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MTV proteins unveil ER- and microtubule-associated compartments in the plant vacuolar trafficking pathway

Delgadillo, María Otilia and Ruano, Guillermo and Zouhar, Jan and Sauer, Michael and Shen, Jinbo and Lazarova, Aleksandra and Sanmartín, Maite and Lai, Louis Tung Faat and Deng, Cesi and Wang, Pengwei and Hussey, Patrick J. and Sánchez-Serrano, José Juan and Jiang, Liwen and Rojo, Enrique (2020) 'MTV proteins unveil ER- and microtubule-associated compartments in the plant vacuolar trafficking pathway.', Proceedings of the National Academy of Sciences of the United States of America., 117 (18). pp. 9884-9895.


The factors and mechanisms involved in vacuolar transport in plants, and in particular those directing vesicles to their target endomembrane compartment, remain largely unknown. To identify components of the vacuolar trafficking machinery, we searched for Arabidopsis modified transport to the vacuole (mtv) mutants that abnormally secrete the synthetic vacuolar cargo VAC2. We report here on the identification of 17 mtv mutations, corresponding to mutant alleles of MTV2/VSR4, MTV3/PTEN2A MTV7/EREL1, MTV8/ARFC1, MTV9/PUF2, MTV10/VPS3, MTV11/VPS15, MTV12/GRV2, MTV14/GFS10, MTV15/BET11, MTV16/VPS51, MTV17/VPS54, and MTV18/VSR1. Eight of the MTV proteins localize at the interface between the trans-Golgi network (TGN) and the multivesicular bodies (MVBs), supporting that the trafficking step between these compartments is essential for segregating vacuolar proteins from those destined for secretion. Importantly, the GARP tethering complex subunits MTV16/VPS51 and MTV17/VPS54 were found at endoplasmic reticulum (ER)- and microtubule-associated compartments (EMACs). Moreover, MTV16/VPS51 interacts with the motor domain of kinesins, suggesting that, in addition to tethering vesicles, the GARP complex may regulate the motors that transport them. Our findings unveil a previously uncharacterized compartment of the plant vacuolar trafficking pathway and support a role for microtubules and kinesins in GARP-dependent transport of soluble vacuolar cargo in plants.

Item Type:Article
Full text:(AM) Accepted Manuscript
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Date accepted:17 March 2020
Date deposited:02 June 2020
Date of first online publication:22 April 2020
Date first made open access:22 October 2020

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