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Elucidation of the Differences between the 430- and 455-nm Absorbing Forms of P450-Isocyanide Adducts by Resonance Raman Spectroscopy
Journal of Biological Chemistry
Alkylisocyanide adducts of microsomal P450 exist in two interconvertible forms, each giving the Soret maximum around 430 or 455 nm. This is demonstrated with a rabbit liver P450 2B4. Resonance Raman spectra of the 430-and 455-nm forms were examined for typical P450s of the two types as well as for P450 2B4 because the 430-nm form of P450 2B4 is liable to change into P420. P450cam and P450nor were selected as a model of the 430-and 455-nm forms, respectively. For the n-butyl isocyanide (CNBu)doi:10.1074/jbc.m104932200 pmid:11459844 fatcat:eqjigvossfb4ppstggnvj347am