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An Improved Force Field for O2, CO and CN Binding to Metalloporphyrins

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Abstract

Parametrization of a molecular-mechanics program to include terms specific for five- and six-coordinate transition metal complexes is applied to heme complexes. The principal new feature peculiar to five and six coordination is a term that represents the effect of electron-pair repulsion modified by the ligand electronegativity and takes into account the different possible structures of complexes. The model system takes into account the structural differences of the fixing centre in the haemoglobin subunits. The customary proximal histidine is added. The macrocycle heme IX is wholly considered in our model. The calculations show clearly that certain conformations of heme IX–histidine models are much more favourable than others for fixing O2. From the O2 binding in haemoglobin and myoglobin and in simple Fe porphyrin models it is concluded that the bent O2 ligand is best viewed as bound superoxide, O2 −. Rotation of axial ligands are practically free. A small modification of the model in both crystal and protein matrix affects the orientation of the ligands in experimental systems.

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  1. Institut Universitari de Ciència Molecular, Universitat de València, Dr. Moliner 50, E-46100, Burjassot (València), Spain

    Francisco Torrens

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Torrens, F. An Improved Force Field for O2, CO and CN Binding to Metalloporphyrins. Journal of Inclusion Phenomena 49, 37–46 (2004). https://doi.org/10.1023/B:JIPH.0000031111.00613.4c

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