Product Inhibition
Product Inhibition - Related Videos
11:00
Methods to Inhibit Bacterial Pyomelanin Production and Determine the Corresponding Increase in Sensitivity to Oxidative Stress
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Cited by 12 •
2015
Bacterial pyomelanin production results in increased resistance to oxidative stress and virulence. We report on techniques that can be used to determine inhibition of pyomelanin production and assay the resulting increase in sensitivity to oxidative stress in bacteria, as well as determine antibiotic minimum inhibitory concentration (MIC).
02:29
Measuring Immune-Induced Inhibition of Seedling Growth
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2025
This video demonstrates the seedling growth inhibition assay in the Arabidopsis thaliana plant. The impact of increased concentration of immune peptide elicitor on seedling growth is determined.
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.
03:19
An Assay to Measure Influenza Neuraminidase Inhibition Antibody Titers
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2025
This video demonstrates an assay measuring influenza neuraminidase (NA) inhibiting antibody titers in a serum sample. A serum sample containing antibodies against NA is added to a fetuin-coated microwell plate. Upon adding the virus, the antibodies prevent viral NA from cleaving fetuin and exposing its galactose moiety. A peroxidase-conjugated lectin is then added, which binds to the exposed galactose. The NA-inhibiting antibody titer is determined using a colorimetric test, where a peroxidase...
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...
FAQs
A reaction product can reduce catalytic efficiency in two principal ways. It may compete with the substrate for the enzyme’s active site, limiting substrate access, or bind at another site and alter the enzyme’s conformation. These mechanisms produce inhibition through different molecular interactions, but both connect product accumulation with reduced activity of the enzyme that generated it.
The extent of product inhibition depends on the relative availability of product and substrate. Increasing product concentration can favor inhibitory binding, whereas greater substrate availability may influence competition for the active site. Examining both variables helps reveal whether reduced activity is associated primarily with active-site competition or with another product-dependent change in enzyme behavior.
By lowering enzyme activity as a reaction product becomes more abundant, product inhibition can help prevent unnecessary accumulation of downstream compounds. This provides a regulatory connection between reaction output and enzyme performance. In cellular metabolism, analyzing that connection helps explain how pathways balance production with the changing concentrations of their compounds.
Researchers can examine enzyme activity while varying the concentration of the reaction product and the availability of substrate. Comparing activity under these conditions helps determine how strongly the product affects catalysis and whether the pattern is consistent with active-site competition or binding elsewhere. Such measurements support enzyme-kinetic analysis and clarify the conditions that influence inhibition.
These studies can show how product concentration changes catalytic efficiency and how substrate availability modifies that response. The resulting activity patterns provide evidence about the interaction between enzyme, substrate, and product. Researchers can use this information to analyze enzyme kinetics, identify factors controlling reaction performance, and connect molecular behavior with regulation of a broader pathway.
Product inhibition can limit biochemical production when an accumulating product reduces the activity of the enzyme making it. Studying this effect helps identify pathway-control constraints and supports strategies intended to improve production. The same analysis can guide evaluation of reaction conditions by showing how product concentration and substrate availability influence enzyme performance during a biochemical process.