Summary
Vitreoscilla contained a homodimeric bacterial hemoglobin (VtHb). The purification of this protein yielded VtmetHb which exhibited electronic and electron paramagnetic resonance (EPR) spectra, showing that it existed predominantly in a high-spin ferric form, both axial and rhombic components being present. The preparations also contained variable amounts of low-spin components. There was no evidence that these high-spin and low-spin forms were in equilibrium. The former were reducible by NADH catalyzed by the NADH-metVtHb reductase, and the latter were not. High ionic strength and high pH led to the formation of low-spin metVtHb; both treatments were reversible. Cyanide and imidazole liganded to VtHb resulted in the conversion of high-spin to low-spin ferric heme centers, each with characteristic electronic and EPR spectra. Some preparations of VtHb exhibited EPR signals consistent with a sulfur ligand bound to the ferric site. When VtHb was treated with NADH plus the reductase in the presence of oxygen, the intensity of the high-spin EPR signals decreased significantly. No reduction occurred in the absence of oxygen, suggesting a possible role for the superoxide anion. Dithionite treatment of VtHb resulted in a slow reduction, but the main product of the reaction of dithionite-reduced VtHb with oxygen was VtmetHb, not VtHbO2. EPR spectra of whole cells ofVitreoscilla exhibited a variety of intense signals at low and high magnetic field, theg-values being consistent with the presence of high-spin ferric heme proteins, in addition to an iron-containing superoxide dismutase (FeSOD) and iron-sulfur proteins. EPR spectra of the cytosol fraction ofVitreoscilla showed the expected resonances for VtmetHb and FeSOD.
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Abbreviations
- A :
-
absorbance
- DEAE:
-
diethylaminoethyl
- EDTA:
-
ethylenediamine tetraacetate
- EPR:
-
electron paramagnetic resonance
- HiPIP:
-
high-potential iron protein
- SDS:
-
sodium dodecyl sulfate
- SOD:
-
superoxide dismutase
- VtHb:
-
Vitreoscilla hemoglobin
- VtmetHb:
-
oxidizedVitreoscilla hemoglobin
- VtHbO2 :
-
oxygenatedVitreoscilla hemoglobin
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Kroneck, P.M.H., Jakob, W., Webster, D.A. et al. Studies on the bacterial hemoglobin fromVitreoscilla . Biol Metals 4, 119–125 (1991). https://doi.org/10.1007/BF01135389
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DOI: https://doi.org/10.1007/BF01135389