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- W2034686773 abstract "Direct measurements were made of the Ca distribution within sarcomeres of glycerinated rabbit psoas muscle fibers in rigor using electron probe x-ray microanalysis. Both analogue raster analysis and digital x-ray imaging were used to quantitate the Ca distribution along thick and thin filaments as a function of the concentration of free Ca2+. Even when corrected for the estimated contribution of Ca bound to thick filaments, the Ca measured in the region of overlap between thick and thin filaments significantly exceeded the Ca in the I-band at subsaturating concentrations of free Ca2+. At saturating levels of free Ca2+, the excess Ca in the overlap region was diminished but still statistically significant. The data thus suggest that the formation of rigor linkages exerts multiple effects on the binding of Ca2+ to thin filaments in the overlap region by increasing the affinity of troponin C for Ca2+ and possibly by unmasking additional Ca2+ binding sites. The data also show that the cooperativity invested in the thin filaments is insufficient to permit the effects of rigor cross-bridge formation on Ca2+ binding to propagate far along the thin filaments into the I-band." @default.
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- W2034686773 date "1993-01-01" @default.
- W2034686773 modified "2023-10-16" @default.
- W2034686773 title "Subsarcomeric distribution of calcium in demembranated fibers of rabbit psoas muscle" @default.
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- W2034686773 doi "https://doi.org/10.1016/s0006-3495(93)81358-4" @default.
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