Overexpression of FAB1A-GFP recruits SNX2b on the endosome membrane in snx1-1 mutant in Arabidopsis.
PLANT SIGNALING & BEHAVIOR 2016;
11:e1110663. [PMID:
26515455 PMCID:
PMC4871638 DOI:
10.1080/15592324.2015.1110663]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2015] [Revised: 10/15/2015] [Accepted: 10/16/2015] [Indexed: 06/05/2023]
Abstract
Phosphatidylinositol 3,5-bisphosphate [PI(3,5)P2] is one of the phosphoinositides that controls endosomal trafficking events in eukaryotes. PtdIns(3,5)P2 is produced from PI(3)P by phosphatidylinositol 3-phosphate 5-kinase FAB1/PIKfyve. Recently, we reported that FAB1 predominantly localizes on the SNX1-residing late endosomes and a loss-of FAB1 function causes the release of late endosomal effector proteins, ARA7/RABF2b and SORTING NEXIN 1 from the endosome membrane, indicating that FAB1 or its product PtdIns(3,5)P2 mediates the maturation process of the late endosomes. Intriguingly, the ectopic expression of FAB1A could complement the sucrose-dependent seedling growth phenotype of snx1-1 mutant. Here, we demonstrated that the depletion of SNX1 causes the release of SNX2b-mRFP from the endosomal membrane. However, overexpression of FAB1A-GFP reassembles SNX2b-mRFP on the endosomal membrane despite the absence of SNX1. From these results, we proposed that SNX2b homodimer or SNX2a/SNX2b heterodimer might function as functional Sorting Nexin complex instead of SNX1 to attach the endosomal membrane by binding of overproduced PI(3,5)P2 in Arabidopsis.
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