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- W1990744692 abstract "The ability of a localized conformational searching method to predict probe orientation was tested on model nucleic acid and protein structures and applied to the prediction of skeletal myosin integrity upon chemical modification of its reactive thiols. Double-stranded oligonucleotides were chemically labeled with donor and acceptor resonance energy transfer probes at each end for distance determinations. These measurements were made independently using a terbium chelate as a donor to each of four chemically and spectroscopically distinct acceptor probes from the xanthene and cyanine dye groups. The choice of acceptor significantly affected the separation distance measured. Conformational searching algorithms on the atomic model corrected for the differences to within 0.2 nm on average. Verifying its usefulness on proteins, the localized conformational searching method determined the orientation of a fluorescent probe on RNase A that corresponds closely to available crystallographic models of the labeled protein (RMS deviation = 0.1 nm). Also, analysis of the symmetry of the fluorophores' structures suggests why FRET orientation factors are often closer to their dynamic average value than might normally be expected. Furthermore, the computational method provides insights about FRET data that are important for assessing the stability of the α-helix separating the SH1 and SH2 reactive thiols in skeletal myosin." @default.
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- W1990744692 date "1999-08-01" @default.
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- W1990744692 title "Determination of Fluorescent Probe Orientations on Biomolecules by Conformational Searching: Algorithm Testing and Applications to the Atomic Model of Myosin" @default.
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- W1990744692 doi "https://doi.org/10.1006/jsbi.1999.4127" @default.
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