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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, R.P.* ; Assaad, F.F.*

Independent yet overlapping pathways ensure the robustness and responsiveness of trans-Golgi network functions in Arabidopsis.

Development 145:dev169201 (2018)
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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.
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Publication type Article: Journal article
Document type Scientific Article
Keywords Tgn ; Echidna ; Trappii ; Network Interactions ; Sorting ; Cytokinesis; Cell-wall Polysaccharides; Secretory Trafficking; Rab Gtpase; Protein; Cytokinesis; Membrane; Trappii; Colocalization; Dynamics; Complex
ISSN (print) / ISBN 0950-1991
e-ISSN 1477-9129
Quellenangaben Volume: 145, Issue: 21, Pages: , Article Number: dev169201 Supplement: ,
Publisher Company of Biologists
Publishing Place Bidder Building, Station Rd, Histon, Cambridge Cb24 9lf, England
Reviewing status Peer reviewed
Institute(s) Institute of Network Biology (INET)