Abstract
Spectroscopic and chemical evidence speak in favour of the iron-oxygen bond being polar. X-ray analysis shows that the oxygen molecule is inclined at an angle of about 115° to the haem plane. Cooperative binding of oxygen by haemoglobin is attributable to an equilibrium between two alternative structures that differ in oxygen affinity by the equivalent of 3–3.5 kcal/mol. The author has proposed that in the low-affinity structure the globin opposes the movement of the iron atom from its pentacoordinated pyramidal geometry in the haem of deoxyhaemoglobin to its hexacoordinated planar geometry in the haem of oxyhaemoglobin, while in the high-affinity structure this restraint is absent. Recent evidence supporting this mechanism is described.
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© 1982 Plenum Press, New York
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Perutz, M.F. (1982). Nature of the Iron-Oxygen Bond and Control of Oxygen Affinity of the Haem by the Structure of the Globin in Haemoglobin. In: Bossa, F., Chiancone, E., Finazzi-Agrò, A., Strom, R. (eds) Structure and Function Relationships in Biochemical Systems. Advances in Experimental Medicine and Bioligy, vol 148. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-9281-5_4
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