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Related Concept Videos

Catalytically Perfect Enzymes01:07

Catalytically Perfect Enzymes

The theory of catalytically perfect enzymes was first proposed by W.J. Albery and J. R. Knowles in 1976. These enzymes catalyze biochemical reactions at high-speed. Their catalytic efficiency values range from 108-109 M-1s-1. These enzymes are also called 'diffusion-controlled' as the only rate-limiting step in the catalysis is that of the substrate diffusion into the active site. Examples include triose phosphate isomerase, fumarase, and superoxide dismutase.
Catalysis02:50

Catalysis

The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
Catalysis01:27

Catalysis

Catalysis influences the rate of chemical reactions by providing an alternative reaction pathway with lower activation energy. A catalyst speeds up a reaction, but it is not consumed during the process. The fundamental principle of catalysis is the ability of a catalyst to alter the reaction mechanism, often introducing a more efficient pathway than the uncatalyzed process.In a catalyzed reaction, the catalyst participates directly in the reaction mechanism. It interacts with reactants to form...
Introduction to Enzymes01:22

Introduction to Enzymes

The use of enzymes by humans dates to 7000 BCE. Humans first used enzymes to ferment sugars and produce alcohol without knowing that this was an enzyme-catalyzed reaction. Wilhelm Kuhne coined the term 'enzyme' in 1877 from the Greek words ‘en’ meaning ‘in’ or ‘within’ and ‘zyme’ meaning ‘yeast.’
Most enzymes are proteins that speed up biochemical reactions without being consumed. Enzymes contain one or more active sites that bind the substrates and convert them into products. Many enzymes also...
Introduction To Enzymes01:22

Introduction To Enzymes

The use of enzymes by humans dates to 7000 BCE. Humans first used enzymes to ferment sugars and produce alcohol without knowing that this was an enzyme-catalyzed reaction. Wilhelm Kuhne coined the term 'enzyme' in 1877 from the Greek words ‘en’ meaning ‘in’ or ‘within’ and ‘zyme’ meaning ‘yeast.’
Most enzymes are proteins that speed up biochemical reactions without being consumed. Enzymes contain one or more active sites that bind the substrates and convert them into products. Many enzymes also...
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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Classical catalase: ancient and modern.

Peter Nicholls1

  • 1Department of Biological Sciences, University of Essex, Colchester Essex CO4 3SQ, UK. pnicholl@essex.ac.uk

Archives of Biochemistry and Biophysics
|February 14, 2012
PubMed
Summary
This summary is machine-generated.

Catalase, identified in 1902, has a complex catalytic mechanism. Modern research reveals its crucial role in redox protection for all life, challenging the

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Area of Science:

  • Biochemistry and enzymology
  • Molecular biology
  • Cellular redox processes

Background:

  • Historical challenges in elucidating catalase's kinetic mechanism since its 1902 identification.
  • The pivotal 1947 analysis by Chance et al. that identified peroxide compounds I and II.
  • Understanding the role of protons in forming these key ferryl complexes.

Observation:

  • Current challenges in active site binding of inhibitory ligands and hydrogen donors, particularly formate.
  • Defense of a prior mechanism for NADPH-dependent catalase protection against substrate inhibition.
  • A revised model connecting catalatic activity with one-electron side reactions involving compound II.

Findings:

  • Proton involvement in the formation of catalase peroxide compounds I and II.
  • NADPH-dependent protection against substrate inhibition is a valid mechanism.
  • A new model integrates catalytic and side reactions of catalase.

Implications:

  • Catalase is not a 'fossil enzyme' but plays a central role in cellular redox homeostasis.
  • Understanding catalase mechanisms is vital for human and prokaryotic/eukaryotic life.
  • Potential therapeutic targets for diseases involving oxidative stress.