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Enzyme Inhibition01:30

Enzyme Inhibition

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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.
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Enzymes02:34

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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.
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Drug Metabolism: Phase I Reactions01:17

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A phase I reaction is a biochemical process that introduces a functionally reactive polar group to a substance. This transformation predominantly occurs in the liver, facilitated by the cytochrome P450 system of hemoproteins situated in the lipophilic endoplasmic reticulum of cells. The metabolite generated through this process can have varying polarities. If it is sufficiently polar, it can be easily excreted in the urine due to its water compatibility. However, if the metabolite is nonpolar,...
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Drug Metabolism: Phase II Reactions01:14

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Phase II reactions are essential for the detoxification and elimination of drugs from the body. These reactions involve the conjugation of parent drugs or their phase I metabolites with endogenous molecules, resulting in more hydrophilic drug conjugates. The primary conjugation reactions in this phase are sulfation and glucuronidation. Both sulfation and glucuronidation typically produce biologically inactive metabolites. However, in some cases involving prodrugs, active metabolites may be...
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Cytochrome P450 (CYP450) enzymes exhibit substrate inhibition, deviating from Michaelis-Menten kinetics. This review explores inhibition mechanisms and strategies to enhance CYP450 catalytic efficiency.

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Area of Science:

  • Biochemistry and enzymology
  • Molecular biology
  • Biotechnology

Background:

  • Cytochrome P450 (CYP450) enzymes are crucial biocatalysts involved in diverse reactions, with applications in medicine and industry.
  • CYP450 enzymes are known to deviate from classic Michaelis-Menten kinetics, exhibiting substrate inhibition at high concentrations.
  • A comprehensive review of substrate inhibition across various CYP450-catalyzed reactions is lacking.

Purpose of the Study:

  • To review examples of substrate inhibition in CYP450 enzymes and discuss atypical Michaelis-Menten kinetic models.
  • To provide insights into the mechanisms underlying CYP450 substrate inhibition.
  • To outline methods for alleviating substrate inhibition in CYP450 and other enzymes.

Main Methods:

  • Literature review of CYP450 substrate inhibition phenomena and kinetic models.
  • Analysis of 3D structures and dynamics of CYP450-enzyme-substrate interactions.
  • Review of traditional fermentation and protein engineering approaches for enzyme modification.

Main Results:

  • Documented substrate inhibition in various CYP450-catalyzed reactions, leading to reduced catalytic efficiency.
  • Exploration of structural and dynamic factors contributing to substrate inhibition.
  • Identified strategies including fermentation and protein engineering to mitigate substrate inhibition.

Conclusions:

  • Understanding CYP450 substrate inhibition is key to optimizing enzyme performance.
  • Protein engineering and fermentation offer viable pathways to overcome substrate inhibition.
  • This review provides a foundation for enhancing CYP450 catalytic efficiency by deregulating substrate inhibition.