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- W1531736160 abstract "Resonance Raman spectra of the ferrous CO complex of cytochrome P-450cam have been observed both in its camphor-bound and free states. Upon excitation at 457.9 nm, near the absorption maximum of the Soret band, the ferrous CO complex of the camphor-bound enzyme showed an anomalously intense Raman line at 481 cm-1 besides the strong Raman lines at 1366 and 674 cm-1 for the porphyrin vibrations. The Raman line at 481 cm-1 (of the 12C16O complex) shifted to 478 cm-1 upon the substitution by 13C16O and to 473 cm-1 by 12C18O without any detectable shift in porphyrin Raman lines. This shows that the line at 481 cm-1 is assignable to Fe-CO stretching vibration. By the excitation at 457.9 nm, a weak Raman line was also observed at 558 cm-1, which was assigned to the Fe-C-O bending vibration, because it was found to shift by -14 cm-1 on 13C16O substitution while only -3 cm-1 on 12C18O substitution. These stretching and bending vibrations of the Fe-CO bond were not detected with the excitation at 413.1 nm, though the porphyrin Raman lines at 1366 and 674 cm-1 were clearly observed. When the substrate, camphor, was removed from the enzyme, the Fe-CO stretching vibration was found to shift to 464 cm-1 from 481 cm-1, while no detectable changes were found in porphyrin Raman lines. This means that the bound substrate interacts predominantly with the Fe-CO portion of the enzyme molecule." @default.
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- W1531736160 date "1985-02-01" @default.
- W1531736160 modified "2023-10-16" @default.
- W1531736160 title "The resonance Raman frequencies of the Fe-CO stretching and bending modes in the CO complex of cytochrome P-450cam." @default.
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- W1531736160 doi "https://doi.org/10.1016/s0021-9258(18)89508-4" @default.
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