S. Itoh, Xin Huang, H. Kawakami, M. Komatsu, Y. Ohshiro, S. Fukuzumi
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An active site model for calcium(II)-containing quinoproteins
The Ca2+ complexes of PQQ-2, 9-dimethyl ester and its iminoquinone derivative have been synthesised and the reactivity towards alcohols examined; the oxidising ability of the quinone is significantly enhanced by binding Ca2+ and NH3, both of which are essential for quinoprotein methanol dehydrogenase activation.