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Updated: Feb 8, 2026
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Identification of Plasmodesmal Localization Sequences in Proteins In Planta
Published on: August 15, 2017
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The Plasmodesmal Localization Signal of TMV MP Is Recognized by Plant Synaptotagmin SYTA
Cheng Yuan1,2, Sondra G Lazarowitz1,3, Vitaly Citovsky4
1Department of Biochemistry and Cell Biology, State University of New York, Stony Brook, New York, USA.
Mbio
|July 12, 2018
Summary
Plant viruses use movement proteins (MPs) to spread between cells. Researchers found that the Tobacco mosaic virus (TMV) MP uses a specific signal to target plasmodesmata, interacting with the host protein SYTA for cell-to-cell movement.
Area of Science:
- Plant virology
- Molecular plant-pathogen interactions
- Cell biology
Background:
- Plant viruses encode movement proteins (MPs) to facilitate cell-to-cell transport through plasmodesmata.
- The precise mechanisms of MP targeting to plasmodesmata and host recognition are not fully understood.
- The plasmodesmal localization signal (PLS) of Tobacco mosaic virus (TMV) MP was recently identified.
Purpose of the Study:
- To identify host factors that recognize the TMV MP PLS.
- To investigate the role of Arabidopsis synaptotagmin A (SYTA) in TMV MP targeting to plasmodesmata.
- To elucidate the interaction between TMV PLS and SYTA.
Main Methods:
- In planta bimolecular fluorescence complementation (BiFC) assays.
- Yeast two-hybrid assays.
- Analysis of TMV MP plasmodesmal targeting in Arabidopsis syta knockdown lines.
Main Results:
- The TMV PLS directly interacted with SYTA.
- The PLS sequence was both necessary and sufficient for SYTA interaction.
- TMV MP plasmodesmal targeting was significantly reduced in Arabidopsis syta knockdown plants.
Conclusions:
- SYTA recognizes the TMV MP PLS, acting as a host factor for plasmodesmal targeting.
- The interaction between TMV MP PLS and SYTA is crucial for efficient TMV cell-to-cell movement.
- This study highlights the importance of host protein recognition in viral transport through plasmodesmata.
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