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Intrinsically Disordered Proteins02:18

Intrinsically Disordered Proteins

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...
Intrinsically Disordered Proteins02:18

Intrinsically Disordered Proteins

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...
Protein Organization01:13

Protein Organization

Overview
Protein Organization01:24

Protein Organization

Proteins are polymers of amino acid residues. They are versatile and responsible for different cellular functions, including DNA replication, molecular transport, catalysis, and structural support. Proteins have a hierarchical structure comprising at least three levels of organization: primary, secondary, and tertiary structure. Some large proteins have a quaternary structure where individual protein subunits are linked together.
The primary structure of a protein is its amino acid sequence.
Protein Organization01:13

Protein Organization

Overview
Protein Organization01:24

Protein Organization

Proteins are polymers of amino acid residues. They are versatile and responsible for different cellular functions, including DNA replication, molecular transport, catalysis, and structural support. Proteins have a hierarchical structure comprising at least three levels of organization: primary, secondary, and tertiary structure. Some large proteins have a quaternary structure where individual protein subunits are linked together.
The primary structure of a protein is its amino acid sequence.

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Related Experiment Video

Updated: Jun 1, 2026

NMR 15N Relaxation Experiments for the Investigation of Picosecond to Nanoseconds Structural Dynamics of Proteins
09:25

NMR 15N Relaxation Experiments for the Investigation of Picosecond to Nanoseconds Structural Dynamics of Proteins

Published on: November 1, 2024

Protein structure along the order-disorder continuum.

Charles K Fisher1, Collin M Stultz

  • 1Committee on Higher Degrees in Biophysics, Harvard University, Cambridge, Massachusetts 02139-4307, USA.

Journal of the American Chemical Society
|June 10, 2011
PubMed
Summary
This summary is machine-generated.

This study introduces a new information-theoretic order parameter to quantify protein conformational heterogeneity. This metric effectively measures the range of protein structures, from folded to unfolded states.

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Related Experiment Videos

Last Updated: Jun 1, 2026

NMR 15N Relaxation Experiments for the Investigation of Picosecond to Nanoseconds Structural Dynamics of Proteins
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Published on: November 1, 2024

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Formation of Ordered Biomolecular Structures by the Self-assembly of Short Peptides
07:26

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Published on: November 21, 2013

Area of Science:

  • Biophysics
  • Structural Biology
  • Computational Biology

Background:

  • Proteins exist as an ensemble of conformations influenced by their energy landscape.
  • Existing "folded" and "unfolded" classifications offer a qualitative view of structural heterogeneity.
  • Quantifying conformational heterogeneity is crucial for understanding protein dynamics.

Purpose of the Study:

  • To introduce a novel information-theoretic order parameter for quantifying protein conformational heterogeneity.
  • To demonstrate the parameter's applicability to both folded and unfolded proteins.
  • To provide a method for approximating this parameter from crystallographic B-factors.

Main Methods:

  • Development of an information-theoretic order parameter.
  • Estimation of the order parameter from protein conformational ensembles.
  • Derivation of a formula to approximate the order parameter using crystallographic B-factors.

Main Results:

  • The proposed order parameter successfully quantifies conformational heterogeneity across diverse protein states.
  • The order parameter can be readily estimated from conformational ensembles.
  • A simple approximation using B-factors is feasible.
  • Analysis of a large protein dataset reveals a full spectrum of order-disorder.

Conclusions:

  • The developed order parameter provides a quantitative measure of protein structural heterogeneity.
  • This metric bridges the gap between qualitative classifications and quantitative descriptions of protein states.
  • Proteins exhibit a continuous range of conformational flexibility, challenging binary folded/unfolded distinctions.