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Hill Equation definitions

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  • Hill Equation
    Describes cooperative ligand binding in allosteric proteins, allowing data to be plotted as a straight line for easier interpretation.
  • Cooperativity
    Refers to the influence that binding of one ligand has on the binding of additional ligands to a protein.
  • Allosteric Protein
    A protein whose function is regulated by the binding of a ligand at a site other than the active site.
  • Hemoglobin
    An allosteric protein with four ligand binding sites, exhibiting cooperative oxygen binding behavior.
  • Ligand Binding Site
    A specific region on a protein where a ligand molecule can attach, influencing protein activity.
  • Hill Constant
    A value indicating the degree of cooperativity in ligand binding, ranging from 0 to the number of binding sites.
  • Hill Plot
    A linear graph used to analyze protein-ligand binding data, derived from the Hill Equation.
  • Fractional Saturation
    Represents the proportion of protein binding sites occupied by ligand molecules.
  • Dissociation Equilibrium Constant
    A measure of a protein's affinity for its ligand, affected by cooperativity and raised to the power of the Hill constant.
  • Concerted Model
    A model of cooperativity where all subunits of a protein change conformation simultaneously upon ligand binding.
  • Sequential Model
    A model of cooperativity where subunits change conformation one at a time as ligands bind.
  • Positive Cooperativity
    Occurs when binding of one ligand increases the affinity for subsequent ligand binding.
  • Negative Cooperativity
    Occurs when binding of one ligand decreases the affinity for subsequent ligand binding.
  • Partial Pressure of Oxygen
    Used as a measure of ligand concentration in hemoglobin binding studies.
  • Hill Coefficient
    Another term for the Hill constant, quantifying the degree of cooperativity in ligand binding.