Abstract
Membrane associated proteins SNAREs (soluble N-ethylmaleimide-sensitive fusion protein attachment protein receptors) provide the minimal fusion machinery necessary for cellular vesicles to fuse to target organelle membranes in eukaryotic cells. Despite the conserved nature of the fusion machinery in all eukaryotes, it still remains challenging to identify functional SNARE pairs in higher plants. We developed a method based on a split-luciferase complementation assay for detecting changes in SNARE–SNARE interaction by luminescence within Arabidopsis protoplasts that express recombinant proteins at physiological levels in 96-well plates. The reliability of the assay was confirmed by three experiments. First, reduction of the SNARE–SNARE interaction caused by a single amino acid substitution adjacent to the SNARE motif in endosome-localized AtVAM3/SYP22 (syntaxin of plant 22) was detected by a reduction of luminescence. Second, reduction of the interaction between plasma-membrane localized SYP121 and VAMP722 in response to sodium azide was detected in real-time. Third, the results of 21 SNARE pairs investigated by this method largely agreed with the results from previously reported co-immunoprecipitation assays. Using the method, we newly identified the interaction between SYP121 and VAMP722 was significantly increased when the protoplasts were incubated in the light. Microscopic observation of transgenic Arabidopsis expressing GFP–SYP121 (green fluorescent protein tagged SYP121) from its own promoter suggested that the plasma-membrane localization of GFP–SYP121 is maintained by light. These suggested that the vesicle trafficking pathway mediated by SYP121 might be regulated by light in Arabidopsis. In general, this article demonstrated the method that can generate new biological insight of the SNARE protein interactions in plant cells.
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Acknowledgments
The project was supported by the USDA Cooperative State Research, Education and Extension Service—National Research Initiative—Plant Genome Program, award no. 2006-35604-16627, for N.K. The project described was partially supported by Grant Number P20RR016456 from the National Center For Research Resources. The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Center For Research Resources or the National Institutes of Health. N.K. thanks Drs. Emily McMains and John Larkin for their critical reading of the manuscript.
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Kato, N., Fujikawa, Y., Fuselier, T. et al. Luminescence detection of SNARE–SNARE interaction in Arabidopsis protoplasts. Plant Mol Biol 72, 433–444 (2010). https://doi.org/10.1007/s11103-009-9581-z
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DOI: https://doi.org/10.1007/s11103-009-9581-z