Key result
Myosin heads are responsible for most of the intensity on the myosin layer-lines, including the M3 meridional, while titin is the main contributor to the M11 layer line.
Why the study?
Interpretation of striated muscle X-ray diffraction patterns has been complicated by multiple filament components contributing to reflections and reliance on low-resolution structural models.
Population
Atomic model of the human cardiac thick filament C-zone derived from cryo-EM
Comparison
Inclusion versus exclusion of myosin heads, tails, titin, and cMyBP-C in diffraction calculations
Design
Computational modeling study
Authors
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Advances structural models of cardiac thick filaments; leaves open disease-specific dynamics in humans.
Using a cryo-EM-based atomic model, this study clarifies the structural origins of X-ray diffraction patterns in striated muscle, showing that myosin heads and titin, rather than myosin tails, drive key reflections.
Koubassova et al. (2025) studied Striated muscle structure. Computational modeling of X-ray diffraction vs. Full atomic model was evaluated on Layer line intensities in X-ray diffraction pattern. Myosin heads are responsible for most of the intensity on the myosin layer-lines, including the M3 meridional, while titin is the main contributor to the M11 layer line.
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