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  • Title: Redox-linked spin-state changes in the di-haem cytochrome c-551 peroxidase from Pseudomonas aeruginosa.
    Author: Foote N, Peterson J, Gadsby PM, Greenwood C, Thomson AJ.
    Journal: Biochem J; 1985 Aug 15; 230(1):227-37. PubMed ID: 2996492.
    Abstract:
    Magnetic-c.d., e.p.r. and optical-absorption spectra are reported for the half-reduced form of Pseudomonas aeruginosa cytochrome c-551 peroxidase, a di-haem protein, and its fluoride derivative. Comparison of this enzyme species with oxidized peroxidase shows the occurrence of spin-state changes at both haem sites. The high-potential haem changes its state from partially high-spin to low-spin upon reduction. This is linked to a structural alteration at the ferric low-potential haem group, causing it to change from low-spin to high-spin. Low-temperature spectra demonstrate photolysis of an endogenous ligand of the high-potential haem. In addition, an inactive form of enzyme is examined in which the structural change at the ferric low-potential haem does not occur on reduction of the high-potential haem.
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