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• W1571679969 abstract "Small angle neutron scattering has been used to study the dimensions of G-actin and the formation of low molecular weight actin oligomers under conditions where rapid polymerization does not take place. In the presence of 200 microM Ca2+, actin in solution consists of a single component with a radius of gyration (Rg) of 19.9 +/- 0.4 A, consistent with the known molecular dimensions of the G-actin molecule. In the presence of 50 microM Mg2+, however, formation of an actin species with a larger Rg occurs over a 4-h period. Multicomponent fits were tried and the data were best fit assuming two components, the monomer and a species with an Rg of 29 +/- 1 A. This latter value is consistent with the dimensions expected for certain actin dimers. The apparent dissociation constant for dimer formation is approximately 150 microM with forward and reverse rate constants of 6.0 X 10(-7) microM-1 s-1 and 8.8 X 10(-5) s-1, respectively. Kinetic fluorescence experiments show that the dimer formed in the presence of low levels of Mg2+ is a nonproductive complex which does not participate in the polymerization process. However, the addition of cytochalasin D to actin in the presence of 50 microM Mg2+ rapidly induces the formation of dimers, presumably related to cytochalasin's ability to nucleate actin polymerization." @default.
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• W1571679969 date "1986-02-01" @default.
• W1571679969 modified "2023-09-27" @default.
• W1571679969 title "Formation of actin dimers as studied by small angle neutron scattering." @default.
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• W1571679969 doi "https://doi.org/10.1016/s0021-9258(17)35830-1" @default.
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