechanisms, and these activities might be explained by direct effects of SESN2 on mitochondria. In this work, we examined mitochondrial localization of SESN2 and demonstrated that SESN2 is located on mitochondria and can be directly involved in the regulation of mitochondrial functions.

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Publisher

Public Library of Science,Public Library of Science (PLoS)

Subject

/ Biology and Life Sciences

/ Cell death