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Viruses 2018, 10(11), 585; https://doi.org/10.3390/v10110585

The Interaction Dynamics of Two Potato Leafroll Virus Movement Proteins Affects Their Localization to the Outer Membranes of Mitochondria and Plastids

1
United States Department of Agriculture, Biological Integrated Pest Management Research Unit, Robert W. Holley Center for Agriculture and Health, 538 Tower Road, Ithaca, NY 14853, USA
2
Boyce Thompson Institute for Plant Research, Ithaca, NY 14853, USA
3
Section of Plant Pathology and Plant-Microbe Biology, School of Integrated Plant Science, Cornell University, Ithaca, NY 14853, USA
4
Department of Genome Sciences, University of Washington, Seattle WA 98109, USA
*
Author to whom correspondence should be addressed.
Received: 21 August 2018 / Revised: 19 October 2018 / Accepted: 19 October 2018 / Published: 26 October 2018
(This article belongs to the Special Issue Plant-Virus Interactions)
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Abstract

The Luteoviridae is an agriculturally important family of viruses whose replication and transport are restricted to plant phloem. Their genomes encode for four proteins that regulate viral movement. These include two structural proteins that make up the capsid and two non-structural proteins known as P3a and P17. Little is known about how these proteins interact with each other and the host to coordinate virus movement within and between cells. We used quantitative, affinity purification-mass spectrometry to show that the P3a protein of Potato leafroll virus complexes with virus and that this interaction is partially dependent on P17. Bimolecular complementation assays (BiFC) were used to validate that P3a and P17 self-interact as well as directly interact with each other. Co-localization with fluorescent-based organelle markers demonstrates that P3a directs P17 to the mitochondrial outer membrane while P17 regulates the localization of the P3a-P17 heterodimer to plastids. Residues in the C-terminus of P3a were shown to regulate P3a association with host mitochondria by using mutational analysis and also varying BiFC tag orientation. Collectively, our work reveals that the PLRV movement proteins play a game of intracellular hopscotch along host organelles to transport the virus to the cell periphery. View Full-Text
Keywords: Potato leafroll virus; plant pathogen; phloem-limited; movement protein; viral trafficking; Luteoviridae; polerovirus; insect-borne; endomembrane system Potato leafroll virus; plant pathogen; phloem-limited; movement protein; viral trafficking; Luteoviridae; polerovirus; insect-borne; endomembrane system
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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DeBlasio, S.L.; Xu, Y.; Johnson, R.S.; Rebelo, A.R.; MacCoss, M.J.; Gray, S.M.; Heck, M. The Interaction Dynamics of Two Potato Leafroll Virus Movement Proteins Affects Their Localization to the Outer Membranes of Mitochondria and Plastids. Viruses 2018, 10, 585.

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