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Enzyme induction is a process in which a molecule (e.g. a drug) induces (i.e. initiates or enhances) the expression of an enzyme.. Enzyme inhibition can refer to . the inhibition of the expression of the enzyme by another molecule
This inhibition may follow the competitive, uncompetitive or mixed patterns. In substrate inhibition there is a progressive decrease in activity at high substrate concentrations, potentially from an enzyme having two competing substrate-binding sites. At low substrate, the high-affinity site is occupied and normal kinetics are followed.
Competitive inhibition can be overcome by adding more substrate to the reaction, which increases the chances of the enzyme and substrate binding. As a result, competitive inhibition alters only the K m, leaving the V max the same. [3] This can be demonstrated using enzyme kinetics plots such as the Michaelis–Menten or the Lineweaver-Burk plot.
K i is the inhibition constant for a drug; the concentration of competing ligand in a competition assay which would occupy 50% of the receptors if no ligand were present. [ 5 ] The Cheng-Prusoff equation produces good estimates at high agonist concentrations, but over- or under-estimates K i at low agonist concentrations.
Enzyme inhibitor, a substance that binds to an enzyme and decreases the enzyme's activity; Reuptake inhibitor, a substance that increases neurotransmission by blocking the reuptake of a neurotransmitter; Lateral inhibition, a neural mechanism that increases contrast between active and (neighbouring) inactive neurons
Product inhibition is a type of enzyme inhibition where the product of an enzyme reaction inhibits its production. [1] Cells utilize product inhibition to regulate of metabolism as a form of negative feedback controlling metabolic pathways . [ 2 ]
Contact inhibition is a regulatory mechanism that functions to keep cells growing into a layer one cell thick (a monolayer). If a cell has plenty of available substrate space, it replicates rapidly and moves freely.
These phosphatases inhibit activation of molecules involved in cell signaling, [10] most commonly by binding to activating receptors including TCRs, BCRs and FcRs. Subsequently, phospholipase Cy and phosphatidylinositol 3-kinase (PLCy and PI3-K) are activated, together leading to the production of phosphoinositol messengers and increase in ...