期刊
ISCIENCE
卷 24, 期 1, 页码 -出版社
CELL PRESS
DOI: 10.1016/j.isci.2020.101895
关键词
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资金
- Volkswagen Foundation [91067-9]
- LOEWE (FCI)
- Deutsche Forschungsgemeinschaft [KN498/12-1]
This study introduces a simple and efficient CRISPR/Cas12a technology for tagging endogenous proteins with photoactivatable protein, enabling quantitative SMLM and single-particle tracking. By using this technology, a cell line with MET receptor tyrosine kinase tagged was constructed, revealing the oligomeric state transition of MET and the mobility of single receptors. The combination of CRISPR/Cas12a-assisted endogenous protein labeling and super-resolution microscopy represents a powerful tool for cell biological research with molecular resolution.
Single-molecule localization microscopy (SMLM) reports on protein organization in cells with near-molecular resolution and in combination with stoichiometric labeling enables protein counting. Fluorescent proteins allow stoichiometric labeling of cellular proteins; however, most methods either lead to overexpression or are complex and time demanding. We introduce CRISPR/Cas12a for simple and efficient tagging of endogenous proteins with a photoactivatable protein for quantitative SMLM and single-particle tracking. We constructed a HEK293T cell line with the receptor tyrosine kinase MET tagged with mEos4b and demonstrate full functionality. We determine the oligomeric state of MET with quantitative SMLM and find a reorganization from monomeric to dimeric MET upon ligand stimulation. In addition, we measured the mobility of single MET receptors in vivo in resting and ligand-treated cells. The combination of CRISPR/Cas12a-assisted endogenous protein labeling and super-resolution microscopy represents a powerful tool for cell biological research with molecular resolution.
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