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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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In ordinary chemical reactions, the nucleus — which contains the protons and neutrons of each atom and thus identifies the element — remains unchanged. Electrons, however, can be added to atoms by transfer from other atoms, lost by transfer to other atoms, or shared with other atoms. The transfer and sharing of electrons among atoms govern the chemistry of the elements. During the formation of some compounds, atoms gain or lose electrons to form electrically charged particles called...
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The ionic strength of a solution is a quantitative way of expressing the total electrolyte concentration of a solution. This concept was first introduced in 1921 by two American physical chemists, Gilbert N. Lewis and Merle Randall, while describing the activity coefficient of strong electrolytes. During the calculation of ionic strength (I or μ), all the cations and anions are considered. However, the concentration (c) of an ion with a greater charge number (z) has a greater contribution...
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When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
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Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
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Modulating charge patterning and ionic strength as a strategy to induce conformational changes in intrinsically

Jonathan Huihui1, Taylor Firman1, Kingshuk Ghosh1

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Area of Science:

  • Biophysics
  • Polymer Physics
  • Computational Biology

Background:

  • Intrinsically Disordered Proteins (IDPs) lack stable 3D structures.
  • Protein conformation is influenced by environmental factors like salt concentration.
  • Understanding sequence-specific effects is crucial for IDP function.

Purpose of the Study:

  • To develop an analytical theory for polymer conformational changes based on charge sequence.
  • To apply this theory to Intrinsically Disordered Proteins (IDPs).
  • To investigate sequence-specific charge patterning effects on protein conformation as a function of salt concentration.

Main Methods:

  • Analytical theory incorporating Debye-Hückel approximation for electrostatics.
  • Mean-field approximation for non-electrostatic interactions (two- and three-body).
  • Utilized parameters from all-atom Monte Carlo simulations.

Main Results:

  • Conformational transitions strongly depend on the specific arrangement of charged residues.
  • Observed globule-to-coil transitions with increasing salt, contrary to net-charge-based theories.
  • Predicted non-monotonic salt-dependent behavior and drastic differences due to phosphorylation site or single-site mutations.

Conclusions:

  • Charge patterning, not just net charge, dictates salt-induced conformational changes in IDPs.
  • The theory provides insights into biological regulation via post-translational modifications and mutations.
  • Identifies potential 'hot spots' for sequence design and understanding biological regulation.