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Allosteric Regulation01:08

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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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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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Spatiotemporal Control of Protein Activity through Optogenetic Allosteric Regulation
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Electrostatic Forces Control the Negative Allosteric Regulation in a Disordered Protein Switch.

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    The Journal of Physical Chemistry Letters
    |January 16, 2020
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    A protein switch regulating cellular response to low oxygen (hypoxia) involves HIF-1α and CITED2 binding to TAZ1. CITED2 displaces HIF-1α due to strong electrostatic interactions, revealing a key mechanism in hypoxic adaptation.

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    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Structural Biology

    Background:

    • The transcriptional adaptor zinc-binding 1 (TAZ1) domain of CBP/P300 is crucial for regulating cellular responses.
    • Hypoxia-inducible factor 1-alpha (HIF-1α) and CITED2 are key regulators of the hypoxic response, interacting with TAZ1.
    • CITED2 acts as a negative feedback regulator, displacing HIF-1α from TAZ1 to attenuate the hypoxic response.

    Purpose of the Study:

    • To elucidate the physical mechanism behind CITED2's competitive displacement of HIF-1α from TAZ1.
    • To demonstrate how a coarse-grained model can recapitulate this negative allosteric effect.
    • To provide detailed insights into the protein switch governing cellular hypoxic response.

    Main Methods:

    • Utilized a simple coarse-grained computational model.
    • Simulated protein-protein interactions between TAZ1, HIF-1α, and CITED2.
    • Analyzed binding affinities and displacement dynamics.

    Main Results:

    • The coarse-grained model successfully recapitulated the negative allosteric effect of CITED2 on HIF-1α binding to TAZ1.
    • Identified long-range electrostatic forces as essential for efficient HIF-1α displacement by CITED2.
    • Demonstrated that strong electrostatic interactions and a unique binding mode make CITED2 more competitive than HIF-1α for TAZ1.

    Conclusions:

    • The competitive binding of CITED2 over HIF-1α to TAZ1 is driven by significant electrostatic interactions.
    • This mechanism provides a physical basis for the rapid attenuation of the hypoxic response.
    • Understanding this protein switch offers insights into cellular adaptation to low oxygen environments.