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Related Concept Videos

Cross-bridge Cycle01:26

Cross-bridge Cycle

As muscle contracts, the overlap between the thin and thick filaments increases, decreasing the length of the sarcomere—the contractile unit of the muscle—using energy in the form of ATP. At the molecular level, this is a cyclic, multistep process that involves binding and hydrolysis of ATP, and movement of actin by myosin.
Centroid of a Body01:16

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The centroid is an important concept in engineering, physics, and mechanics. It is the geometric center of a body. It always lies within the body except in cases with holes or cavities. When the material that a body is composed of is uniform or homogeneous, the centroid coincides with its center of mass or the center of gravity.
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Excitation-Contraction Coupling in Skeletal Muscles01:20

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Muscle Coordination and Action01:24

Muscle Coordination and Action

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Agonists
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Related Experiment Video

Updated: Jul 6, 2026

Comparative Analysis of Lower Limb Kinematics between the Initial and Terminal Phase of 5km Treadmill Running
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Tracing kinetic intermediates during ligand binding.

Tanja Mittag1, Brian Schaffhausen, Ulrich L Günther

  • 1J. W. Goethe University, Frankfurt, Center for Biomolecular Magnetic Resonance, Institute of Biophysical Chemistry, Biocenter N230, Marie-Curie-Str. 9, 60439 Frankfurt, Germany.

Journal of the American Chemical Society
|July 22, 2004
PubMed
Summary

Nuclear Magnetic Resonance (NMR) reveals atomic-level protein-ligand binding dynamics. Analyzing NMR line shapes identifies specific kinetic intermediates, explaining binding specificity.

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Last Updated: Jul 6, 2026

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Chemical Physics

Background:

  • Protein-ligand interactions are crucial for biological processes.
  • Determining static structures offers limited insight into dynamic binding events.
  • While biophysical methods provide global dynamics, Nuclear Magnetic Resonance (NMR) offers site-specific, atomic resolution.

Purpose of the Study:

  • To develop and apply a novel NMR-based method for analyzing protein-ligand binding kinetics.
  • To identify and characterize transient kinetic intermediates during the binding process at the amino acid level.
  • To elucidate how ligand-induced intermediate states influence binding specificity.

Main Methods:

  • Analysis of Nuclear Magnetic Resonance (NMR) line shapes.
  • Characterization of site-specific dynamics at atomic resolution.
  • Identification of long-lived kinetic intermediates on the protein-ligand reaction pathway.

Main Results:

  • Demonstrated that NMR line shape analysis can identify individual amino acid-level kinetic intermediates.
  • Showed that different ligands induce distinct intermediate states during protein-ligand interaction.
  • Established a correlation between the lifetimes of these intermediate states and the specificity of protein-ligand binding.

Conclusions:

  • NMR line shape analysis provides a powerful tool for visualizing the kinetic mechanism of protein-ligand interactions.
  • Ligand-induced kinetic intermediates play a critical role in determining binding specificity.
  • This approach offers direct, site-specific insights into the dynamic events governing molecular recognition.