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• W2805114958 abstract "We have used a novel time-resolved FRET (TR-FRET) assay to detect small-molecule modulators of actin-myosin structure and function. Actin-myosin interactions play crucial roles in the generation of cellular force and movement. Numerous mutations and post-translational modifications of actin or myosin disrupt muscle function and cause life-threatening syndromes. Here, we used a FRET biosensor to identify modulators that bind to the actin-myosin interface and alter the structural dynamics of this complex. We attached a fluorescent donor to actin at Cys-374 and a nonfluorescent acceptor to a peptide containing the 12 N-terminal amino acids of the long isoform of skeletal muscle myosin's essential light chain. The binding site on actin of this acceptor-labeled peptide (ANT) overlaps with that of myosin, as indicated by (a) a similar distance observed in the actin-ANT complex as in the actin-myosin complex and (b) a significant decrease in actin-ANT FRET upon binding myosin. A high-throughput FRET screen of a small-molecule library (NCC, 727 compounds), using a unique fluorescence lifetime readout with unprecedented speed and precision, showed that FRET is significantly affected by 10 compounds in the micromolar range. Most of these hits alter actin-activated myosin ATPase and affect the microsecond dynamics of actin detected by transient phosphorescence anisotropy. We conclude that the actin-ANT TR-FRET assay enables detection of pharmacologically active compounds that affect actin structural dynamics and actomyosin function. This assay establishes feasibility for the discovery of allosteric modulators of the actin-myosin interaction, with the ultimate goal of developing therapies for muscle disorders." @default.
• W2805114958 created "2018-06-13" @default.
• W2805114958 creator A5024934620 @default.
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• W2805114958 date "2018-08-01" @default.
• W2805114958 modified "2023-10-18" @default.
• W2805114958 title "High-throughput screen, using time-resolved FRET, yields actin-binding compounds that modulate actin–myosin structure and function" @default.
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• W2805114958 doi "https://doi.org/10.1074/jbc.ra118.002702" @default.
• W2805114958 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6078445" @default.
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