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p38 MAP kinase–dependent phosphorylation of the Gp78 E3 ubiquitin ligase controls ER–mitochondria association and mitochondria motility

Gp78 is an ERAD-associated E3 ubiquitin ligase that induces degradation of the mitofusin mitochondrial fusion proteins and mitochondrial fission. Gp78 is localized throughout the ER; however, the anti-Gp78 3F3A monoclonal antibody (mAb) recognizes Gp78 selectively in mitochondria-associated ER domai...

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Autores principales: Li, Lei, Gao, Guang, Shankar, Jay, Joshi, Bharat, Foster, Leonard J., Nabi, Ivan R.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The American Society for Cell Biology 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4626067/
https://www.ncbi.nlm.nih.gov/pubmed/26337390
http://dx.doi.org/10.1091/mbc.E15-02-0120
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author Li, Lei
Gao, Guang
Shankar, Jay
Joshi, Bharat
Foster, Leonard J.
Nabi, Ivan R.
author_facet Li, Lei
Gao, Guang
Shankar, Jay
Joshi, Bharat
Foster, Leonard J.
Nabi, Ivan R.
author_sort Li, Lei
collection PubMed
description Gp78 is an ERAD-associated E3 ubiquitin ligase that induces degradation of the mitofusin mitochondrial fusion proteins and mitochondrial fission. Gp78 is localized throughout the ER; however, the anti-Gp78 3F3A monoclonal antibody (mAb) recognizes Gp78 selectively in mitochondria-associated ER domains. Epitope mapping localized the epitope of 3F3A and a commercial anti-Gp78 mAb to an 8–amino acid motif (533–541) in mouse Gp78 isoform 2 that forms part of a highly conserved 41–amino acid region containing 14-3-3– and WW-binding domains and a p38 MAP kinase (p38 MAPK) consensus site on Ser-538 (S538). 3F3A binds selectively to nonphosphorylated S538 Gp78. Using 3F3A as a reporter, we induced Gp78 S538 phosphorylation by serum starvation and showed it to be mediated by p38 MAPK. Mass spectroscopy analysis of Gp78 phosphopeptides confirmed S538 as a major p38 MAPK phosphorylation site on Gp78. Gp78 S538 phosphorylation limited its ability to induce mitochondrial fission and degrade MFN1 and MFN2 but did not affect in vitro Gp78 ubiquitin E3 ligase activity. Phosphomimetic Gp78 S538D mutation prevented Gp78 promotion of ER–mitochondria interaction, and SB203580 inhibition of p38 MAPK increased ER–mitochondria association. p38 MAPK phosphorylation of Gp78 S538 therefore regulates Gp78-dependent ER–mitochondria association and mitochondria motility.
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spelling pubmed-46260672016-01-16 p38 MAP kinase–dependent phosphorylation of the Gp78 E3 ubiquitin ligase controls ER–mitochondria association and mitochondria motility Li, Lei Gao, Guang Shankar, Jay Joshi, Bharat Foster, Leonard J. Nabi, Ivan R. Mol Biol Cell Articles Gp78 is an ERAD-associated E3 ubiquitin ligase that induces degradation of the mitofusin mitochondrial fusion proteins and mitochondrial fission. Gp78 is localized throughout the ER; however, the anti-Gp78 3F3A monoclonal antibody (mAb) recognizes Gp78 selectively in mitochondria-associated ER domains. Epitope mapping localized the epitope of 3F3A and a commercial anti-Gp78 mAb to an 8–amino acid motif (533–541) in mouse Gp78 isoform 2 that forms part of a highly conserved 41–amino acid region containing 14-3-3– and WW-binding domains and a p38 MAP kinase (p38 MAPK) consensus site on Ser-538 (S538). 3F3A binds selectively to nonphosphorylated S538 Gp78. Using 3F3A as a reporter, we induced Gp78 S538 phosphorylation by serum starvation and showed it to be mediated by p38 MAPK. Mass spectroscopy analysis of Gp78 phosphopeptides confirmed S538 as a major p38 MAPK phosphorylation site on Gp78. Gp78 S538 phosphorylation limited its ability to induce mitochondrial fission and degrade MFN1 and MFN2 but did not affect in vitro Gp78 ubiquitin E3 ligase activity. Phosphomimetic Gp78 S538D mutation prevented Gp78 promotion of ER–mitochondria interaction, and SB203580 inhibition of p38 MAPK increased ER–mitochondria association. p38 MAPK phosphorylation of Gp78 S538 therefore regulates Gp78-dependent ER–mitochondria association and mitochondria motility. The American Society for Cell Biology 2015-11-01 /pmc/articles/PMC4626067/ /pubmed/26337390 http://dx.doi.org/10.1091/mbc.E15-02-0120 Text en © 2015 Li, Gao, et al. This article is distributed by The American Society for Cell Biology under license from the author(s). Two months after publication it is available to the public under an Attribution–Noncommercial–Share Alike 3.0 Unported Creative Commons License (http://creativecommons.org/licenses/by-nc-sa/3.0). “ASCB®,” “The American Society for Cell Biology®,” and “Molecular Biology of the Cell®” are registered trademarks of The American Society for Cell Biology.
spellingShingle Articles
Li, Lei
Gao, Guang
Shankar, Jay
Joshi, Bharat
Foster, Leonard J.
Nabi, Ivan R.
p38 MAP kinase–dependent phosphorylation of the Gp78 E3 ubiquitin ligase controls ER–mitochondria association and mitochondria motility
title p38 MAP kinase–dependent phosphorylation of the Gp78 E3 ubiquitin ligase controls ER–mitochondria association and mitochondria motility
title_full p38 MAP kinase–dependent phosphorylation of the Gp78 E3 ubiquitin ligase controls ER–mitochondria association and mitochondria motility
title_fullStr p38 MAP kinase–dependent phosphorylation of the Gp78 E3 ubiquitin ligase controls ER–mitochondria association and mitochondria motility
title_full_unstemmed p38 MAP kinase–dependent phosphorylation of the Gp78 E3 ubiquitin ligase controls ER–mitochondria association and mitochondria motility
title_short p38 MAP kinase–dependent phosphorylation of the Gp78 E3 ubiquitin ligase controls ER–mitochondria association and mitochondria motility
title_sort p38 map kinase–dependent phosphorylation of the gp78 e3 ubiquitin ligase controls er–mitochondria association and mitochondria motility
topic Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4626067/
https://www.ncbi.nlm.nih.gov/pubmed/26337390
http://dx.doi.org/10.1091/mbc.E15-02-0120
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