Stocks of ferricWT (as a negative control), T111H, and L75H CtrHbs
were prepared either from lyophilized protein, or, in the case of L75H
CtrHb, from freshly purified protein. A 5-fold excess of cyanide was
added to each sample, followed by 20–30 min incubation at room
temperature to ensure saturation of the heme site. An excess of DT
(200- to 500-fold for optical samples or 3- to 13-fold for NMR samples)
was then added to the solutions. Cyanomet CtrHb samples were
incubated for ~3–8 h (WT and T111H) or ~0.5–2 h (L75H) and then
oxidized by exposure to air or potassium ferricyanide. Aliquots of thetotal samples were saved at different stages of the process for optical
characterization.
Stocks of ferricWT (as a negative control), T111H, and L75H CtrHbs
were prepared either from lyophilized protein, or, in the case of L75H
CtrHb, from freshly purified protein. A 5-fold excess of cyanide was
added to each sample, followed by 20–30 min incubation at room
temperature to ensure saturation of the heme site. An excess of DT
(200- to 500-fold for optical samples or 3- to 13-fold for NMR samples)
was then added to the solutions. Cyanomet CtrHb samples were
incubated for ~3–8 h (WT and T111H) or ~0.5–2 h (L75H) and then
oxidized by exposure to air or potassium ferricyanide. Aliquots of thetotal samples were saved at different stages of the process for optical
characterization.
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