The computed distribution of copper(II) and zinc(II) ions among seventeen amino acids present in human blood plasma |
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| Authors: | P S Hallman D D Perrin and Ann E Watt |
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| Institution: | Department of Medical Chemistry, John Curtin School of Medical Research, Australian National University, Canberra, A.C.T. 2600, Australia |
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| Abstract: | The equilibrium distribution of copper(II) and zinc(II) ions among a mixture of 17 amino acids has been computed from stability-constant and blood-plasma-composition data. At pH7.4, 98% of the copper(II) in the simulated plasma solution is co-ordinated to histidine and cystine, predominantly as the mixed-ligand complexes Cu.His.Cystine](-) and Cu.H.His.Cystine]. Approximately half of the zinc(II) is co-ordinated to cysteine and histidine, but appreciable complex-formation occurs with most of the other amino acids. Stability constants are given for copper(II) and zinc(II) amino acid complexes, including some mixed-ligand species, at 37 degrees C and I=0.15m. |
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