Abstract
The enzymatic reduction of aquomethemoglobin A, A 1C, fluoro-methemoglobin A (high spin) and cyanomethemoglobin A (low spin) by NADH-methemoglobin reductase was studied in the presence and absence of IHP and NaCl. It is shown that at alkaline pH, IHP accelerates the rate of reduction of high spin methemoglobins only. This effect is specific for IHP and cannot be produced by NaCl, although NaCl does exert similar effect as IHP at acid pH. Blocking of the NH 2- termini of β-chains (Hb A 1C) does not alter the effect of IHP on methemoglobin reduction.
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More From: Biochemical and Biophysical Research Communications
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