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• W2083417939 abstract "The interaction of troponin molecules on the thin filament with Ca2+ plays a key role in regulating muscle contraction. To characterize the structural changes of troponin caused by Ca2+ and crossbridge formation, we recorded the small-angle x-ray intensity and the myoplasmic free Ca2+ concentration using fluo-3 AM in the same frog skeletal muscle during twitch elicited by a single electrical pulse at 16°C. In an overstretched muscle, the intensity of the meridional reflection from troponin at 1/38.5 nm−1 began to change at 4 ms after the stimulus, reached a peak at 10 ms, and returned to the resting level with a halftime of 25 ms. The concentration of troponin-bound Ca2+ began to increase at 1–2 ms after the stimulus, reached a peak at 5 ms, and returned to the resting level with a halftime of 40 ms, indicating that troponin begins to change conformation only after a sizable amount of Ca2+ has bound to it, and returns to the resting structure even when there is still some bound Ca2+. In a muscle with a filament overlap, crossbridge formation appears to slow down Ca2+ release from troponin and have a large effect on its conformation." @default.
• W2083417939 created "2016-06-24" @default.
• W2083417939 creator A5018483373 @default.
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• W2083417939 date "2010-07-01" @default.
• W2083417939 modified "2023-10-16" @default.
• W2083417939 title "Monitoring the Structural Behavior of Troponin and Myoplasmic Free Ca2+ Concentration during Twitch of Frog Skeletal Muscle" @default.
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• W2083417939 doi "https://doi.org/10.1016/j.bpj.2010.04.021" @default.
• W2083417939 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2895389" @default.
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