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Tytuł pozycji:

The small GTPase RABA2a recruits SNARE proteins to regulate the secretory pathway in parallel with the exocyst complex in Arabidopsis.

Tytuł:
The small GTPase RABA2a recruits SNARE proteins to regulate the secretory pathway in parallel with the exocyst complex in Arabidopsis.
Autorzy:
Pang L; Key Laboratory of Molecular Design for Plant Cell Factory of Guangdong Higher Education Institutes, Institute of Plant and Food Science, School of Life Sciences, Southern University of Science and Technology, Shenzhen 518055, China.
Ma Z; School of Biological Sciences, Nanyang Technological University, Singapore 637551, Singapore.
Zhang X; College of Biological Sciences and Technology, Beijing Forestry University, Beijing 100083, China.
Huang Y; Key Laboratory of Molecular Design for Plant Cell Factory of Guangdong Higher Education Institutes, Institute of Plant and Food Science, School of Life Sciences, Southern University of Science and Technology, Shenzhen 518055, China.
Li R; College of Biological Sciences and Technology, Beijing Forestry University, Beijing 100083, China.
Miao Y; School of Biological Sciences, Nanyang Technological University, Singapore 637551, Singapore.
Li R; Key Laboratory of Molecular Design for Plant Cell Factory of Guangdong Higher Education Institutes, Institute of Plant and Food Science, School of Life Sciences, Southern University of Science and Technology, Shenzhen 518055, China. Electronic address: .
Źródło:
Molecular plant [Mol Plant] 2022 Mar 07; Vol. 15 (3), pp. 398-418. Date of Electronic Publication: 2021 Nov 16.
Typ publikacji:
Journal Article; Research Support, Non-U.S. Gov't
Język:
English
Imprint Name(s):
Publication: 2015- : Cambridge, MA Cell Press
Original Publication: Oxford, England : Oxford University Press, 2008-
MeSH Terms:
Arabidopsis*/genetics
Arabidopsis*/metabolism
Monomeric GTP-Binding Proteins*/metabolism
Arabidopsis Proteins/*metabolism
Arabidopsis Proteins/genetics ; Cell Membrane/metabolism ; SNARE Proteins/genetics ; SNARE Proteins/metabolism ; Secretory Pathway ; rab GTP-Binding Proteins/metabolism
Contributed Indexing:
Keywords: RABA2a; SNARE complex; exocyst; secretory process
Substance Nomenclature:
0 (Arabidopsis Proteins)
0 (SNARE Proteins)
EC 3.6.1.-. (Rab GTPase 11C, Arabidopsis thaliana)
EC 3.6.5.2 (Monomeric GTP-Binding Proteins)
EC 3.6.5.2 (rab GTP-Binding Proteins)
Entry Date(s):
Date Created: 20211119 Date Completed: 20220407 Latest Revision: 20220531
Update Code:
20240105
DOI:
10.1016/j.molp.2021.11.008
PMID:
34798312
Czasopismo naukowe
Delivery of proteins to the plasma membrane occurs via secretion, which requires tethering, docking, priming, and fusion of vesicles. In yeast and mammalian cells, an evolutionarily conserved RAB GTPase activation cascade functions together with the exocyst and SNARE proteins to coordinate vesicle transport with fusion at the plasma membrane. However, it is unclear whether this is the case in plants. In this study, we show that the small GTPase RABA2a recruits and interacts with the VAMP721/722-SYP121-SNAP33 SNARE ternary complex for membrane fusion. Through immunoprecipitation coupled with mass spectrometry analysis followed by the validatation with a series of biochemical assays, we identified the SNARE proteins VAMP721 and SYP121 as the interactors and downstream effectors of RABA2a. Further expreiments showed that RABA2a interacts with all members of the SNARE complex in its GTP-bound form and modulates the assembly of the VAMP721/722-SYP121-SNAP33 SNARE ternary complex. Intriguingly, we did not observe the interaction of the exocyst subunits with either RABA2a or theSNARE proteins in several different experiments. Neither RABA2a inactivation affects the subcellular localization or assembly of the exocystnor the exocyst subunit mutant exo84b shows the disrupted RABA2a-SNARE association or SNARE assembly, suggesting that the RABA2a-SNARE- and exocyst-mediated secretory pathways are largely independent. Consistently, our live imaging experiments reveal that the two sets of proteins follow non-overlapping trafficking routes, and genetic and cell biologyanalyses indicate that the two pathways select different cargos. Finally, we demonstrate that the plant-specific RABA2a-SNARE pathway is essential for the maintenance of potassium homeostasis in Arabisopsis seedlings. Collectively, our findings imply that higher plants might have generated different endomembrane sorting pathways during evolution and may enable the highly conserved endomembrane proteins to participate in plant-specific trafficking mechanisms for adaptation to the changing environment.
(Copyright © 2021 The Author. Published by Elsevier Inc. All rights reserved.)

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