actomyosin interaction mechanical and energetic properties in different nucleotide binding states肌动球蛋白相互作用力学和能量属性在不同的核苷酸绑定状态.pdfVIP

actomyosin interaction mechanical and energetic properties in different nucleotide binding states肌动球蛋白相互作用力学和能量属性在不同的核苷酸绑定状态.pdf

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actomyosin interaction mechanical and energetic properties in different nucleotide binding states肌动球蛋白相互作用力学和能量属性在不同的核苷酸绑定状态

Int. J. Mol. Sci. 2008, 9, 1927-1943; DOI: 10.3390/ijms9101927 OPEN ACCESS International Journal of Molecular Sciences ISSN 1422-0067 /ijms Article Actomyosin Interaction: Mechanical and Energetic Properties in Different Nucleotide Binding States Iuliana Aprodu, Alberto Redaelli and Monica Soncini * Department of Bioengineering, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133, Milano, Italy. E-Mails: iuliana.aprodu@polimi.it (I. A.); alberto.redaelli@polimi.it (A. R.) * Author to whom correspondence should be addressed; E-Mail: monica.soncini@polimi.it; Tel. +39-02 Fax: +39-02 Received: 22 May 2008; in revised form: 8 October 2008 / Accepted: 10 October 2008 / Published: 13 October 2008 Abstract: The mechanics of the actomyosin interaction is central in muscle contraction and intracellular trafficking. A better understanding of the events occurring in the actomyosin complex requires the examination of all nucleotide-dependent states and of the energetic features associated with the dynamics of the cross-bridge cycle. The aim of the present study is to estimate the interaction strength between myosin in nucleotide- free, ATP, ADP·Pi and ADP states and actin monomer. The molecular models of the complexes were constructed based on cryo-electron microscopy maps and the interaction properties were estimated by means of a mol

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