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X-Inactivation01:58

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The human X chromosome contains over ten times the number of genes as in the Y chromosome. Since males have only one X chromosome, and females have two, one might expect females to produce twice as many of the proteins, with undesirable results.
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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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Enzymes speed up reactions by lowering the activation energy of the reactants. The speed at which the enzyme turns reactants into products is called the rate of reaction. Several factors impact the rate of reaction, including the number of available reactants. Enzyme kinetics is the study of how an enzyme changes the rate of a reaction.
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Heterotrimeric G proteins are guanine nucleotide-binding proteins. As the name suggests, heterotrimeric G proteins are composed of three subunits: alpha, beta, and gamma. They remain GDP-bound or GTP-bound inside the cells and switch between inactive/active states. The Gα subunit possesses the nucleotide-binding pocket that binds guanine nucleotides and switches between GDP or GTP-bound states. In contrast, the Gꞵ and Gγ subunits are always bound together with high...
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Enzyme-linked receptors are proteins that act as both receptor and enzyme, activating multiple intracellular signals. This is a large group of receptors that include the receptor tyrosine kinase (RTK) family. Many growth factors and hormones bind to and activate the RTKs.
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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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Related Experiment Video

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A Tetracycline-regulated Cell Line Produces High-titer Lentiviral Vectors that Specifically Target Dendritic Cells
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Tetracycline-Inactivating Enzymes.

Jana L Markley1, Timothy A Wencewicz1

  • 1Department of Chemistry, Washington University in St. Louis, St. Louis, MO, United States.

Frontiers in Microbiology
|June 15, 2018
PubMed
Summary
This summary is machine-generated.

New tetracycline antibiotics face threats from emerging enzymatic inactivation resistance. This review covers the structure, mechanism, and inhibition of these enzymes, crucial for next-generation antibiotic development.

Keywords:
antibiotic adjuvantsantibiotic resistanceenzymatic antibiotic inactivationflavin monooxygenasetetracycline destructasestetracyclines

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Area of Science:

  • Antibiotic resistance
  • Medicinal chemistry
  • Enzymology

Background:

  • Tetracyclines are established antibacterial agents with a long history.
  • Advancements in synthesis and scaffold modification aim to overcome existing resistance.
  • Emerging resistance mechanisms, like enzymatic inactivation, pose a significant threat to new tetracyclines.

Purpose of the Study:

  • To review the current understanding of tetracycline-inactivating enzymes.
  • To discuss the structure and mechanism of these enzymes.
  • To explore strategies for inhibiting tetracycline-inactivating enzymes.

Main Methods:

  • Literature review of scientific publications.
  • Analysis of enzyme structures and mechanisms.
  • Synthesis of information on inhibition strategies.

Main Results:

  • Tetracycline-inactivating enzymes represent a growing challenge to next-generation tetracyclines.
  • Understanding enzyme structure and mechanism is key to developing inhibitors.
  • Several strategies for enzyme inhibition are being explored.

Conclusions:

  • Inhibition of tetracycline-inactivating enzymes is critical for the clinical success of new tetracycline antibiotics.
  • Further research into enzyme mechanisms and inhibitor development is necessary.
  • Combating enzymatic inactivation is essential for preserving the utility of tetracyclines.