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Related Concept Videos

Overview of Myosin Structure and Function01:15

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Myosins are a family of molecular motor proteins, first identified in the skeletal muscles, where they are responsible for muscle contraction. Along with their role in muscle contraction, these proteins also play a role in the intracellular transport of molecules and vesicles. There are twenty-four classes of myosins based on their domain sequence and organization. Of the twenty-four, six classes (Myosin I, Myosin II, Myosin V, Myosin VI, Myosin VII, and Myosin X)  have been well...
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Actin and myosin are contractile proteins that form the sarcomere found in skeletal muscle tissues for regulating muscle contraction. Actin, a globular contractile protein, interacts with myosin for muscle contraction. The skeletal tissue appears striped or striated under a microscope due to the repeated arrangement of contractile proteins actin and myosin along the length of myofibrils. Dark A bands and light I bands repeat along myofibrils, and the alignment of myofibrils in the cell causes...
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In animals, the mitochondrial F1F0 ATP synthase is the key protein that synthesizes ATP molecules through a complex catalytic mechanism. While the nuclear genome encodes the majority of ATP synthase subunits, the mitochondrial genome encodes some of the enzyme's most critical components. The formation of this multi-subunit enzyme is a complex multi-step process regulated at the level of transcription, translation, and assembly. Defects in one or more of these steps can result in decreased...
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ATP synthase or ATPase is among the most conserved proteins found in bacteria, mammals, and plants. This enzyme can catalyze a forward reaction in response to the electrochemical gradient, producing ATP from ADP and inorganic phosphate. ATP synthase can also work in a reverse direction by hydrolyzing ATP and generating an electrochemical gradient. Different forms of ATP synthases have evolved special features to meet the specific demands of the cell. Based on their specific feature, ATP...
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Interacting myosin head dynamics and their modification by 2'-deoxy-ADP.

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The interacting heads motif (IHM) in myosin regulates muscle contraction. 2'-deoxy-ATP (dATP) destabilizes the IHM, revealing molecular mechanisms that could inform therapies for muscle disorders.

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Area of Science:

  • Muscle physiology
  • Molecular biology
  • Biophysics

Background:

  • Striated muscle contraction relies on myosin motor proteins within sarcomeres.
  • Myosin can enter an inactive, interacting heads motif (IHM) state, regulating contractility and energy use.
  • Disruption of the IHM structure can impair muscle function, making it a therapeutic target.

Purpose of the Study:

  • To investigate the molecular mechanisms by which 2 -deoxy-ATP (dATP) alters the structure and dynamics of myosin in its sequestered IHM state.
  • To understand how dATP binding affects the stability and interactions within the IHM.

Main Methods:

  • Molecular dynamics simulations were employed to model the myosin IHM.
  • Simulations were performed with ADP.Pi and subsequently with dADP.Pi in the nucleotide binding pockets.
  • Comparative analysis of structural and dynamic changes at the blocked head-free head interface and light chain binding region.

Main Results:

  • Simulations of the IHM with ADP.Pi showed dynamic motions in the blocked head-free head interface, light chain binding domain, and S2.
  • Replacing ADP.Pi with dADP.Pi increased heterogeneity at the blocked head-free head interface and reduced interaction energy by 14%.
  • These interfacial changes correlated with dynamics in the light chain binding region, suggesting a coordinated response.

Conclusions:

  • dATP binding significantly alters the structure and dynamics of the myosin IHM, destabilizing key interactions.
  • The study identified specific structural sites and dynamic changes associated with dATP-induced IHM destabilization.
  • These findings provide molecular insights into how dATP activates myosin and offer potential targets for therapeutic interventions in muscle diseases.