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AtSYP51/52 Functions Diverge in the Post-Golgi Traffic and Differently Affect Vacuolar Sorting

Molecular Plant 2013年第3期6卷 916-930页

作者： Maria De Benedictis Gianluca Bleve Marianna Faraco Egidio Stigliano Francesco Grieco Gabriella Piro Giuseppe Dalessandro Gian Pietro Di Sansebastiano Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali University of Salento Campus Ecotekne 73100 Lecce Italy Present address: Dipartimento di Bioscienze Universita degli Studi di Parma Parco Area delle Scienze 11/A 43124 Parma Italy institute of Science of Food Production National Research Council via Provinciale Lecce-Monteroni 73100 Lecce Italy Laboratory of Cell and Molecular Biology University of Neuchatel Rue Emile-Argand 11 CP 158 2009 Neuchatel Switzerland

Plant sensitive factor attachment protein receptors （snares） encoded by genes of the same sub-family are generally considered as redundant in promoting vesicle-associated membrane fusion events. Nonetheless, the application of innovative experimental approaches highlighted that members of the same gene sub-family often have different functional specificities. in this work, two closely related Qc-snares--the AtSYP51 and the AtSYP52--are compared in their ability to influence different secretory pathways. Their role in the vesicle sorting to the central vacuole has been revised and they were found to have a novel inhibitory function. When transiently overexpressed, the SYP51 and the SYP52 distributed between the TGN and the tonoplast. Our data demonstrate that these SYPs （syntaxin of plants） act as t-snare when present on the membrane of TGN/PVC, whereas they behave as inhibitory or interfering snares （i-snares） when they accumulate on the tonoplast. Moreover, the performed functional analysis indicated that the AtSYP51 and the AtSYP52 roles differ in the traffic to the vacuole. The findings are a novel contribution to the functional characterization of plant snares that reveals additional non-fusogenic roles.

关键词： endocytosis endosome Golgi i-snare plant endomembranes protoplast snare TGN tonoplast vacuole.

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