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Introduction to Enzyme Kinetics01:19

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Enzyme kinetics studies the rates of biochemical reactions. Scientists monitor the reaction rates for a particular enzymatic reaction at various substrate concentrations. Additional trials with inhibitors or other molecules that affect the reaction rate may also be performed.
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Polarimetry finds application in chemical kinetics to measure the concentration and reaction kinetics of optically active substances during a chemical reaction. Optically active substances have the capability of rotating the plane of polarization of linearly polarized light passing through them—a feature called optical rotation. Optical activity is attributed to the molecular structure of substances. Normal monochromatic light is unpolarized and possesses oscillations of the electrical...
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Characterising Complex Enzyme Reaction Data.

Handan Melike Dönertaş1,2, Sergio Martínez Cuesta1, Syed Asad Rahman1

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Summary
This summary is machine-generated.

Enzyme Commission (EC) numbers, used to classify enzyme activity, are linked to multiple reactions, necessitating a re-evaluation of enzyme function and evolution. This study reveals complexity in enzyme classification, impacting accurate functional annotation.

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Area of Science:

  • Biochemistry
  • Bioinformatics
  • Enzymology

Background:

  • The Enzyme Commission (EC) number system classifies enzyme-catalyzed reactions.
  • Rapid advancements in understanding enzyme functions necessitate a review of the EC number system's complexity.
  • Existing secondary reaction databases (e.g., KEGG) show inconsistencies in EC number assignments.

Purpose of the Study:

  • To investigate the complexity of the relationship between EC numbers and enzyme-catalyzed reactions.
  • To analyze the accuracy of enzyme function annotation and evolutionary changes in enzyme function.

Main Methods:

  • A combined manual and computational analysis was performed.
  • Investigation focused on secondary reaction databases like KEGG.
  • Analysis identified EC numbers associated with multiple distinct reactions.

Main Results:

  • Approximately one-third of all known EC numbers are associated with more than one reaction.
  • Some EC numbers link to reactions involving different types of bond changes.
  • Complexity is often managed through generic, alternative, or partial reaction definitions.

Conclusions:

  • The EC number system exhibits significant complexity, with many numbers linked to multiple reactions.
  • This complexity impacts the accurate annotation of enzyme function.
  • Understanding this complexity is crucial for studying enzyme evolution and function.