Jan 25, 1976

Carbon 13 resonances of 13CO2 carbamino adducts of alpha and beta chains in human adult hemoglobin

The Journal of Biological Chemistry
J S MorrowF R Gurd

Abstract

The principal component of normal adult human hemoglobin Ao, was equilibrated under various conditions with 13CO2. In addition, derivatives containing specifically carbamylated NH2-terinal groups in alpha or beta chains, or both, were prepared by treatment with cyanate, and equilibrated likewise to allow the identification of specific resonances observed by 13C nuclear magnetic resonance. In deoxyhemoglobin, a resonanance at 29.2 ppm upfield of external CS2 was assigned to the alpha chain terminal adduct, and one at 29.8 ppm to the beta chain terminal adduct. In the liganded state as the CO derivative, the terminal adduct on both chains showed a common resonance position at 29.8 ppm. Small effects of pH on the resonance positions were observed. Under certain conditions, a resonance was observed at 33.4 ppm, probably not ascribable to a carbamino compound. A carbamino resonance that became prominent at higher pH was found at 28.4 ppm, and is tentatively ascribed to one or more adducts on epsilon amino groups. The beta chain resonances in particular are minimized by the presence of inositol hexaphosphate or 2,3-diphosphoglycerate. Quantitative analysis of the resonance intensities shows that the effects of conversion from the deo...Continue Reading

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Mentioned in this Paper

In Vivo NMR Spectroscopy
Deoxyhemoglobin
Derivatives
Magnetic Resonance Imaging
Adduct
Plasma Protein Binding Capacity
Carboxyhemoglobin C
Hemoglobin Measurement
Eryhem
Protein Conformation

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