Structure of the rigor actin-tropomyosin-myosin complex.

Structure of the rigor actin-tropomyosin-myosin complex.
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DOI:
10.1016/j.cell.2012.05.037
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发表时间:
2012-07-20
期刊:
影响因子:
64.5
通讯作者:
Raunser S
Raunser S
中科院分区:
生物学1区
文献类型:
--
作者:
Behrmann E;Müller M;Penczek PA;Mannherz HG;Manstein DJ;Raunser S

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The interaction of myosin with actin filaments is the central feature of muscle contraction and cargo movement along actin filaments of the cytoskeleton. Myosin converts the chemical energy stored in ATP into force and movement along actin filaments. Myosin binding to actin induces conformational changes that are coupled to the nucleotide-binding pocket and amplified by a specialized region of the motor domain for efficient force generation. Tropomyosin plays a key role in regulating the productive interaction between myosins and actin. Here, we report the 8 Å resolution structure of the actin-tropomyosin-myosin complex determined by cryo electron microscopy. The pseudo-atomic model of the complex obtained from fitting crystal structures into the map defines the large actin-myosin-tropomyosin interface and the molecular interactions between the proteins in detail and allows us to propose a structural model for tropomyosin dependent myosin binding to actin and actin-induced nucleotide release from myosin.
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