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Fundamental molecular differences between alcohol dehydrogenase classes

O Danielsson1, S Atrian, T Luque

  • 1Department of Medical Biochemistry and Biophysics, Karolinska Institutet, Stockholm, Sweden.

Proceedings of the National Academy of Sciences of the United States of America
|May 24, 1994
PubMed
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Researchers identified a medium-chain alcohol dehydrogenase in Drosophila, bridging a gap in enzyme distribution. This conserved class III enzyme plays a crucial role in cellular metabolism.

Area of Science:

  • Biochemistry
  • Enzymology
  • Molecular Biology

Background:

  • Alcohol dehydrogenases (ADHs) exist in two main families: medium-chain (zinc enzymes) and short-chain.
  • Medium-chain ADHs are found in various organisms, but were thought to be absent in insects.
  • Insects were believed to possess only short-chain ADHs.

Purpose of the Study:

  • To characterize a medium-chain alcohol dehydrogenase in Drosophila.
  • To investigate the evolutionary distribution and functional conservation of medium-chain ADHs.
  • To compare the properties of Drosophila medium-chain ADH with other known ADH classes.

Main Methods:

  • Biochemical characterization of the identified Drosophila enzyme.
  • Sequence and structural comparison with human medium-chain ADH.

Related Experiment Videos

  • Analysis of enzymatic properties, including substrate specificity and kinetic parameters.
  • Gene expression analysis across different developmental stages.

    • Main Results:

    • A medium-chain alcohol dehydrogenase (class III ADH) was identified in Drosophila, identical to insect octanol dehydrogenase.
    • The Drosophila enzyme shows high residue identity (70%) to human class III ADH, with conserved substrate/coenzyme interaction sites.
    • Key differences, such as Phe-51 and extra residues near position 250, influence coenzyme binding and activity.
    • The enzyme exhibits low activity toward ethanol but high selectivity for formaldehyde/glutathione.
    • mRNA expression is constitutive across all developmental stages.

    Conclusions:

    • The discovery bridges the gap in the known distribution of medium-chain alcohol dehydrogenases.
    • Establishes the class III enzyme as strictly conserved across diverse species, including insects.
    • Highlights the fundamental molecular differences between class III and class I ADHs.
    • Suggests a significant role for this conserved enzyme in cellular metabolism.