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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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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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The energy released from the breakdown of the chemical bonds within nutrients can be stored either through the reduction of electron carriers or in the bonds of adenosine triphosphate (ATP). In living systems, a small class of compounds functions as mobile electron carriers, molecules that bind to and shuttle high-energy electrons between compounds in pathways. The principal electron carriers that will be considered originate from the B vitamin group and are derivatives of nucleotides; they are...
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Coenzyme A: back in action.

Roberta Leonardi1, Yong-Mei Zhang, Charles O Rock

  • 1Department of Infectious Diseases, St. Jude Children's Research Hospital, 332 N. Lauderdale, Memphis, TN 38105-2794, USA.

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This summary is machine-generated.

Coenzyme A (CoA) biosynthesis is vital for carboxylic acid metabolism. Recent advances in genetics and enzymology highlight its role in antibacterial drug discovery and neurodegenerative disorders.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Genetics

Background:

  • Coenzyme A (CoA) is an essential cofactor in carboxylic acid metabolism, including fatty acids.
  • The genes and protein structures for CoA biosynthesis enzymes are increasingly understood.
  • Pathway intermediates are conserved across prokaryotes and eukaryotes.

Purpose of the Study:

  • To review and integrate current knowledge on Coenzyme A biosynthesis.
  • To highlight recent findings in genetics, enzymology, and regulation.
  • To cover CoA biosynthesis in bacteria, plants, and mammals.

Main Methods:

  • Comparative genomics to identify sequence differences in enzymes.
  • Review of genetic and enzymological data.
  • Integration of existing literature and recent discoveries.

Main Results:

  • All genes for CoA biosynthetic enzymes have been identified.
  • Structural information for several pathway proteins is available.
  • Significant sequence variations exist between prokaryotic and eukaryotic enzymes despite conserved biochemistry.

Conclusions:

  • Coenzyme A biosynthesis is a promising target for novel antibacterial drugs.
  • Mutations in pantothenate kinase are linked to human neurodegenerative diseases.
  • Understanding CoA biosynthesis is crucial for both fundamental science and therapeutic development.