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Intrinsically Disordered Proteins02:18

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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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A hydrogen bond is formed when a weakly positive hydrogen atom already bonded to one electronegative atom (for example, the oxygen in the water molecule) is attracted to another electronegative atom from another polar molecule, such as water (H2O), hydrogen fluoride (HF), or ammonia (NH3). The huge electronegativity difference between the H atom (2.1) and the atom to which it is bonded (4.0 for an F atom, 3.5 for an O atom, or 3.0 for an N atom), combined with the very small size of an H atom...
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Hydrogen bonds are weak attractions between atoms that have formed other chemical bonds. One of these atoms is electronegative, like oxygen, and has a partial negative charge. The other is a hydrogen atom that has bonded with another electronegative atom and has a partial positive charge.
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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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Analyzing Protein Dynamics Using Hydrogen Exchange Mass Spectrometry
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Hydrogen bond dynamics in intrinsically disordered proteins.

Nidhi Rawat1, Parbati Biswas

  • 1Department of Chemistry, University of Delhi , Delhi 110007, India.

The Journal of Physical Chemistry. B
|February 28, 2014
PubMed
Summary

Intrinsically disordered proteins (IDPs) internal motions were studied using hydrogen bond dynamics. Group B IDPs showed longer-lasting intramolecular hydrogen bonds than Group A IDPs, influenced by hydrophilic residues.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Computational Biology

Background:

  • Intrinsically disordered proteins (IDPs) lack stable tertiary structures, exhibiting significant conformational flexibility.
  • Understanding the internal dynamics and structural plasticity of IDPs is crucial for their biological functions.
  • Hydrogen bond dynamics offer a powerful tool to probe these motions at a molecular level.

Purpose of the Study:

  • To investigate the hydrogen bond dynamics in two distinct groups of intrinsically disordered proteins.
  • To compare the lifetime and relaxation behavior of intermolecular and intramolecular hydrogen bonds.
  • To elucidate the role of residue type (hydrophilic vs. hydrophobic) in maintaining protein structure and dynamics.

Main Methods:

  • Utilizing molecular dynamics (MD) simulations to model protein behavior.
  • Analyzing continuous and intermittent time autocorrelation functions to quantify hydrogen bond dynamics.
  • Evaluating the lifetimes and relaxation rates of both intermolecular and intramolecular hydrogen bonds.

Main Results:

  • Intermolecular hydrogen bonds between IDPs and water exhibit short lifetimes in both studied groups.
  • Intramolecular hydrogen bonds demonstrate longer lifetimes and slower relaxation rates compared to intermolecular bonds.
  • Group B proteins, featuring regular secondary structures, display longer-lasting intramolecular hydrogen bonds than Group A proteins (completely disordered).
  • Hydrophilic residues contribute to stable intramolecular hydrogen bonds, contrasting with hydrophobic residues.

Conclusions:

  • Hydrogen bond dynamics provide key insights into the structural plasticity and internal motions of intrinsically disordered proteins.
  • The stability of intramolecular hydrogen bonds, particularly those involving hydrophilic residues, plays a significant role in maintaining the conformational equilibrium of IDPs.
  • Differences in hydrogen bond dynamics between distinct IDP structural classes (e.g., Group A vs. Group B) highlight the diverse mechanisms governing their function.