Ferriheme undecapeptide

Figure 8. Absorption spectrum of ferriheme undecapeptide (—) and of ferroheme undecapeptide (hemochromogen) (- ) in 0.05 M sodium tetraborate, pH 9. The right-hand ordinate is for the Soret (y) band and for the absorbances at wavelengths shorter than 210 nm. The hemochromogen bands are labelled a-s. As there are no residues in the undecapeptide with chromophores absorbing at wavelengths greater than 240 nm, the 280 nm, e and S bands are clearly due to the heme chromophore. Reproduced, with permission, from [11],...

Figure 10. Hyperchromisra of the heme Soret band of the ferriheme undecapeptide on association. Also observed is a shift of the band intensity to longer wavelengths (red shift). This corresponds to the example in Figure 5B and the head-to-tail (coplanar) orientation of Figure 7B. Reproduced, with permission, from [14].

---