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• W2091219790 abstract "Abstract We report a functional characterization of AtVPS45 (for vacuolar protein sorting 45), a protein from the Sec1/Munc18 family in Arabidopsis (Arabidopsis thaliana) that interacts at the trans-Golgi network (TGN) with the SYP41/SYP61/VTI12 SNARE complex. A null allele of AtVPS45 was male gametophytic lethal, whereas stable RNA interference lines with reduced AtVPS45 protein levels had stunted growth but were viable and fertile. In the silenced lines, we observed defects in vacuole formation that correlated with a reduction in cell expansion and with autophagy-related defects in nutrient turnover. Moreover, transport of vacuolar cargo with carboxy-terminal vacuolar sorting determinants was blocked in the silenced lines, suggesting that AtVPS45 functions in vesicle trafficking to the vacuole. These trafficking defects are similar to those observed in vti12 mutants, supporting a functional relationship between AtVPS45 and VTI12. Consistent with this, we found a decrease in SYP41 protein levels coupled to the silencing of AtVPS45, pointing to instability and malfunction of the SYP41/SYP61/VTI12 SNARE complex in the absence of its cognate Sec1/Munc18 regulator. Based on its localization on the TGN, we hypothesized that AtVPS45 could be involved in membrane fusion of retrograde vesicles recycling vacuolar trafficking machinery. Indeed, in the AtVPS45-silenced plants, we found a striking alteration in the subcellular fractionation pattern of vacuolar sorting receptors, which are required for sorting of carboxy-terminal vacuolar sorting determinant-containing cargo. We propose that AtVPS45 is essential for recycling of the vacuolar sorting receptors back to the TGN and that blocking this step underlies the defects in vacuolar cargo trafficking observed in the silenced lines." @default.
• W2091219790 created "2016-06-24" @default.
• W2091219790 creator A5032410777 @default.
• W2091219790 creator A5036941942 @default.
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• W2091219790 date "2009-02-27" @default.
• W2091219790 modified "2023-09-26" @default.
• W2091219790 title "AtVPS45 Is a Positive Regulator of the SYP41/SYP61/VTI12 SNARE Complex Involved in Trafficking of Vacuolar Cargo " @default.
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• W2091219790 doi "https://doi.org/10.1104/pp.108.134361" @default.
• W2091219790 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2663731" @default.
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• W2091219790 hasPublicationYear "2009" @default.
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