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- W2043863639 abstract "The effects of ligands with various field strengths on the optical absorption spectrum of myeloperoxidase have been investigated. As is the case with other hemoproteins, the Soret peak in the optical absorption spectra at 77 K moves to longer wavelengths when strong-field ligands are present, whereas binding of such ligands as chloride and fluoride, which stabilize the high-spin state, shows the opposite effect. With a ligand of intermediate field strength, such as azide, the optical spectrum is not affected at room temperature, but lowering of the temperature results in the formation of the low-spin form of the enzyme. Similarly, in native myeloperoxidase a spin state equilibrium is found in which the low-spin state is favoured at high ionic strength and displays corresponding changes in the optical spectra. From the ligand- and the temperature-induced changes in the optical spectra of the ferric enzyme it is concluded that the band at 620–630 nm is an α band of the low-spin heme iron species, whereas the bands at 500 and 690 nm are probably ‘charge-transfer’ bands∗ of the heme with the iron in the high-spin state." @default.
- W2043863639 created "2016-06-24" @default.
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- W2043863639 date "1981-10-01" @default.
- W2043863639 modified "2023-10-03" @default.
- W2043863639 title "Spectral properties of myeloperoxidase and its ligand complexes" @default.
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- W2043863639 doi "https://doi.org/10.1016/0005-2744(81)90009-7" @default.
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