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Related Concept Videos

What are Proteins?01:55

What are Proteins?

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What are Proteins?01:28

What are Proteins?

Proteins are polymers of amino acids linked together by peptide bonds. Proteins and polypeptides are interchangeably used to refer to long chains of amino acids. However, polypeptides have a molecular weight of fewer than 10,000 daltons, while proteins have greater molecular weight.  Polypeptides with less than 20 amino acids are called oligopeptides or simply peptides. Interactions among the constituent amino acid side chains of proteins help them fold into a stable 3-dimensional structure...
Protein Organization01:24

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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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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

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Corresponding-states laws for protein solutions.

Panagiotis Katsonis1, Simon Brandon, Peter G Vekilov

  • 1Departments of Chemical Engineering and Chemistry, University of Houston, Houston, Texas 77204, USA.

The Journal of Physical Chemistry. B
|September 1, 2006
PubMed
Summary

Protein solutions exhibit structured solvent layers, leading to repulsive forces. The van der Waals law effectively predicts liquid-liquid separation in these systems, offering a universal approach for protein phase behavior.

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Area of Science:

  • Physical Chemistry
  • Biophysics
  • Materials Science

Background:

  • The solvent surrounding protein molecules in solution is structured.
  • This structuring induces repulsive forces in the intermolecular potential at intermediate distances.
  • Understanding protein solution phase behavior is crucial for various applications.

Purpose of the Study:

  • To investigate if liquid-liquid and liquid-solid phase lines in model protein solutions can be predicted using universal curves and experimentally determined parameters.
  • To test the applicability of laws of corresponding states for protein solutions, similar to atomic and colloid systems.
  • To develop predictive models for critical temperature and volume fraction based on intermolecular potential characteristics.

Main Methods:

  • Monte Carlo simulations were employed for isotropic, pair-additive systems with structured solvent potentials.
  • Three properties at the critical point for liquid-liquid separation were tested as predictors: critical temperature, second virial coefficient, and a modified second virial coefficient, all paired with critical volume fraction.
  • Analysis extended to experimental data for liquid-liquid equilibrium of various proteins and solid-liquid equilibrium.

Main Results:

  • The van der Waals law demonstrated the best adherence and greatest generality, with a single universal curve describing all tested nonconformal isotropic pair-additive systems.
  • Published experimental data for protein liquid-liquid equilibrium across different conditions consistently followed this single van der Waals curve.
  • No single system property effectively predicted the solid-liquid equilibrium.

Conclusions:

  • The van der Waals law provides a robust and general framework for predicting liquid-liquid separation in protein solutions.
  • Semiempirical laws were developed to predict critical temperature and volume fraction using only the range of attraction of the intermolecular potential.
  • The findings offer a universal approach to understanding and predicting protein phase behavior, moving beyond traditional corresponding-states correlations.