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- W3048352105 abstract "Selective autophagy is a subcellular process whereby cytoplasmic materials are selectively sequestered into autophagosomes for subsequent delivery to the vacuole for degradation and recycling. Arabidopsis (Arabidopsis thaliana) NBR1 (next to BRCA1 gene 1 protein; AtNBR1) has been proposed to function as a selective autophagy receptor in plants, whereby AtNBR1 anchors the ubiquitinated targets to autophagosomes for degradation. However, the specific cargos of AtNBR1 remain elusive. We previously showed that Arabidopsis exocyst subunit EXO70 family protein E2 (AtExo70E2), a marker for exocyst-positive organelle (EXPO), colocalized with the autophagosome marker Arabidopsis autophagy-related protein8 (AtATG8) and was delivered to the vacuole for degradation upon autophagic induction. Here, through multiple analyses, we demonstrate that AtNBR1 is a selective receptor for AtExo70E2 during autophagy in Arabidopsis. First, two novel loss-of-function nbr1 CRISPR mutants (nbr1-c1 and nbr1-c2) showed an early-senescence phenotype under short-day growth conditions. Second, during autophagic induction, the vacuolar delivery of AtExo70E2 or EXPO was significantly reduced in nbr1 mutants compared to wild-type plants. Third, biochemical and recruitment assays demonstrated that AtNBR1 specifically interacted and recruited AtExo70E2 or its EXPO to AtATG8-positive autophagosomes in a ubiquitin-associated (UBA)-independent manner during autophagy. Taken together, our data indicate that AtNBR1 functions as a selective receptor in mediating vacuolar delivery of AtExo70E2 or EXPO in a UBA-independent manner in plant autophagy." @default.
- W3048352105 created "2020-08-13" @default.
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- W3048352105 date "2020-08-05" @default.
- W3048352105 modified "2023-10-13" @default.
- W3048352105 title "AtNBR1 Is a Selective Autophagic Receptor for AtExo70E2 in Arabidopsis" @default.
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- W3048352105 doi "https://doi.org/10.1104/pp.20.00470" @default.
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