Distal residues in the oxygen binding site of haemoglobin studied by protein engineering (original) (raw)

Nature volume 329, pages 858–860 (1987)Cite this article

Abstract

The geometries of the Fe–O2 and Fe–CO bonds in myoglobin and haemoglobin differ significantly from those in free porphyrin model compounds1–6. It has been suggested that steric hindrance by Val-Ell and His-E7 and a hydrogen bond between His-E7 and oxygen2,4,7 affect the geometry and electronic state of the Fe-ligand bond, and that these interactions may be important in controlling oxygen affinity8. We have produced mutant haemoglobins in _E. coli_9–11 having Val(67β)E11 replaced by Ala, Met, Leu or Ile and His(58β)E7 by Gin, Val or Gly. We have studied the effect of these mutations on the equilibrium and kinetics of ligand binding. The conformation of the new side chains and their effect on the protein structure have been examined by X-ray crystallography, and the vibrational properties of the Fe–CO bond observed by resonance Raman spectroscopy12. We found that the steric hindrance of ligand binding by the E11 residue and the polarity of the E7 residue in the β subunit are critical for fine-tuning ligand affinity.

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Author notes

  1. B. Luisi
    Present address: Department of Biochemistry and Molecular Biology, University of Chicago, Chicago, Illinois, 60637, USA
  2. D. Shih
    Present address: Department of Biochemistry, Oregon Health Sciences University, Portland, Oregon, 97201, USA
  3. G. Miyazaki
    Present address: Department of Biophysics, Faculty of Engineering Science, Osaka University, Toyonaka, 560, Japan
  4. K. Imai
    Present address: Department of Physico-chemical Physiology, Osaka University Medical School, Osaka, 530, Japan

Authors and Affiliations

  1. MRC Laboratory of Molecular Biology, Hills Road, Cambridge, CB2 2QH, UK
    K. Nagai, B. Luisi, D. Shih, G. Miyazaki & K. Imai
  2. INSERM Unite 299, 78 rue du Général Leclerc, 94274, Le Kremlin-Bicêtre, France
    C. Poyart
  3. Department of Medicine and Biochemistry, State University of New York at Buffalo, Veterans Administration Medical Center, Buffalo, New York, 14215, USA
    A. De Young, L. Kwiatkowsky & R. W. Noble
  4. School of Chemistry, Georgia Institute of Technology, Atlanta, Georgia, 30332, USA
    S.-H. Lin & N.-T. Yu
  5. Department of Biochemistry and Molecular Biology, University of Chicago, Chicago, Illinois, 60637, USA
    D. Shih, G. Miyazaki & K. Imai

Authors

  1. K. Nagai
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  2. B. Luisi
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  3. D. Shih
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  4. G. Miyazaki
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  5. K. Imai
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  6. C. Poyart
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  7. A. De Young
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  8. L. Kwiatkowsky
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  9. R. W. Noble
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  10. S.-H. Lin
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  11. N.-T. Yu
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Nagai, K., Luisi, B., Shih, D. et al. Distal residues in the oxygen binding site of haemoglobin studied by protein engineering.Nature 329, 858–860 (1987). https://doi.org/10.1038/329858a0

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