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Quasi-elastic light scattering (QELS) is applied to investigate the effect ofthe tropomyosin/troponin complex (Tm/Tn) on the stiffness of actin filaments.The importance of hydrodynamic screening in semidilute solutions isdemonstrated. A new concentration dependent expression for the dynamicstructure factor $g(\bm k,t)$ of semiflexible polymers in semidilute solutionsis used to analyze the experimental QELS data. A concentration independentvalue for the bending modulus $\kappa$ is thus obtained. It increases by 50\%as a consequence of Tm/Tn binding in a 7:1:1 molar ratio of actin/Tm/Tn. Inaddition a new expression for the initial slope of the dynamic structure factorof a semiflexible polymer is used to determine the effective hydrodynamicdiameter of the actin filament. Our results confirm the general relevance ofthe concept of (intrinsic) semiflexibility to polymer dynamics.Comment: 9 pages, RevTeX, 9 figures, all uuencoded gzipe

macromolecules

Dynamic Light Scattering from Semidilute Actin Solutions: A Study of Hydrodynamic Screening, Filament Bending Stiffness, and the Effect of Tropomyosin/Troponin-Binding