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Iso-coenzyme A.

Kristi L Burns1, Leslie T Gelbaum, M Cameron Sullards

  • 1School of Chemistry and Biochemistry and the Petit Institute for Bioengineering and Biosciences, The Georgia Institute of Technology, Atlanta, Georgia 30332-0400, USA.

The Journal of Biological Chemistry
|February 15, 2005
PubMed
Summary
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Iso-coenzyme A (iso-CoA) is a structural isomer of coenzyme A. This study characterizes iso-CoA and its derivatives, revealing their role as substrates in enzymatic reactions and providing a new synthesis method.

Area of Science:

  • Biochemistry
  • Organic Chemistry

Background:

  • Iso-coenzyme A (iso-CoA) is an isomer of coenzyme A (CoA) where the monophosphate is attached to the 2'-carbon of the ribose ring.
  • Despite its early discovery, iso-CoA and its acylated forms have received limited research attention.
  • Previous characterizations relied on indirect methods like chromatography and assumptions about enzyme specificity.

Purpose of the Study:

  • To structurally characterize iso-CoA and its acylated derivatives (acetyl-iso-CoA, acetoacetyl-iso-CoA, beta-hydroxybutyryl-iso-CoA).
  • To develop a high-performance liquid chromatography (HPLC) method for separating CoA isomers.
  • To investigate the enzymatic activity of iso-CoA compounds and establish a synthesis method for iso-CoA.

Main Methods:

  • Mass spectrometry (MS) and tandem MS for structural analysis.

Related Experiment Videos

  • Homonuclear and heteronuclear NMR spectroscopy for detailed structural elucidation.
  • High-performance liquid chromatography (HPLC) for isomer separation.
  • Enzymatic assays to test substrate activity.
  • Beta-cyclodextrin-mediated synthesis of iso-CoA.

    • Main Results:

    • Comprehensive structural characterization of iso-CoA, acetyl-iso-CoA, acetoacetyl-iso-CoA, and beta-hydroxybutyryl-iso-CoA.
    • Development of an effective HPLC method for distinguishing CoA isomers.
    • Demonstration of iso-CoA compounds functioning as substrates in enzymatic acyl transfer reactions.
    • A regioselective synthesis of iso-CoA using beta-cyclodextrin and a proposed mechanism for iso-CoA formation in commercial CoA preparations.

    Conclusions:

    • Iso-CoA and its derivatives are structurally characterized and enzymatically active.
    • New methodologies for separation, synthesis, and characterization of iso-CoA are established.
    • These findings provide a foundation for exploring iso-CoA compounds as potential regulators (pseudo-substrates or inhibitors) of CoA-utilizing enzymes.