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Related Concept Videos

Activation Energy01:26

Activation Energy

Activation energy is the minimum amount of energy necessary for a chemical reaction to move forward. The higher the activation energy, the slower the rate of the reaction. However, adding heat to the reaction will increase the rate, since it causes molecules to move faster and increase the likelihood that molecules will collide. The collision and breaking of bonds represents the uphill phase of a reaction and generates the transition state. The transition state is an unstable high-energy state...
Enzymes02:34

Enzymes

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...
Enzymes and Activation Energy01:13

Enzymes and Activation Energy

The activation energy (or free energy of activation), abbreviated as Ea, is the small amount of energy input necessary for all chemical reactions to occur. During chemical reactions, certain chemical bonds break, and new ones form. For example, when a glucose molecule breaks down, bonds between the molecule's carbon atoms break. Since these are energy-storing bonds, they release energy when broken. However, the molecule must be somewhat contorted to get into a state that allows the bonds to...
Introduction to Mechanisms of Enzyme Catalysis01:13

Introduction to Mechanisms of Enzyme Catalysis

For many years, scientists thought that enzyme-substrate binding took place in a simple "lock-and-key" fashion. This model stated that the enzyme and substrate fit together perfectly in one instantaneous step. However, current research supports a more refined view scientists call induced fit. The induced-fit model expands upon the lock-and-key model by describing a more dynamic interaction between enzyme and substrate. As the enzyme and substrate come together, their interaction causes a mild...
Enzymes and Activation Energy01:13

Enzymes and Activation Energy

The activation energy (or free energy of activation), abbreviated as Ea, is the small amount of energy input necessary for all chemical reactions to occur. During chemical reactions, certain chemical bonds break, and new ones form. For example, when a glucose molecule breaks down, bonds between the molecule's carbon atoms break. Since these are energy-storing bonds, they release energy when broken. However, the molecule must be somewhat contorted to get into a state that allows the bonds to...
Introduction to Mechanisms of Enzyme Catalysis01:13

Introduction to Mechanisms of Enzyme Catalysis

For many years, scientists thought that enzyme-substrate binding took place in a simple "lock-and-key" fashion. This model stated that the enzyme and substrate fit together perfectly in one instantaneous step. However, current research supports a more refined view scientists call induced fit. The induced-fit model expands upon the lock-and-key model by describing a more dynamic interaction between enzyme and substrate. As the enzyme and substrate come together, their interaction causes a mild...

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Related Experiment Video

Updated: Jun 18, 2026

Unraveling Entropic Rate Acceleration Induced by Solvent Dynamics in Membrane Enzymes
09:42

Unraveling Entropic Rate Acceleration Induced by Solvent Dynamics in Membrane Enzymes

Published on: January 16, 2016

Activation of enzymatic catalysis.

K Das-Panja1, V S Jonnalagadda, S Jonnalagadda

  • 1Department of Biochemistry, University College of Science, Osmania University, Hyderabad.

Indian Journal of Biochemistry & Biophysics
|July 20, 1999
PubMed
Summary
This summary is machine-generated.

Enzyme activation, crucial for cellular metabolism, is less understood than inhibition. This summary explores reversible enzyme activation mechanisms, including small molecule influence.

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Area of Science:

  • Biochemistry
  • Enzymology
  • Cellular Metabolism

Background:

  • Enzyme activity modulation is vital for cellular metabolism.
  • Inhibition of metabolic pathways is well-studied, but activation is less understood.
  • Enzyme activation mechanisms include irreversible proteolysis and reversible modifications.

Purpose of the Study:

  • To summarize known mechanisms of enzyme activation.
  • To highlight the role of small molecules in reversible enzyme activation.
  • To provide an overview of enzyme activation in cellular regulation.

Main Methods:

  • Literature review of enzyme activation studies.
  • Analysis of reversible and irreversible activation processes.
  • Focus on post-translational modifications and small molecule binding.

Main Results:

  • Irreversible activation occurs via limited proteolysis of zymogens.
  • Reversible activation involves post-translational modifications or small molecule binding.
  • Small molecules can influence enzyme binding and subsequent activation.

Conclusions:

  • Enzyme activation is a key regulatory process in cellular metabolism.
  • Understanding reversible activation, particularly by small molecules, is important.
  • Further research into enzyme activation mechanisms is warranted.