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Structure‐guided design of a reversible fluorogenic reporter of protein‐protein interactions
Author(s) -
To TszLeung,
Zhang Qiang,
Shu Xiaokun
Publication year - 2016
Publication title -
protein science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.353
H-Index - 175
eISSN - 1469-896X
pISSN - 0961-8368
DOI - 10.1002/pro.2866
Subject(s) - bimolecular fluorescence complementation , fluorescence , green fluorescent protein , chemistry , fluorescent protein , protein–protein interaction , biophysics , protein engineering , reporter gene , chromophore , biochemistry , chemical biology , enzyme , biology , gene , photochemistry , physics , gene expression , quantum mechanics
A reversible green fluorogenic protein‐fragment complementation assay was developed based on the crystal structure of UnaG, a recently discovered fluorescent protein. In living mammalian cells, the nonfluorescent fragments complemented and rapidly became fluorescent upon rapamycin‐induced FKBP and Frb protein interaction, and lost fluorescence when the protein interaction was inhibited. This reversible fluorogenic reporter, named uPPI [UnaG‐based protein‐protein interaction (PPI) reporter], uses bilirubin (BR) as the chromophore and requires no exogenous cofactor. BR is an endogenous molecule in mammalian cells and is not fluorescent by itself. uPPI may have many potential applications in visualizing spatiotemporal dynamics of PPIs.