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The Structural Characterization of Amavadin.

Robert E Berry1, Elaine M Armstrong1, Roy L Beddoes1

  • 1Department of Chemistry, University of Manchester, Manchester, M13 9PL (UK), Fax: (+44) 161-275-4616.

Angewandte Chemie (International Ed. in English)
|May 2, 2018
PubMed
Summary

Fly agaric accumulate vanadium in amavadin, a compound featuring a vanadium (VIV) center with specific ligands. The study elucidates amavadin's chiral structure and its interactions with other molecules.

Keywords:
AmavadinBioinorganic chemistryChiralityNatural productsStructure elucidationVanadium

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Area of Science:

  • Biochemistry
  • Inorganic Chemistry
  • Mycology

Background:

  • The fly agaric mushroom (Amanita muscaria) is known to accumulate vanadium.
  • Vanadium accumulation occurs in the form of a unique complex called amavadin.
  • Understanding the structure of amavadin is crucial for comprehending vanadium biochemistry in fungi.

Purpose of the Study:

  • To elucidate the crystal structure of amavadin.
  • To characterize the coordination chemistry of vanadium within the amavadin complex.
  • To investigate the stereochemistry and potential interactions of amavadin.

Main Methods:

  • X-ray crystallography was used to determine the precise three-dimensional structure of amavadin.
  • Spectroscopic methods were employed to confirm the oxidation state and coordination environment of the vanadium center.
  • Analysis of ligand structure and coordination modes was performed.

Main Results:

  • The crystal structure reveals a vanadium (VIV) center coordinated by two (S,S)-hidpa3- ligands.
  • Each ligand binds through one η2 -NO- group and two unidentate carboxylato groups.
  • The arrangement of the ligands creates a chiral vanadium center, observed in both Λ and Δ configurations.
  • Carboxylato groups are involved in binding cations like Ca2+ and hydrogen bonding.

Conclusions:

  • The structure of amavadin has been definitively elucidated, revealing its intricate coordination complex.
  • Amavadin possesses a chiral vanadium center, indicating stereochemical complexity.
  • The elucidated structure provides insights into how vanadium is sequestered and potentially interacts within biological systems.