Fourier transform Raman approach to structural correlation in hemoglobin derivatives

In order to obtain information on the structural aspects of hemoglobin (Hb) , Fourier transform Raman (FT-R) measurements on various ferrous, ferric de rivatives and nickel reconstituted Kb (NiHb) has been made. FT-R spectra fo r these derivatives were obtained by laser excitation in the near infrared region (NIR) (1064 nm) whereby the wave-number region (600-1700 cm(-1)) rel ated to both porphyrin ring modes and some globin modes were monitored. Com parison of various modes was made based on previous resonance Raman (RR) re sults. The wave-number shifts with respect to changes in oxidation state an d spin state are very similar to those observed by RR. Additional bands at 1654, 1459, and 1003 cm(-1) for deoxyHb and at 1656, 1454, and 1004 cm(-1) for oxy Hb can be correlated to globin modes. The shift in the position of these bands for the binding of oxygen can be related to changes in conforma tion during the transformation. The presence of two distinct sites in NiHb could be monitored by the use of FT-R technique. (C) 1999 Elsevier Science B.V. All rights reserved.