competitive antagonist


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com·pet·i·tive an·tag·o·nist

an antimetabolite.

competitive antagonist

a substance that interferes with usual metabolic activity by competing for binding sites on a substrate (the substance on which an enzyme acts in a chemical reaction) or on an enzyme that ordinarily attacks the substrate. The antagonist is usually an analog of the substrate. See also antimetabolite.
References in periodicals archive ?
It acts as a competitive antagonist of growth hormone releasing hormone at its receptor in pituitary and immune cells12.
Like zafirlukast, montelukast is a competitive antagonist for the cysteinyl leukotrienes.
Pregnenolone has also been demonstrated to partially protect against memory deficits, induced by the administration of an N-Methyl-D-aspartale (NMDA) receptor competitive antagonist.
Together, these findings give indirect evidence for the idea that PA could be a potent competitive antagonist of P2Y12 receptor, and open the possibility to consider it as new member of the non-nucleotide generation of antiplatelet drugs.
The authors conclude that GCA represents a more accurate definition of additivity for mixtures that include partial agonists or competitive antagonist ligands.
Flumazenil is a competitive antagonist at the benzodiazepine receptor with duration of action varying from 140 to 250 minutes.
NK4 is an elastase-generated fragment of hepatocyte growth factor (HGF) containing four kringle domains, initially discovered as a competitive antagonist of HGF.
Sodium sulfacetamide acts as a competitive antagonist to para aminobenzoic acid (PABA), a component of bacterial growth which can lead to the development of rosacea "pimples," while sulfur reportedly inhibits the growth of Propionbacterium acnes and the formation of free fatty acids.
Sodium sulfacetamide acts as a competitive antagonist to paraminobenzoic acid (PABA), an essential component of bacterial growth.
DIM had little AhR-related activity in the HlGl assay (approximately 8% of the maximal effect of TCDD), making it a nearly complete competitive antagonist (Table 2).
This effect appears to be mediated exclusively by GR, because the GR-specific competitive antagonist, RU-486, completely blocked the hormone responsiveness of this construct (Figure 3A).
A sampling of topics: neurochemical and developmental aspects of glutamate receptors in the retina, insights from structure-function studies of AMPA receptor agonists and competitive antagonists, NMDA receptor-mediated activation of arachidonic acid and nitric oxide signaling pathways in the spinal processing of pain, AMPA receptor-mediated neuronal death in motor neuron disease, excitotoxicity and white matter damage, and chemoreception of umami in caterpillars.