Enzyme Inhibition
Enzyme Inhibition - Related Videos
01:30
Enzyme Inhibition
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2025
Inhibitors are molecules that reduce enzyme activity by binding to the enzyme. In a normally functioning cell, enzymes are regulated by a variety of inhibitors. Drugs and other toxins can also inhibit enzymes. Some inhibitors bind to the enzyme’s active site, while others inhibit enzymatic activity by binding to other sites on the protein structure. Competitive inhibitors occupy the active site of enzymes, making them unable to accommodate the substrate. However, sufficiently high...
03:47
Microscopic Assessment of Enzyme-Mediated Inhibition of Biofilm Formation
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2026
Source: Tay, S. B., et.al. Anti-virulent Disruption of Pathogenic Biofilms using Engineered Quorum-quenching Lactonases. J. Vis. Exp. (2016)This video demonstrates the process of inhibiting biofilm formation by introducing an enzyme that disrupts bacterial cell signaling. The enzyme prevents the bacteria from producing extracellular polymeric substances, thereby reducing biofilm development on a glass-bottomed microdish. Finally, the biofilm structure is visualized using fluorescent lectins and...
08:11
Measuring Influenza Neuraminidase Inhibition Antibody Titers by Enzyme-linked Lectin Assay
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Cited by 54 •
2016
We describe the enzyme-linked lectin assay (ELLA) for measuring influenza neuraminidase (NA)-inhibition antibody titers in sera. The assay uses peanut agglutinin to quantify galactose residues that become accessible when NA removes sialic acid from fetuin-coated, 96-well plates.
00:46
Feedback Inhibition
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2019
Biochemical reactions are occurring constantly in cells, converting starting substances to different products, usually with the help of enzymes that speed the reactions. Without enzymes, it would take far too long for most reactions to occur to be useful to the cell! Since enzymes help control the rate of reactions, their activity is regulated so that appropriate amounts of starting materials, intermediate metabolites, and products are maintained in the cell. Excessive build-up or depletion of...
02:34
Enzymes
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2020
Inside living organisms, enzymes act as catalysts for many biochemical reactions involved in cellular metabolism. The role of enzymes is to reduce the activation energies of biochemical reactions by forming complexes with its substrates. The lowering of activation energies favor an increase in the rates of biochemical reactions. Enzyme deficiencies can often translate into life-threatening diseases. For example, a genetic abnormality resulting in the deficiency of the enzyme G6PD...
FAQs
Because the inhibitor and substrate seek the same active site, increasing substrate concentration changes the balance between their binding opportunities. This makes substrate concentration a key variable for recognizing competitive behavior in kinetic experiments. Comparing reaction rates at several substrate levels, with and without inhibitor, helps determine whether the observed reduction is consistent with active-site competition.
Binding outside the active site can influence catalysis by changing the enzyme’s conformation, rather than directly displacing substrate. This allosteric effect explains why substrate competition alone may not account for the rate decrease. In chemistry and biochemistry, distinguishing altered conformation from active-site occupancy helps connect molecular interactions with measured catalytic behavior.
Reversible and irreversible inhibition describe how the inhibitory interaction determines the persistence of activity loss. Reversible effects can be considered in relation to changing experimental conditions, whereas irreversible effects represent a more lasting interruption of catalysis. This distinction matters when interpreting kinetic results and evaluating inhibitors for regulation, toxicology, or drug design.
Researchers distinguish inhibition mechanisms by examining how reaction rate changes as both substrate concentration and inhibitor concentration vary. A single rate measurement cannot provide the same comparison. Structured kinetic observations instead connect concentration-dependent outcomes with either active-site competition or conformational effects, supporting a more informed interpretation of the inhibitory process.
A basic investigation compares reaction rates under controlled changes in substrate concentration and inhibitor concentration. Measurements are made with the inhibitor present and absent, allowing the effect of each variable to be evaluated. Organizing the comparison this way supplies the kinetic evidence needed to characterize inhibition and distinguish competing mechanistic explanations.
Kinetic analysis turns changes in reaction rate into evidence about how an inhibitor acts. By relating rate measurements to substrate and inhibitor concentrations, researchers can characterize enzyme kinetics and assess whether observations fit active-site competition or binding that changes conformation. The resulting interpretation supports mechanistic studies rather than relying only on an observed decrease in activity.
Enzyme inhibition supports drug design, toxicology, and metabolic research because each field may need to understand or control catalytic activity. The same principles also help develop tools for controlling chemical reactions. Studying the kinetic response provides a way to connect inhibitor behavior with biochemical regulation and practical experimental objectives.