The actin capping protein in Aspergillus nidulans enhances dynein function without significantly affecting Arp1 filament assembly

Abstract The minus-end-directed microtubule motor cytoplasmic dynein requires the dynactin complex for in vivo functions. The backbone of the vertebrate dynactin complex is the Arp1 (actin-related protein 1) mini-filament whose barbed end binds to the heterodimeric actin capping protein. However, it...

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Autores principales:	Jun Zhang, Rongde Qiu, Xin Xiang
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2018
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/5841cd29cfdb442bb9ab45f7a52dacce
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spelling	oai:doaj.org-article:5841cd29cfdb442bb9ab45f7a52dacce2021-12-02T15:07:51ZThe actin capping protein in Aspergillus nidulans enhances dynein function without significantly affecting Arp1 filament assembly10.1038/s41598-018-29818-42045-2322https://doaj.org/article/5841cd29cfdb442bb9ab45f7a52dacce2018-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-018-29818-4https://doaj.org/toc/2045-2322Abstract The minus-end-directed microtubule motor cytoplasmic dynein requires the dynactin complex for in vivo functions. The backbone of the vertebrate dynactin complex is the Arp1 (actin-related protein 1) mini-filament whose barbed end binds to the heterodimeric actin capping protein. However, it is unclear whether the capping protein is a dynactin component in lower eukaryotic organisms, especially because it does not appear to be a component of the budding yeast dynactin complex. Here our biochemical data show that the capping protein is a component of the dynactin complex in the filamentous fungus Aspergillus nidulans. Moreover, deletion of the gene encoding capping protein alpha (capA) results in a defect in both nuclear distribution and early-endosome transport, two dynein-mediated processes. However, the defect in either process is less severe than that exhibited by a dynein heavy chain mutant or the ∆p25 mutant of dynactin. In addition, loss of capping protein does not significantly affect the assembly of the dynactin Arp1 filament or the formation of the dynein-dynactin-∆C-HookA (Hook in A. nidulans) complex. These results suggest that fungal capping protein is not important for Arp1 filament assembly but its presence is required for enhancing dynein function in vivo.Jun ZhangRongde QiuXin XiangNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 8, Iss 1, Pp 1-14 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Jun Zhang Rongde Qiu Xin Xiang The actin capping protein in Aspergillus nidulans enhances dynein function without significantly affecting Arp1 filament assembly
description	Abstract The minus-end-directed microtubule motor cytoplasmic dynein requires the dynactin complex for in vivo functions. The backbone of the vertebrate dynactin complex is the Arp1 (actin-related protein 1) mini-filament whose barbed end binds to the heterodimeric actin capping protein. However, it is unclear whether the capping protein is a dynactin component in lower eukaryotic organisms, especially because it does not appear to be a component of the budding yeast dynactin complex. Here our biochemical data show that the capping protein is a component of the dynactin complex in the filamentous fungus Aspergillus nidulans. Moreover, deletion of the gene encoding capping protein alpha (capA) results in a defect in both nuclear distribution and early-endosome transport, two dynein-mediated processes. However, the defect in either process is less severe than that exhibited by a dynein heavy chain mutant or the ∆p25 mutant of dynactin. In addition, loss of capping protein does not significantly affect the assembly of the dynactin Arp1 filament or the formation of the dynein-dynactin-∆C-HookA (Hook in A. nidulans) complex. These results suggest that fungal capping protein is not important for Arp1 filament assembly but its presence is required for enhancing dynein function in vivo.
format	article
author	Jun Zhang Rongde Qiu Xin Xiang
author_facet	Jun Zhang Rongde Qiu Xin Xiang
author_sort	Jun Zhang
title	The actin capping protein in Aspergillus nidulans enhances dynein function without significantly affecting Arp1 filament assembly
title_short	The actin capping protein in Aspergillus nidulans enhances dynein function without significantly affecting Arp1 filament assembly
title_full	The actin capping protein in Aspergillus nidulans enhances dynein function without significantly affecting Arp1 filament assembly
title_fullStr	The actin capping protein in Aspergillus nidulans enhances dynein function without significantly affecting Arp1 filament assembly
title_full_unstemmed	The actin capping protein in Aspergillus nidulans enhances dynein function without significantly affecting Arp1 filament assembly
title_sort	actin capping protein in aspergillus nidulans enhances dynein function without significantly affecting arp1 filament assembly
publisher	Nature Portfolio
publishDate	2018
url	https://doaj.org/article/5841cd29cfdb442bb9ab45f7a52dacce
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The actin capping protein in Aspergillus nidulans enhances dynein function without significantly affecting Arp1 filament assembly

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