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Cofactors and Coenzymes01:27

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Enzymes require additional components for proper function. There are two such classes of molecules: cofactors and coenzymes. Cofactors are metallic ions and coenzymes are non-protein organic molecules. Both of these types of helper molecule can be tightly bound to the enzyme or bound only when the substrate binds.
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Enzymes are proteins made of amino acids. The functional group of each constituent amino acid catalyzes a wide variety of chemical reactions via ionic interactions or acid-base reactions. However, amino acids cannot catalyze oxidation-reduction and group transfer reactions and need to be aided by non-protein components called cofactors. Cofactors are also referred to as the chemical teeth of an enzyme.
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Related Experiment Video

Updated: Jan 28, 2026

EPR Monitored Redox Titration of the Cofactors of Saccharomyces cerevisiae Nar1
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Cofactor-mediated amyloidogenesis.

Jillian Madine1

  • 1Institute of Integrative Biology, University of Liverpool, Liverpool, U.K. j.madine@liv.ac.uk.

Bioscience Reports
|March 1, 2019
PubMed
Summary

Zinc and heparin initiate amyloid aggregation of GAPR-1 through a two-stage process. This involves a concentration step and conformational changes, revealing key insights into cofactor-protein interactions in amyloid diseases.

Keywords:
amyloidglycosaminoglycansmembrane-interactionsmetal ionsprotein aggregation

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A Protein Preparation Method for the High-throughput Identification of Proteins Interacting with a Nuclear Cofactor Using LC-MS/MS Analysis
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Area of Science:

  • Biochemistry
  • Structural Biology
  • Molecular Biology

Background:

  • Amyloidogenic aggregation of proteins is implicated in various diseases.
  • Cofactors like metal ions and glycosaminoglycans influence amyloid formation in vivo and in vitro.
  • Understanding cofactor-protein interactions is crucial for therapeutic interventions.

Purpose of the Study:

  • To elucidate the two-stage mechanism initiating the amyloidogenic aggregation cascade of Golgi-Associated plant Pathogenesis Related protein 1 (GAPR-1).
  • To investigate the roles of zinc binding and heparin in GAPR-1 conformational changes and aggregation.
  • To highlight the significance of subtle conformational changes in protein aggregation.

Main Methods:

  • The study focused on analyzing the aggregation process of GAPR-1.
  • Investigated the impact of zinc binding on GAPR-1 conformation.
  • Examined the role of heparin as a scaffold and concentration enhancer.

Main Results:

  • A two-stage process, involving concentration and conformational change, initiates GAPR-1 amyloidogenic aggregation.
  • Zinc binding induces a conformational change, enhancing amyloidogenic region accessibility.
  • Heparin acts as a template, increasing local protein concentration and facilitating aggregation.

Conclusions:

  • The study reveals a detailed mechanism for GAPR-1 amyloidogenic aggregation initiation.
  • Emphasizes the critical role of cofactors in modulating protein aggregation pathways.
  • Underscores the need for structural insights into cofactor-amyloid protein interactions for disease therapeutics.