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Related Concept Videos

Studying the Cytoskeleton01:17

Studying the Cytoskeleton

The cytoskeletal architecture can be studied using different microscopic and biochemical techniques. Electron microscopy was instrumental in discovering the cytoskeletal architecture around the 1960s, which allowed obtaining structural information at a high-resolution level. However, the sample preparation procedure often limits this ability in biological samples. Several protocols have been developed over the years to optimize sample preparation. In one of the protocols known as rotary...
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Related Experiment Video

Updated: Jun 23, 2026

In Vivo Imaging of Muscle-tendon Morphogenesis in Drosophila Pupae
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Published on: February 6, 2018

Time-Resolved Structural Studies on Insect Flight Muscle after Photolysis of Caged-ATP.

G Rapp, K J Poole, Y Maeda

    Biophysical Journal
    |May 12, 2009
    PubMed
    Summary
    This summary is machine-generated.

    Structural changes in insect flight muscle during ATP-induced relaxation occur rapidly, faster than tension relaxation. This suggests actively cycling cross-bridges are few or structurally distinct from rigor bridges.

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    Last Updated: Jun 23, 2026

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    Published on: June 27, 2014

    Area of Science:

    • Muscle physiology
    • Biophysics
    • Structural biology

    Background:

    • Understanding muscle contraction and relaxation mechanisms is crucial.
    • Insect flight muscle exhibits unique properties.
    • The role of ATP in muscle function is well-established, but the kinetics of structural changes during relaxation are less understood.

    Purpose of the Study:

    • To investigate the time course of structural changes during ATP-induced relaxation of insect flight muscle.
    • To determine the kinetics of structural rearrangements at the molecular level.
    • To correlate structural dynamics with tension relaxation.

    Main Methods:

    • Utilized synchrotron radiation for high-intensity X-ray diffraction.
    • Employed photolysis of caged-ATP for rapid ATP concentration increase.
    • Achieved millisecond temporal resolution for X-ray reflections from single muscle events.

    Main Results:

    • Equatorial reflection intensity changed completely towards relaxed values within milliseconds.
    • 14.5 nm meridional reflection intensity changed partially on a similar fast timescale.
    • Structural changes occurred significantly faster than tension relaxation.

    Conclusions:

    • Actively cycling cross-bridges post-ATP release are either too few to be detected in diffraction patterns or structurally different from rigor cross-bridges.
    • The rapid structural rearrangements suggest a complex relaxation process.
    • These findings provide new insights into the dynamics of muscle cross-bridge cycling.