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Related Concept Videos

Intrinsically Disordered Proteins02:18

Intrinsically Disordered Proteins

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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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Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
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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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Ensemble Calculation for Intrinsically Disordered Proteins Using NMR Parameters.

Jaka Kragelj1,2,3, Martin Blackledge1,2,3, Malene Ringkjøbing Jensen4,5,6

  • 1IBS, University Grenoble Alpes, 38044, Grenoble, France.

Advances in Experimental Medicine and Biology
|September 21, 2015
PubMed
Summary
This summary is machine-generated.

Intrinsically disordered proteins (IDPs) lack stable structures but have functions. This study uses nuclear magnetic resonance and ensemble modeling to describe IDP dynamics and local structures, aiding in understanding their function.

Keywords:
Conformational ensemblesDynamicsExperimental validationStructure

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Biophysics

Background:

  • Intrinsically disordered proteins (IDPs) lack a fixed tertiary structure yet carry out essential biological functions.
  • Residual structures in IDPs are dynamic and transient, posing challenges for characterization.
  • Understanding the link between primary sequence and IDP structural dynamics is crucial for elucidating their function.

Purpose of the Study:

  • To provide atomic-level descriptions of intrinsically disordered proteins.
  • To elucidate how protein primary sequence dictates dynamic and structural properties of IDPs.
  • To detail sample-and-select approaches for ensemble modeling of IDP local structural propensities.

Main Methods:

  • Utilizing Nuclear Magnetic Resonance (NMR) spectroscopy for amino acid-specific structural information.
  • Employing ensemble descriptions to represent the dynamic nature of IDPs.
  • Applying sample-and-select strategies for computational modeling of IDP structures.

Main Results:

  • NMR spectroscopy provides detailed insights into local and long-range structural elements in IDPs.
  • Ensemble modeling, combined with NMR data, can effectively represent the conformational flexibility of IDPs.
  • Validation of these ensembles is critical for accurate structural representation.

Conclusions:

  • Atomic-level descriptions are essential for understanding IDP function.
  • NMR spectroscopy and ensemble modeling are powerful tools for characterizing IDP dynamics.
  • The described methods facilitate the study of local structural propensities in intrinsically disordered proteins.