Abstract
Vesicle trafficking between the membrane-bound organelles in plant cells plays crucial roles in the precise transportation of various materials, and thus supports cell proliferation and cellular polarization. Conventionally, plant prevacuolar compartments (PVCs), identified as multivesicular bodies (MVBs), play important roles in both the secretory pathway as intermediate compartments and the endocytic pathway as late endosomes. In recent years, the PVC/MVBs have been proposed to play important roles in both protein vacuolar delivery and unconventional secretion, but several important questions on the new regulators and environmental cues that coordinate the PVC/MVB–organelle membrane interactions and their biological significances remain. In this review, we first summarize the identity and nature of the plant PVC/MVBs, and then we present an update on our current understanding on the interaction of PVC/MVBs with other organelles in the plant endomembrane system with focus on the vacuole, autophagosome, and plasma membrane (PM) in plant development and stress responses. Finally, we raise some open questions and present future perspectives in the study of PVC/MVB–organelle interactions and associated biological functions.
Highlights
All eukaryotic cells have a functionally interrelated endomembrane system, which is “connected” by types of vesicle-mediated movement of materials
Recent discoveries have revealed that the prevacuolar compartments (PVCs)/multivesicular bodies (MVBs) participate in multiple fusion processes related to autophagy or unconventional secretion
We need better ways to distinguish the PVC/MVBs from Late PVCs (Foresti et al, 2010) and to characterize the molecular steps and processes occurring in the maturation of the PVC/MVBs. (2) In yeast, after MVB– vacuole fusion, many of these proteins and lipids remain in the vacuole membrane while some are degraded in the vacuole lumen, and others may even be recycled (Suzuki and Emr, 2018)
Summary
State Key Laboratory of Subtropical Silviculture, Zhejiang A & F University, Hangzhou, China. Diverse Membrane Interaction Network for Plant Multivesicular Bodies: Roles in Proteins Vacuolar. Vesicle trafficking between the membrane-bound organelles in plant cells plays crucial roles in the precise transportation of various materials, and supports cell proliferation and cellular polarization. Plant prevacuolar compartments (PVCs), identified as multivesicular bodies (MVBs), play important roles in both the secretory pathway as intermediate compartments and the endocytic pathway as late endosomes. The PVC/MVBs have been proposed to play important roles in both protein vacuolar delivery and unconventional secretion, but several important questions on the new regulators and environmental cues that coordinate the PVC/MVB–organelle membrane interactions and their biological significances remain. We raise some open questions and present future perspectives in the study of PVC/MVB–organelle interactions and associated biological functions
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