Fig. 3.
UV/visible spectrum of F417S recombinant human ferrochelatase. The spectrum of purified recombinant F417S ferrochelatase in elution buffer7 was obtained with a Varian 219 spectrophotometer. Not present are characteristic features resulting from the [2Fe-2S] cluster, which are normally present at 460 nm, 420 nm, and 325 nm in spectra from the wild-type protein.14 A minor absorbance peak at 410 nm is attributed to small amounts of residually bound porphyrin.