Temperature dependent spectral changes of iron and nickel hemoglobins and their derivatives.
Temperature dependent absolute and difference spectra for deoxy and oxy human hemoglobin, alpha and beta subunits, NiHbA, carboxypeptidase A treated deoxy HbA and NiHbA have been investigated. It is shown for the first time that the alpha subunits are mainly responsible for the temperature dependent spectral changes in the absorption spectra of Hb in the range from 0 degrees C to 40 degrees C. It has also been found that in the R state the spectral alterations caused by temperature variation are about 85% of those found for the T state of Hb. The value of following the temperature dependence of the porphyrin bands of hemoproteins, as a sensitive probe for subtle changes in the region of the heme, is demonstrated.
D006454:Hemoglobins; D006801:Humans; D007501:Iron; D009532:Nickel; D013053:Spectrophotometry; D013696:Temperature
D006454:Hemoglobins; D009532:Nickel; C100003:deoxyhemoglobin; D007501:Iron