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Determination of fe-ligand bond lengths and the fe-n-o bond angles in soybean ferrous and ferric nitrosylleghemoglobin alpha using multiple-scattering xafs analyses

Academic Article
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Overview

authors

  • Rich, A. M.
  • Ellis, P. J.
  • Tennant, L.
  • Wright, Peter
  • Armstrong, R. S.
  • Lay, P. A.

publication date

  • December 1999

journal

  • Biochemistry  Journal

abstract

  • The NO adducts of leghemoglobin (Lb) are implicated in biological processes, but only the adduct with ferrous Lb (Lb(II)NO) has been characterized previously. We report the first characterization of ferric nitrosylleghemoglobin (Lb(III)NO) and XAS experiments performed on frozen aqueous solutions of Lb(II)NO and Lb(III)NO at 10 K. The XANES and electronic spectra of the NO adducts are similar in shape and energies to the myoglobin (Mb) analogues. The environment of the Fe atom has been refined using multiple-scattering (MS) analyses of the XAFS data. For Lb(II)NO, the MS analysis resulted in an averaged Fe-N(p)(pyrrole) distance of 2.02 A, an Fe-N(epsilon)(imidazole) distance of 1.98 A, an Fe-N(NO) distance of 1.77 A, and an Fe-N-O angle of 147 degrees. The Fe-N(NO) distance and Fe-N-O angle obtained from the analysis of Lb(II)NO are in good agreement with those determined crystallographically for [Fe(TPP)(NO)] (TPP, tetraphenylporphyrinato), with and without 1-methylimidazole (1-MeIm) as the sixth ligand, and the MS XAFS structures reported previously for the myoglobin (Mb(II)NO) analogue and [Fe(TPP)(NO)]. The MS analysis of Lb(III)NO yielded an average Fe-N(p) distance of 2.00 A, an Fe-N(epsilon) distance of 1.89 A, an Fe-N(NO) distance of 1.68 A, and an Fe-N-O angle of 173 degrees. These bond lengths and angles are consistent with those determined previously for the myoglobin analogue (Mb(III)NO) and the crystal structures of the model complexes, [Fe(III)(TPP)(NO)(OH(2))](+) and [Fe(OEP)(NO)](+) (OEP, octaethylporphyrinato). The final XAFS R values were 16.1 and 18.2% for Lb(II)NO and Lb(III)NO, respectively.

subject areas

  • Data Interpretation, Statistical
  • Ferric Compounds
  • Ferrous Compounds
  • Fourier Analysis
  • Iron
  • Leghemoglobin
  • Ligands
  • Monte Carlo Method
  • Nitrogen
  • Oxygen
  • Photochemistry
  • Reproducibility of Results
  • Scattering, Radiation
  • Soybeans
  • Spectrum Analysis
  • X-Rays
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Identity

International Standard Serial Number (ISSN)

  • 0006-2960

Digital Object Identifier (DOI)

  • 10.1021/bi990730n

PubMed ID

  • 10600110
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Additional Document Info

start page

  • 16491

end page

  • 16499

volume

  • 38

issue

  • 50

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