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• W2014113999 abstract "The distance between the regulatory light chains of the two heads of the scallop myosin molecule was estimated with the aid of two photolabile cross-linkers, benzophenone maleimide and p-azidophenacylbromide. These cross-linkers selectively alkylate thiol groups and have a maximum length of about 9 Å. One of the two regulatory light chains of scallop myosin was removed by treatment of myofibrils at 10 °C with EDTA and replaced with a foreign regulatory light chain carrying a cross-linker. Cross-linking between the scallop and foreign regulatory light chains was effected by photolysis. This was demonstrated by incubating nitrocellulose transfers of sodium dodecyl sulfate/polyacrylamide gels of the photolyzed hybrid myofibrils with specific antibodies against the different light chains, followed by fluorescein isothiocyanate-125I-labeled secondary antibody. Scallop regulatory light chains cross-linked extensively (20 to 50%) with Mercenaria regulatory light chains (cysteine in position ~50) in solutions that induce rigor in skinned fibers (no ATP) and in relaxing solutions (ATP but no Ca2+). Neither the regulatory light chains of chicken skeletal myosin (cysteines 129 and 157) nor those of gizzard myosin (cysteine 108) were cross-linked to scallop regulatory light chains in either medium. These results indicate that the N-terminal portions of the myosin regulatory light chains can approach each other within 9 Å or less, while the distance between the C-terminal halves exceeds 9 Å, and support the view that the N termini of the regulatory light chains point toward the myosin rod. Since the relative distance between the regulatory light chains of the two myosin heads is not altered between rigor and rest, we suggest that motion of the essential light chains is mainly responsible for the observed difference in the relative positions of the regulatory and essential light chains between conditions of rigor and rest." @default.
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• W2014113999 title "Proximity of regulatory light chains in scallop myosin" @default.
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• W2014113999 doi "https://doi.org/10.1016/0022-2836(85)90213-x" @default.
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