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• W82303313 abstract "We previously determined the binding constants of ADP, adenylyl imidodiphosphate (AMP-PNP), and inorganic pyrophosphate (PPi) to acto . myosin subfragment 1 (acto X S-1) by measuring the dissociation of acto X S-1 as a function of ATP analog concentration (Greene, L.E., and Eisenberg, E. (1980) J. Biol. Chem. 255, 543-548). In the present study, we reinvestigated this question by measuring the extent to which these ATP analogs inhibit the acto X S-1 ATPase activity using both cross-linked actin X S-1 and non-cross-linked proteins. No significant difference was found between the cross-linked and non-cross-linked acto X S-1 complexes in their affinity for either ADP or AMP-PNP. The binding constant of ADP to acto X S-1 determined by the inhibition method was in excellent agreement with that obtained previously by the dissociation method, both techniques giving values of about 7 X 10(3) M-1. However, this was not the case for AMP-PNP and PPi, with the inhibition method giving about 10-fold weaker binding constants than those determined previously by the dissociation method. Upon redoing our dissociation experiments over a wider range of actin concentrations than we used previously, we now find that the dissociation method gives much weaker values for the binding constants of PPi and AMP-PNP to acto X S-1, i.e. values on the order of 4 X 10(2) M-1. The very weak binding of these ATP analogs to acto X S-1 makes it difficult to obtain these values with great accuracy. Nevertheless, they seem to be in good agreement with the binding constants determined by the inhibition method. The weak binding of AMP-PNP and PPi to acto X S-1 is consistent with the recent fiber studies of Pate and Cooke (Pate, E., and Cooke, R. (1985) Biophys. J. 47, 773-780) and Schoenberg and Eisenberg (Schoenberg, M., and Eisenberg, E. (1986) Biophys. J. 48, 863-872)." @default.
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• W82303313 date "1986-07-01" @default.
• W82303313 modified "2023-09-30" @default.
• W82303313 title "Binding of ADP and ATP analogs to cross-linked and non-cross-linked acto X S-1." @default.
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• W82303313 doi "https://doi.org/10.1016/s0021-9258(18)67584-2" @default.
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