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Conformational changes monitored by fluorescence study on reconstituted hemoglobins.

S Venkateshrao1, P T Manoharan

  • 1Department of Chemistry and Regional Sophisticated Instrumentation Center, Indian Institute of Technology, Madras, Chennai 600036, India.

Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
|August 6, 2004
PubMed
Summary

Intrinsic fluorescence revealed two distinct tryptophan environments in metal ion and hybrid hemoglobins. This structural heterogeneity suggests variations in the T-state character of hemoglobin subunits.

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Area of Science:

  • Biochemistry
  • Biophysics
  • Protein Chemistry

Background:

  • Hemoglobin (Hb) is a crucial protein for oxygen transport.
  • Understanding Hb structure-function relationships is vital.
  • Metal ion reconstitution offers insights into Hb dynamics.

Purpose of the Study:

  • To investigate the structural heterogeneity of reconstituted and hybrid hemoglobins.
  • To explore the microenvironments of tryptophan residues in modified Hbs.
  • To correlate fluorescence properties with hemoglobin quaternary structure.

Main Methods:

  • Intrinsic steady-state fluorescence spectroscopy at 296 nm excitation.
  • Deconvolution and Gaussian fitting of fluorescence emission spectra.
  • Analysis of metal ion and hybrid hemoglobin variants (e.g., Cu, Ni, CuNi, NiCu, CuFe-CO, NiFe-CO).

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Main Results:

  • Fluorescence spectra showed broad, asymmetric features for copper and nickel Hbs.
  • Deconvolution revealed two distinct peaks, indicating two tryptophan environments.
  • Hybrid hemoglobins exhibited similar spectral patterns with two prominent peaks.
  • The ratio of peak amplitudes correlated with the T-state character.

Conclusions:

  • The presence of two distinct tryptophan environments suggests structural heterogeneity among hemoglobin subunits.
  • Fluorescence spectroscopy effectively probes subunit structural differences in modified hemoglobins.
  • These findings support previous spectroscopic evidence on hemoglobin structural dynamics.