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Structural features of force-generating cross-bridges. A 2D-X-ray diffraction study

T Kraft1, T Mattei, B Brenner

  • 1Medical School Hannover, Department of Clinical Physiology, Germany.

Advances in Experimental Medicine and Biology
|January 16, 1999
PubMed
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Muscle contraction models suggest rigor-like cross-bridges generate force. However, X-ray diffraction reveals force-generating cross-bridges in isometric contraction adopt a non-rigor conformation, challenging existing theories.

Area of Science:

  • Muscle physiology
  • Biophysics
  • Structural biology

Background:

  • Muscle contraction models propose force-generating cross-bridges adopt a rigor-like conformation.
  • Previous 2D-X-ray diffraction studies during isometric contraction failed to detect rigor-like cross-bridge features.
  • This led to the hypothesis that the number of force-generating cross-bridges is too low for detection.

Purpose of the Study:

  • To investigate the structural conformation of force-generating cross-bridges during muscle contraction.
  • To test the hypothesis that rigor-like cross-bridges are responsible for force generation.
  • To analyze 2D-X-ray diffraction patterns under varying nucleotide analog concentrations to simulate different cross-bridge fractions.

Main Methods:

  • Studied 2D-X-ray diffraction patterns of muscle fibers with varying fractions of rigor-like cross-bridges induced by ATP gamma S at high calcium.

Related Experiment Videos

  • Analyzed intensity changes of actin layer lines at specific reciprocal space points (1/370 Å⁻¹ and 1/59 Å⁻¹).
  • Correlated diffraction data with mechanical experiments and compared patterns from isometric contraction, relaxed, and rigor states.

    • Main Results:

    • Despite a high fraction (55-70%) of force-generating cross-bridges during isometric contraction, no rigor-like features were detected in X-ray diffraction patterns.
    • The intensity distribution along actin layer lines differed significantly between rigor and isometric contraction states.
    • Even with a fully activated system and attached weak-binding cross-bridges, diffraction patterns did not resemble the rigor state.

    Conclusions:

    • The majority of force-generating cross-bridges during isometric muscle contraction appear to be in a conformation distinct from rigor.
    • This finding challenges existing models that propose a rigor-like state is essential for force generation in muscle.
    • The structural state of force-generating cross-bridges during contraction is different from the rigor state, as evidenced by X-ray diffraction.