The Arabidopsis V-ATPase is localized to the TGN/EE via a seed plant-specific motif.
Elife
; 92020 11 25.
Article
em En
| MEDLINE
| ID: mdl-33236982
ABSTRACT
The V-ATPase is a versatile proton-pump found in a range of endomembrane compartments yet the mechanisms governing its differential targeting remain to be determined. In Arabidopsis, VHA-a1 targets the V-ATPase to the TGN/EE whereas VHA-a2 and VHA-a3 are localized to the tonoplast. We report here that the VHA-a1 targeting domain serves as both an ER-exit and as a TGN/EE-retention motif and is conserved among seed plants. In contrast, Marchantia encodes a single VHA-isoform that localizes to the TGN/EE and the tonoplast in Arabidopsis. Analysis of CRISPR/Cas9 generated null alleles revealed that VHA-a1 has an essential function for male gametophyte development but acts redundantly with the tonoplast isoforms during vegetative growth. We propose that in the absence of VHA-a1, VHA-a3 is partially re-routed to the TGN/EE. Our findings contribute to understanding the evolutionary origin of V-ATPase targeting and provide a striking example that differential localization does not preclude functional redundancy.
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MEDLINE
Assunto principal:
Regulação Enzimológica da Expressão Gênica
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Arabidopsis
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Regulação da Expressão Gênica de Plantas
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ATPases Vacuolares Próton-Translocadoras
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Proteínas de Arabidopsis
Idioma:
En
Ano de publicação:
2020
Tipo de documento:
Article