RRC ID 54613
Author Ravikumar R, Kalbfuß N, Gendre D, Steiner A, Altmann M, Altmann S, Rybak K, Edelmann H, Stephan F, Lampe M, Facher E, Wanner G, Falter-Braun P, Bhalerao RP, Assaad FF.
Title Independent yet overlapping pathways ensure the robustness and responsiveness of trans-Golgi network functions in Arabidopsis.
Journal Development
Abstract The trans-Golgi-network (TGN) has essential housekeeping functions in secretion, endocytosis and protein sorting, but also more specialized functions in plant development. How the robustness of basal TGN function is ensured while specialized functions are differentially regulated is poorly understood. Here, we investigate two key regulators of TGN structure and function, ECHIDNA and the Transport Protein Particle II (TRAPPII) tethering complex. An analysis of physical, network and genetic interactions suggests that two network communities are implicated in TGN function and that ECHIDNA and TRAPPII belong to distinct yet overlapping pathways. Whereas ECHIDNA and TRAPPII colocalized at the TGN in interphase cells, their localization diverged in dividing cells. Moreover, ECHIDNA and TRAPPII localization patterns were mutually independent. TGN structure, endocytosis and sorting decisions were differentially impacted in echidna and trappii mutants. Our analyses point to a partitioning of specialized TGN functions, with ECHIDNA being required for cell elongation and TRAPPII for cytokinesis. Two independent pathways able to compensate for each other might contribute to the robustness of TGN housekeeping functions and to the responsiveness and fine tuning of its specialized functions.
Volume 145(21)
Published 2018-11-7
DOI 10.1242/dev.169201
PII 145/21/dev169201
PMID 30404777
MeSH Arabidopsis / cytology Arabidopsis / embryology Arabidopsis / metabolism* Arabidopsis / ultrastructure Arabidopsis Proteins / genetics Arabidopsis Proteins / metabolism Biomarkers / metabolism Cell Membrane / metabolism Cytokinesis Endocytosis Epistasis, Genetic Green Fluorescent Proteins / metabolism Hypocotyl / metabolism Hypocotyl / ultrastructure Mutation / genetics Plant Roots / metabolism Protein Transport Signal Transduction* trans-Golgi Network / metabolism* trans-Golgi Network / ultrastructure
IF 5.763
Times Cited 9
Arabidopsis / Cultured plant cells, genes pda