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• W1999469923 abstract "Because myosin thick filaments form in the actin-rich cortex of nonmuscle cells, we have examined the role of Dictyostelium actin filaments in the assembly of Dictyostelium myosin (type II). Fluorescence energy transfer and light-scattering assembly assays indicate that self-association of Dictyostelium myosin into bipolar thick filaments is kinetically regulated by actin filament networks. Regulation is nucleotide dependent but does not require ATP hydrolysis. Myosin assembly is accelerated approximately 5-fold by actin filaments when either 1 mM ATP or 1 mM adenosine 5'-[beta,gamma-imido]triphosphate (AMP-P[NH]P) is present. However, actin filaments together with 1 mM ADP abolish myosin assembly. Accelerated assembly appears to require transient binding of myosin molecules to actin filaments before incorporation into thick filaments. Fluorescence energy-transfer assays demonstrate that myosin associates with actin filaments at a rate that is equivalent to the accelerated myosin assembly rate, evidence that myosin to actin binding is a rate-limiting step in accelerated thick filament formation. Actin filament networks are also implicated in regulation of thick filament formation, since fragmentation of F-actin networks by severin causes immediate cessation of accelerated myosin assembly. Electron microscopic studies support a model of actin filament-mediated myosin assembly. In ADP, myosin monomers rapidly decorate F-actin, preventing extensive formation of thick filaments. In AMP-P[NH]P, myosin assembles along actin filaments, forming structures that resemble primitive stress fibers. Taken together, these data suggest a model in which site-directed assembly of thick filaments in Dictyostelium is mediated by the interaction of myosin monomers with cortical actin filament networks." @default.
• W1999469923 created "2016-06-24" @default.
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• W1999469923 date "1989-08-01" @default.
• W1999469923 modified "2023-10-03" @default.
• W1999469923 title "Actin filaments mediate Dictyostelium myosin assembly in vitro." @default.
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• W1999469923 doi "https://doi.org/10.1073/pnas.86.16.6161" @default.
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