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Related Concept Videos

Regulated Protein Degradation02:58

Regulated Protein Degradation

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It is vital to regulate the activity of enzymatic as well as non-enzymatic proteins inside the cell. This can be achieved either through creating a balance between their rate of synthesis and degradation or regulating the intrinsic activity of the protein. Both these regulation mechanisms play an essential role in the normal functioning of cells.
Protein degradation plays two important roles in the cells. It helps to protect cells from misfolded or damaged proteins before they lead to a...
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Guanine nucleotide-binding proteins (G-proteins), also known as GTPases, are a superfamily of proteins that regulate many cellular processes, such as cell signaling, vesicular transport, and the regulation of cell shape and motility. Mutation or dysfunction of these proteins can lead to disease. There are around 40,000 known G-proteins that can broadly be classified into two groups ‒  small G-proteins consisting of a single domain and large multi-domain G-proteins.
Large G-proteins,...
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Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a  complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...
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To consistently produce healthy cells, the cell cycle—the process that generates daughter cells—must be precisely regulated.
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Related Experiment Video

Updated: Feb 6, 2026

Unraveling the Role of Discrete Areas of the Rat Brain in the Regulation of Ovulation through Reversible Inactivation by Tetrodotoxin Microinjections
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H2O2 has a role in cellular regulation.

T Ramasarma1

  • 1Department of Biochemistry, Indian Institute of Science, Bangalore.

Indian Journal of Biochemistry & Biophysics
|October 1, 1990
PubMed
Summary

Hydrogen peroxide (H2O2) directly impacts cellular functions, stimulating some pathways while inhibiting others. It also acts as a signaling molecule in oxidative stress, modulating gene expression through protein modification.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Oxidative Stress Research

Background:

  • Hydrogen peroxide (H2O2) is a reactive oxygen species with known roles in cellular signaling and damage.
  • Understanding the direct cellular effects of H2O2 is crucial for comprehending cellular responses to oxidative stress.

Purpose of the Study:

  • To elucidate the diverse direct effects of hydrogen peroxide (H2O2) on cellular processes, organelles, and enzymes.
  • To investigate the role of H2O2 as a signal transducer in oxidative stress, particularly its mechanism involving protein modification.

Main Methods:

  • Review and synthesis of existing literature on the direct cellular actions of H2O2.
  • Analysis of H2O2-induced stimulatory and inhibitory effects on various metabolic pathways and enzyme activities.

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  • Examination of H2O2's role in signal transduction via dithiol-disulphide protein modification.

    • Main Results:

    • H2O2 directly stimulates pathways such as glucose transport, lipid synthesis, and specific enzyme activities (e.g., pyruvate dehydrogenase).
    • H2O2 inhibits other pathways including glycolysis, lipolysis, and ATP synthesis, and can cause DNA damage and cytotoxicity.
    • H2O2 acts as a signal transducer by oxidizing dithiol proteins to disulphide forms, activating stress-inducible gene transcription.

    Conclusions:

    • Hydrogen peroxide exerts a wide range of direct cellular effects, both stimulatory and inhibitory, impacting numerous metabolic functions.
    • The direct effects of H2O2 are often mediated by dithiol-disulphide modification of proteins, highlighting its role in adaptive responses to oxidative stress.
    • H2O2's function as a signal transducer in oxidative stress opens new avenues for understanding cellular defense mechanisms.