Versatile protein tagging in cells with split fluorescent protein

Daichi Kamiyama, Sayaka Sekine, Benjamin Barsi-Rhyne, Jeffrey Hu, Baohui Chen, Luke A. Gilbert, Hiroaki Ishikawa, Manuel D. Leonetti, Wallace F. Marshall, Jonathan S. Weissman and Bo Huang ()
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Daichi Kamiyama: University of California
Sayaka Sekine: University of California
Benjamin Barsi-Rhyne: Tetrad Graduate Program, University of California
Jeffrey Hu: University of California
Baohui Chen: University of California
Luke A. Gilbert: University of California
Hiroaki Ishikawa: University of California
Manuel D. Leonetti: University of California
Wallace F. Marshall: University of California
Jonathan S. Weissman: University of California
Bo Huang: University of California

Nature Communications, 2016, vol. 7, issue 1, 1-9

Abstract: Abstract In addition to the popular method of fluorescent protein fusion, live cell protein imaging has now seen more and more application of epitope tags. The small size of these tags may reduce functional perturbation and enable signal amplification. To address their background issue, we adapt self-complementing split fluorescent proteins as epitope tags for live cell protein labelling. The two tags, GFP11 and sfCherry11 are derived from the eleventh β-strand of super-folder GFP and sfCherry, respectively. The small size of FP11-tags enables a cost-effective and scalable way to insert them into endogenous genomic loci via CRISPR-mediated homology-directed repair. Tandem arrangement FP11-tags allows proportional enhancement of fluorescence signal in tracking intraflagellar transport particles, or reduction of photobleaching for live microtubule imaging. Finally, we show the utility of tandem GFP11-tag in scaffolding protein oligomerization. These experiments illustrate the versatility of FP11-tag as a labelling tool as well as a multimerization-control tool for both imaging and non-imaging applications.

Date: 2016
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DOI: 10.1038/ncomms11046

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