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• W1590750995 startingPage "12772" @default.
• W1590750995 abstract "Resonance Raman spectra are reported for catalases from bovine liver, the ascomycete fungus Aspergillus niger, and the bacterium Micrococcus luteus. The vibrational frequencies of the oxidation-, spin-, and coordination number-sensitive spectral bands are indicative of high spin pentacoordinate hemes in the resting ferric enzymes of each of these organisms. This result is in accord with the crystal structure of bovine catalase (Fita, I., and Rossmann, M.G. (1985) J. Mol. Biol. 185, 21–37). In contrast, the crystallographic study of catalase from the ascomycete Penicillium vitale (Vainshtein, B. K., Melik-Adamyan, W. R., Barynin, V. V., Vagin, A.A., Grebenko, A. I., Borisov, V. V., Bartels, K. S., Fita, I., and Rossmann, M. G. (1986) J. Mol. Biol. 188, 49–61) showed electron density on the distal side of the heme which could imply the presence of a sixth ligand, possibly a water molecule. However, both of these crystallographic studies showed the proximal ligand in catalase to be a tyrosine. The present study confirms tyrosinate coordination in each of the three catalases from the appearance of selected resonance-enhanced tyrosine vibrational modes. The most characteristic band is the tyrosinate ring mode at ∼ 1612 cm−1 which is maximally enhanced with 488.0 nm excitation. The appearance of tyrosinate modes at 1607 and 1245 cm−1 in the resonance Raman spectra of M. luteus cyano catalase serves to identify tyrosine as an axial ligand in bacterial as well as eukaryotic catalases. Unlike non-heme iron tyrosinate proteins, whose resonance Raman spectra are dominated by several intense bands diagnostic of tyrosine ligation, the heme-linked tyrosine modes are not easily distinguished from the large number of porphyrin vibrations." @default.
• W1590750995 created "2016-06-24" @default.
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• W1590750995 date "1989-08-01" @default.
• W1590750995 modified "2023-10-16" @default.
• W1590750995 title "Comparative Spectral Analysis of Mammalian, Fungal, and Bacterial Catalases" @default.
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• W1590750995 doi "https://doi.org/10.1016/s0021-9258(18)51552-0" @default.
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