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LC3 and STRAP regulate actin filament assembly by JMY during autophagosome formation
During autophagy, actin filament networks move and remodel cellular membranes to form autophagosomes that enclose and metabolize cytoplasmic contents. Two actin regulators, WHAMM and JMY, participate in autophagosome formation, but the signals linking autophagy to actin assembly are poorly understoo...
Autores principales: | , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Rockefeller University Press
2019
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6314544/ https://www.ncbi.nlm.nih.gov/pubmed/30420355 http://dx.doi.org/10.1083/jcb.201802157 |
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author | Hu, Xiaohua Mullins, R. Dyche |
author_facet | Hu, Xiaohua Mullins, R. Dyche |
author_sort | Hu, Xiaohua |
collection | PubMed |
description | During autophagy, actin filament networks move and remodel cellular membranes to form autophagosomes that enclose and metabolize cytoplasmic contents. Two actin regulators, WHAMM and JMY, participate in autophagosome formation, but the signals linking autophagy to actin assembly are poorly understood. We show that, in nonstarved cells, cytoplasmic JMY colocalizes with STRAP, a regulator of JMY’s nuclear functions, on nonmotile vesicles with no associated actin networks. Upon starvation, JMY shifts to motile, LC3-containing membranes that move on actin comet tails. LC3 enhances JMY’s de novo actin nucleation activity via a cryptic actin-binding sequence near JMY’s N terminus, and STRAP inhibits JMY’s ability to nucleate actin and activate the Arp2/3 complex. Cytoplasmic STRAP negatively regulates autophagy. Finally, we use purified proteins to reconstitute LC3- and JMY-dependent actin network formation on membranes and inhibition of network formation by STRAP. We conclude that LC3 and STRAP regulate JMY’s actin assembly activities in trans during autophagy. |
format | Online Article Text |
id | pubmed-6314544 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | Rockefeller University Press |
record_format | MEDLINE/PubMed |
spelling | pubmed-63145442019-01-09 LC3 and STRAP regulate actin filament assembly by JMY during autophagosome formation Hu, Xiaohua Mullins, R. Dyche J Cell Biol Research Articles During autophagy, actin filament networks move and remodel cellular membranes to form autophagosomes that enclose and metabolize cytoplasmic contents. Two actin regulators, WHAMM and JMY, participate in autophagosome formation, but the signals linking autophagy to actin assembly are poorly understood. We show that, in nonstarved cells, cytoplasmic JMY colocalizes with STRAP, a regulator of JMY’s nuclear functions, on nonmotile vesicles with no associated actin networks. Upon starvation, JMY shifts to motile, LC3-containing membranes that move on actin comet tails. LC3 enhances JMY’s de novo actin nucleation activity via a cryptic actin-binding sequence near JMY’s N terminus, and STRAP inhibits JMY’s ability to nucleate actin and activate the Arp2/3 complex. Cytoplasmic STRAP negatively regulates autophagy. Finally, we use purified proteins to reconstitute LC3- and JMY-dependent actin network formation on membranes and inhibition of network formation by STRAP. We conclude that LC3 and STRAP regulate JMY’s actin assembly activities in trans during autophagy. Rockefeller University Press 2019-01-07 /pmc/articles/PMC6314544/ /pubmed/30420355 http://dx.doi.org/10.1083/jcb.201802157 Text en © 2018 Hu and Mullins https://creativecommons.org/licenses/by/4.0/This article is available under a Creative Commons License (Attribution 4.0 International, as described at https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Research Articles Hu, Xiaohua Mullins, R. Dyche LC3 and STRAP regulate actin filament assembly by JMY during autophagosome formation |
title | LC3 and STRAP regulate actin filament assembly by JMY during autophagosome formation |
title_full | LC3 and STRAP regulate actin filament assembly by JMY during autophagosome formation |
title_fullStr | LC3 and STRAP regulate actin filament assembly by JMY during autophagosome formation |
title_full_unstemmed | LC3 and STRAP regulate actin filament assembly by JMY during autophagosome formation |
title_short | LC3 and STRAP regulate actin filament assembly by JMY during autophagosome formation |
title_sort | lc3 and strap regulate actin filament assembly by jmy during autophagosome formation |
topic | Research Articles |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6314544/ https://www.ncbi.nlm.nih.gov/pubmed/30420355 http://dx.doi.org/10.1083/jcb.201802157 |
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