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Related Concept Videos

¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR01:15

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The axial and equatorial protons in cyclohexane can be distinguished by performing a variable-temperature NMR experiment. In this process, except for one proton, the remaining eleven protons are replaced by deuterium. The deuterium substitution avoids the possible peak splitting caused by the spin-spin coupling between the adjacent protons. The remaining proton flips between the axial and equatorial positions.
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¹H NMR of Conformationally Flexible Molecules: Temporal Resolution00:52

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At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...
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Intrinsically disordered proteins are a group of proteins that do not fold into specific three-dimensional structures. Their structural flexibility allows them to complement ordered proteins to perform functions that are inaccessible to rigid structures. They are more common in eukaryotes than prokaryotes and may either be exclusively intrinsically disordered or hybrid proteins, consisting of a mix of ordered and disordered regions. The absence of a rigid structure in these proteins can be...
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Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
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A covalently bonded heteronuclear diatomic molecule can be modeled as two vibrating masses connected by a spring. The vibrational frequency of the bond can be expressed using an equation derived from Hooke's law, which describes how the force applied to stretch or compress a spring is proportional to the displacement of the spring. In this case, the atoms behave like masses, and the bond acts like a spring.
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Time-Resolved Fluorescence Anisotropy from Single Molecules for Characterizing Local Flexibility in Biomolecules
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ATLAS: protein flexibility description from atomistic molecular dynamics simulations.

Yann Vander Meersche1, Gabriel Cretin1, Aria Gheeraert1

  • 1Université Paris Cité and Université des Antilles and Université de la Réunion, INSERM, BIGR, F-75014 Paris, France.

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Summary

We developed ATLAS, a comprehensive database of protein dynamics simulations and analyses. It provides insights into protein movement, aiding researchers in understanding protein function and interactions.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Computational Biology

Background:

  • Protein dynamical behavior is critical for function but challenging to study due to data limitations.
  • Existing methods for analyzing protein dynamics are often hindered by data heterogeneity and accessibility issues.

Purpose of the Study:

  • To create ATLAS, a standardized database of all-atom molecular dynamics simulations and analyses.
  • To provide a large-scale resource for exploring protein dynamics, including functional regions and unusual properties.

Main Methods:

  • Standardized all-atom molecular dynamics simulations.
  • Integration of simulation data with experimentally derived structural information.
  • Development of interactive diagrams and trajectory visualizations for data exploration.

Main Results:

  • ATLAS offers a comprehensive view of protein dynamics across a diverse set of proteins.
  • The database facilitates analysis of functional regions like hinge positions and interaction sites.
  • ATLAS enables the study of unique dynamic behaviors such as chameleon subsequences and Dual Personality Fragments.

Conclusions:

  • ATLAS addresses the challenge of protein dynamics analysis by providing accessible, standardized simulation data.
  • The database enhances understanding of protein function by revealing dynamic properties and interactions.
  • ATLAS is a valuable, freely available resource for the scientific community studying protein dynamics.