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pubmed-article:15474505pubmed:abstractTextDual color fluorescence cross-correlation spectroscopy (FCCS) provides information about the coincidence of spectrally well-defined two fluorescent molecules in a small observation area at the single-molecule level. To evaluate the activity of caspase-3 in vivo directly, FCCS was applied to single live cells. We constructed chimeric proteins that consisted of tandemly fused enhanced green FP (EGFP) and monomeric red FP (mRFP). In control experiments, the protease reaction was monitored in solution, where a decrease in cross-correlation amplitude was observed due to specific cleavage of the amino acid sequence between EGFP and mRFP. Moreover, a decrease in cross-correlation amplitude could be detected in a live cell, where caspase-3 activation was induced by apoptosis. This is the first report of FP-based in vivo cross-correlation analysis. FP-based FCCS may become the most versatile method for analysis of protein-protein interactions in live cells.lld:pubmed
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pubmed-article:15474505pubmed:authorpubmed-author:KinjoMasataka...lld:pubmed
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pubmed-article:15474505pubmed:articleTitleDirect detection of caspase-3 activation in single live cells by cross-correlation analysis.lld:pubmed
pubmed-article:15474505pubmed:affiliationLaboratory of Supramolecular Biophysics, Research Institute for Electronic Science, Hokkaido University, N12W6, Kita-ku, Sapporo 060-0812, Japan.lld:pubmed
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