Evidence for hydrogen bonding of bound dioxygen to the distal histidine of oxycobalt myoglobin and haemoglobin
- 1 August 1982
- journal article
- Published by Springer Nature in Nature
- Vol. 298 (5877), 869-871
- https://doi.org/10.1038/298869a0
Abstract
The origin of the differences in oxygen binding energy in various haemoglobins and myoglobins has long been debated. Perutz proposed that the haem-coordinated histidine (proximal histidine) strains the haem iron in low affinity globins but relaxes it in high affinity globins. The existence of such tension in T-structure deoxyhaemoglobin (deoxyHb) was recently confirmed by electron paramagnetic resonance (EPR), resonance Raman and NRM spectroscopy. Although its contribution to the free energy of cooperativity is insignificant in the deoxy state, the tension at the haem is considered to be approximately 1 kcal mol-1 for the ligated form in which the haem iron moves into the porphyrin plane. The remaining free energy is probably stored in other parts of the molecule. Therefore, a study of the stabilization mechanisms of the oxygenated form became increasingly important. A hydrogen bond between the bound oxygen and the distal histidine has been proposed by Pauling; this would be expected to stabilize the oxy form of the protein and could contribute to the regulation of the oxygen affinity through the oxygen dissociation rate. A series of EPR and functional studies on various cobalt-substituted monomeric haemoglobins and myoglobins suggested the presence of such hydrogen bonding and it has recently been established in crystals of oxy iron myoglobin (oxyFeMb) and in oxyhaemoglobin. Here we present resonance Raman spectra of the oxy forms of cobalt--porphyrin-substituted myoglobin and haemoglobin (CoMb and CoHb) recorded in buffered H2O and D2O solutions at 406.7 nm excitation. Only the Raman lines corresponding to the O-O stretching mode of the bound oxygen, appearing near 1,130 cm-1, are shifted (2-5 cm-1) replacement of H2O by D2O; no other vibrations, including the Co--O2 stretching mode, exhibit any frequency shifts. This indicated that the bound oxygen in oxyCoMb and in both subunits of oxyCoHb interacts with the adjacent exchangeable proton, and confirms the formation of a hydrogen bond between the bound oxygen and the distal histidine.Keywords
This publication has 19 references indexed in Scilit:
- The iron–oxygen bond in human oxyhaemoglobinNature, 1982
- Subunit Inequivalence in Allosteric Constraints of Prosthetic Groups in T-State HemoglobinsPublished by Springer Nature ,1982
- Structural Changes at the Heme Induced by Freezing HemoglobinScience, 1981
- Neutron diffraction reveals oxygen–histidine hydrogen bond in oxymyoglobinNature, 1981
- Differences in Fe(II)-N epsilon(His-F8) stretching frequencies between deoxyhemoglobins in the two alternative quaternary structures.Proceedings of the National Academy of Sciences, 1980
- Interactions between the quaternary structure of the globin and the spin state of the heme in ferric mixed spin derivatives of hemoglobinBiochemistry, 1978
- Oxygenation and EPR spectral properties of Aplysia myoglobins containing cobaltous porphyrinsBiochimica et Biophysica Acta (BBA) - Protein Structure, 1978
- Studies on Cobalt Myoglobins and HemoglobinsPublished by Elsevier ,1974
- Stereochemistry of Cooperative Effects in Haemoglobin: Haem–Haem Interaction and the Problem of AllosteryNature, 1970
- Nature of the Iron–Oxygen Bond in OxyhæmoglobinNature, 1964