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• W1549127727 abstract "Abstract Electron microscopy studies have shown that the structure of the complex of myosin subfragment 1 (S-1) cross-linked to actin with 1-ethyl-3-[3-(dimethyl-amino) propyl] carbodiimide is very different in the presence and absence of ATP (Craig, R., Greene, L. E., and Eisenberg, E. (1985) Proc. Natl. Acad. Sci. U. S. A. 82, 3247-3251). More recent studies have found that the structure of the cross-linked complex between S-1 modified extensively with N-ethylmaleimide (NEM.S-1) and actin resembles that of the rigor complex both in the presence and absence of ATP, whereas the structure of the cross-linked complex between S-1 modified with N',N'-p-phenylenedimaleimide (pPDM.S-1) and actin resembles that of the cross-linked actin.S-1 complex in the presence of ATP. In the present study, we have obtained biochemical evidence supporting these results. The conformation of the different cross-linked actin.S-1 complexes was determined by studying their effect on the troponin-tropomyosin-actin complex (regulated actin). The basis of this probe for conformation is that S-1.ATP, which is in the weak-binding conformation, interacts very differently with regulated actin than S-1 or S-1.ADP, which are in the strong-binding conformation. We find that both in the presence and absence of ATP, cross-linked NEM.S-1 appears to be in the strong-binding conformation, whereas cross-linked pPDM.S-1 appears to be shifted toward the weak-binding conformation. In contrast, cross-linked unmodified S-1 appears to be in the strong-binding conformation in the presence of ADP and the weak-binding conformation in the presence of ATP. Therefore, in agreement with electron microscopy studies, the cross-linked actin.S-1 complex appears to be able to alternate between the weak-binding and strong-binding conformation during the cross-bridge cycle." @default.
• W1549127727 created "2016-06-24" @default.
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• W1549127727 date "1987-05-01" @default.
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• W1549127727 title "The conformation of cross-linked actin·S-1 in the presence and absence of ATP." @default.
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• W1549127727 doi "https://doi.org/10.1016/s0021-9258(18)45547-0" @default.
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