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Caenorhabditis elegans expresses a functional ArsA.

Yuen-Yi Tseng1, Chan-Wei Yu, Vivian Hsiu-Chuan Liao

  • 1Department of Bioenvironmental Systems Engineering, National Taiwan University, Taipei, Taiwan.

The FEBS Journal
|April 11, 2007
PubMed
Summary

Researchers identified a gene, asna-1, in C. elegans crucial for detoxifying arsenic (As(III)) and antimony (Sb(III)). This discovery reveals a conserved mechanism for metalloid detoxification extending from bacteria to animals.

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Area of Science:

  • Environmental Toxicology
  • Molecular Biology
  • Genetics

Background:

  • Arsenic is a prevalent environmental toxin requiring understanding of detoxification mechanisms.
  • In prokaryotes, arsenic detoxification relies on efflux systems encoded by operons.
  • Bacterial ArsA ATPase is key to the efflux pump for arsenite (As(III)) and antimonite (Sb(III)) resistance.

Purpose of the Study:

  • To identify and characterize a homolog of bacterial ArsA ATPase in the nematode Caenorhabditis elegans.
  • To investigate the role of this homolog, named asna-1, in metalloid detoxification and organismal tolerance.

Main Methods:

  • Identification of the asna-1 gene in C. elegans.
  • Comparative analysis of wild-type and asna-1-mutant nematode responses to As(III) and Sb(III).
  • Biochemical characterization of a purified maltose-binding protein (MBP)-ASNA-1 fusion protein.

Main Results:

  • asna-1 mutant nematodes exhibited increased sensitivity to As(III) and Sb(III) toxicity.
  • Purified ASNA-1 protein displayed ATPase activity dependent on As(III) or Sb(III).
  • As(III) and Sb(III) stimulated ASNA-1 ATPase activity by 2-fold and 4.6-fold, respectively.

Conclusions:

  • The asna-1 gene encodes a functional ArsA ATPase in C. elegans, essential for defense against As(III) and Sb(III).
  • This study demonstrates that As(III)- and Sb(III)-stimulated ArsA ATPase activity is conserved in animals, not limited to bacteria.
  • ASNA-1 plays a critical role in the intact organism's tolerance to these toxic metalloids.