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Sequential (KNF) Model definitions

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  • Sequential Model
    A framework for allosteric enzymes where subunits transition independently between tense and relaxed states, allowing mixed conformations and both types of cooperativity.
  • KNF Model
    An alternative name for the sequential model, based on the initials of its discoverers, emphasizing independent subunit transitions in allosteric enzymes.
  • Allosteric Enzyme
    A protein with multiple subunits whose activity is regulated by conformational changes and substrate binding, often displaying sigmoidal kinetics.
  • Subunit
    A distinct protein component within an allosteric enzyme, capable of independent conformational changes affecting overall enzyme behavior.
  • T State
    A conformation of an allosteric enzyme subunit characterized by low substrate affinity and inefficient binding, often referred to as the tense state.
  • R State
    A conformation of an allosteric enzyme subunit with high substrate affinity and efficient binding, known as the relaxed state.
  • Hybrid State
    A condition in an allosteric enzyme where some subunits are in the tense state and others in the relaxed state, permitted by the sequential model.
  • Positive Cooperativity
    A phenomenon where substrate binding to one subunit increases the likelihood of neighboring subunits adopting a high-affinity conformation.
  • Negative Cooperativity
    A phenomenon where substrate binding to one subunit decreases the likelihood of neighboring subunits adopting a high-affinity conformation.
  • Induced Fit Model
    A mechanism where substrate binding triggers conformational changes in individual enzyme subunits, central to the sequential model.
  • Concerted Model
    A contrasting model to the sequential model, where all subunits transition simultaneously between conformations, allowing only positive cooperativity.
  • MWC Model
    An alternative name for the concerted model, emphasizing simultaneous transitions and uniform subunit states in allosteric enzymes.
  • Sigmoidal Kinetics
    A kinetic pattern observed in allosteric enzymes, characterized by an S-shaped curve reflecting cooperative substrate binding.
  • Substrate Affinity
    The tendency of an enzyme subunit to bind its substrate, influenced by its conformational state and cooperativity.
  • Regulatory Behavior
    The complex control of enzyme activity through conformational changes and cooperativity, often explained by both sequential and concerted models.