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Protein Networks02:26

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An organism can have thousands of different proteins, and these proteins must cooperate to ensure the health of an organism. Proteins bind to other proteins and form complexes to carry out their functions. Many proteins interact with multiple other proteins creating a complex network of protein interactions.
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Binding sites linkages can regulate a protein's function.  For example, enzyme activity is often regulated through a feedback mechanism where the end product of the biochemical process serves as an inhibitor.
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Allosteric regulation of enzymes occurs when the binding of an effector molecule to a site that is different from the active site causes a change in the enzymatic activity. This alternate site is called an allosteric site, and an enzyme can contain more than one of these sites. Allosteric regulation can either be positive or negative, resulting in an increase or decrease in enzyme activity. Most enzymes that display allosteric regulation are metabolic enzymes involved in the degradation or...
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Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a...
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Investigating Protein-Protein Allosteric Network using Current-Flow Scheme.

Wesley M Botello-Smith1, Yun Luo1

  • 1Department of Pharmaceutical Sciences, Western University of Health Sciences, Pomona, California, 91766.

Journal of Computational Chemistry
|November 29, 2019
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Summary
This summary is machine-generated.

This study enhances protein network analysis for studying allosteric regulation in protein-protein binding. The current-flow betweenness method reveals common network changes in ALK2 kinase mutants, shifting it to a catalytically active state.

Keywords:
allosteric networkcurrent-flow betweennesskinasemolecular dynamicsprotein-protein interaction

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Area of Science:

  • Biochemistry and structural biology
  • Computational biology and bioinformatics
  • Molecular and cellular biology

Background:

  • Protein dynamic network analysis is crucial for understanding allosteric regulation.
  • Current-flow betweenness offers a robust method for analyzing signal transmission in protein networks.
  • Previous methods using correlation scores are less effective than current-flow betweenness.

Purpose of the Study:

  • To expand the current-flow betweenness scheme to analyze allosteric regulation in protein-protein binding.
  • To investigate the effects of gain-of-function mutations at the ALK2 kinase and FKBP12 binding interface.
  • To identify network alterations that promote a catalytically competent kinase configuration.

Main Methods:

  • Optimized smoothing functions for contact network construction.
  • Calculated subnetworks between FKBP12 and the ALK2 kinase ATP binding site using current-flow betweenness.
  • Compared protein-protein networks between wild-type and mutant ALK2 kinase structures.

Main Results:

  • Identified statistically significant changes in protein-protein networks common to three ALK2 kinase mutants.
  • Demonstrated that these network changes are associated with an allosteric shift towards a catalytically competent state.
  • Validated the utility of current-flow betweenness for studying allosteric effects in protein-protein interactions.

Conclusions:

  • The current-flow betweenness method effectively reveals allosteric communication pathways in protein-protein binding interfaces.
  • Gain-of-function mutations in ALK2 kinase induce specific network changes that enhance catalytic activity.
  • This approach provides new insights into the mechanisms of allosteric regulation and drug discovery.