Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 543784
Title Nonselective Chemical Inhibition of Sec7 Domain-Containing ARF GTPase Exchange Factors
Author(s) Mishev, Kiril; Lu, Qing; Denoo, Bram; Peurois, François; Dejonghe, Wim; Hullaert, Jan; Rycke, Riet De; Boeren, Sjef; Bretou, Marine; Munck, Steven De; Sharma, Isha; Goodman, Kaija; Kalinowska, Kamila; Storme, Veronique; Nguyen, Le Son Long; Drozdzecki, Andrzej; Martins, Sara; Nerinckx, Wim; Audenaert, Dominique; Vert, Grégory; Madder, Annemieke; Otegui, Marisa S.; Isono, Erika; Savvides, Savvas N.; Annaert, Wim; Vries, Sacco de; Cherfils, Jacqueline; Winne, Johan; Russinova, Eugenia
Source The Plant Cell 30 (2018)10. - ISSN 1040-4651 - p. 2573 - 2593.
Department(s) Biochemistry
Publication type Refereed Article in a scientific journal
Publication year 2018

Small GTP-binding proteins from the ADP-ribosylation factor (ARF) family are important regulators of vesicle formation and cellular trafficking in all eukaryotes. ARF activation is accomplished by a protein family of guanine nucleotide exchange factors (GEFs) that contain a conserved catalytic Sec7 domain. Here, we identified and characterized Secdin, a small-molecule inhibitor of Arabidopsis thaliana ARF-GEFs. Secdin application caused aberrant retention of plasma membrane (PM) proteins in late endosomal compartments, enhanced vacuolar degradation, impaired protein recycling, and delayed secretion and endocytosis. Combined treatments with Secdin and the known ARF-GEF inhibitor Brefeldin A (BFA) prevented the BFA-induced PM stabilization of the ARF-GEF GNOM, impaired its translocation from the Golgi to the trans-Golgi network/early endosomes, and led to the formation of hybrid endomembrane compartments reminiscent of those in ARF-GEF-deficient mutants. Drug affinity-responsive target stability assays revealed that Secdin, unlike BFA, targeted all examined Arabidopsis ARF-GEFs, but that the interaction was probably not mediated by the Sec7 domain because Secdin did not interfere with the Sec7 domain-mediated ARF activation. These results show that Secdin and BFA affect their protein targets through distinct mechanisms, in turn showing the usefulness of Secdin in studies in which ARF-GEF-dependent endomembrane transport cannot be manipulated with BFA.

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