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Low-angle x-ray diffraction reveals the molecular structure of muscle filaments. New atomic modeling shows myosin heads dominate diffraction patterns, while myosin tails contribute minimally, offering insights into muscle contraction.

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Area of Science:

  • Biophysics
  • Structural Biology
  • Muscle Physiology

Background:

  • Low-angle x-ray diffraction (LAXD) is crucial for analyzing myofilament molecular structure in striated muscle.
  • LAXD has advanced understanding of myosin head organization in thick filaments within skeletal and cardiac muscle.
  • Interpreting LAXD patterns requires modeling, often limited by low-resolution structural data and complex contributions from multiple filament components.

Purpose of the Study:

  • To utilize an atomic model of the human cardiac thick filament C-zone to compute component contributions to the diffraction pattern.
  • To objectively assess the roles of myosin heads, tails, titin, and cMyBP-C in LAXD patterns.
  • To refine models of muscle contraction by clarifying structural contributions to x-ray reflections.

Main Methods:

  • Employed an atomic model of the human cardiac thick filament C-zone derived from cryo-electron microscopy (cryo-EM).
  • Utilized the myosin inhibitor mavacamten during model derivation.
  • Performed computational analysis by including/excluding specific filament components (myosin heads, tails, titin, cMyBP-C) to calculate their diffraction contributions.

Main Results:

  • Confirmed myosin heads are the primary source of intensity on myosin layer lines, including the M3 meridional reflection.
  • Found myosin tails contribute minimally to the diffraction pattern, including the M6 meridional reflection, which mainly originates from heads and other components.
  • Determined the M11 layer line (39-Å spacing) arises predominantly from the titin structure, enabling its use as a strain measure in the myosin filament backbone.

Conclusions:

  • The study provides a more accurate deconvolution of structural contributions to muscle x-ray diffraction patterns.
  • Findings challenge previous assumptions about myosin tail contributions and highlight titin's role in the M11 layer line.
  • These insights will enhance the interpretation of x-ray patterns from intact muscle under various physiological and pharmacological conditions.