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Erratum: "The polymerization of actin: Structural changes from small-angle neutron scattering" [J. Chem. Phys. 123, 154904 (2005)].

In 2005, we reported on the analysis of small angle neutron scattering (SANS) from rabbit muscle actin in D 2 O bu ff er, in the presence of ATP and of KCl (which initiates the polymerization into F-actin). 1 That analysis found the unpolymerized G-actin molecules to have the shape of polydisperse spheres. We have reconsidered that data analysis and we now find that the data do exclude the shape of a simple monodisperse sphere, but that the data do not distinguish between a polydisperse sphere and an oblate ellipsoid. The oblate ellipsoidal shape found for G-actin in KCl solution in D 2 O is 16% more elongated than is the molecular shape found in crystalline forms of G-actin. 2–4 The model for the oblate ellipsoid that was available in 2005 from the National Institute of Standards and Technology Center for Neutron Research (NIST-CNR) allowed for only two ellipsoidal axes. We had fixed the dimensions of the two axes to match those found in studies of G-actin in the crystalline form: diameters of 55