NDLI: Differences in Internal Dynamics of Actin under Different Structural States Detected by Neutron Scattering

Content Provider	PubMed Central
Author	Fujiwara, Satoru Marie, Plazanet Matsumoto, Fumiko Oda, Toshiro
Abstract	F-actin, a helical polymer formed by polymerization of the monomers (G-actin), plays crucial roles in various aspects of cell motility. Flexibility of F-actin has been suggested to be important for such a variety of functions. Understanding the flexibility of F-actin requires characterization of a hierarchy of dynamical properties, from internal dynamics of the actin monomers through domain motions within the monomers and relative motions between the monomers within F-actin to large-scale motions of F-actin as a whole. As a first step toward this ultimate purpose, we carried out elastic incoherent neutron scattering experiments on powders of F-actin and G-actin hydrated with D2O and characterized the internal dynamics of F-actin and G-actin. Well established techniques and analysis enabled the extraction of mean-square displacements and their temperature dependence in F-actin and in G-actin. An effective force constant analysis with a model consisting of three energy states showed that two dynamical transitions occur at ∼150 K and ∼245 K, the former of which corresponds to the onset of anharmonic motions and the latter of which couples with the transition of hydration water. It is shown that behavior of the mean-square displacements is different between G-actin and F-actin, such that G-actin is “softer” than F-actin. The differences in the internal dynamics are detected for the first time between the different structural states (the monomeric state and the polymerized state). The different behavior observed is ascribed to the differences in dynamical heterogeneity between F-actin and G-actin. Based on structural data, the assignment of the differences observed in the two samples to dynamics of specific loop regions involved in the polymerization of G-actin into F-actin is proposed.
Related Links	http://dx.doi.org/10.1529/biophysj.107.125302
Starting Page	4880
File Format	PDF
ISSN	15420086
e-ISSN	15420086
Journal	Biophysical Journal
Issue Number	12
Volume Number	94
Language	English
Publisher	The Biophysical Society
Publisher Date	2008-06-15
Access Restriction	Open
Rights Holder	The Biophysical Society
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Biophysics

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