Abstract
Berberine bridge enzyme catalyzes the conversion of (S)-reticuline to (S)-scoulerine by formation of a carbon-carbon bond between the N-methyl group and the phenolic ring. We elucidated the structure of berberine bridge enzyme from Eschscholzia californica and determined the kinetic rates for three active site protein variants. Here we propose a catalytic mechanism combining base-catalyzed proton abstraction with concerted carbon-carbon coupling accompanied by hydride transfer from the N-methyl group to the N5 atom of the FAD cofactor.
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Acknowledgements
We appreciate the support of staff scientists at the synchrotron beamlines at DESY/EMBL-Hamburg during diffraction data collection and of Hansjörg Weber (Institute of Organic Chemistry, Graz University of Technology) for recording the NMR spectra. Financial support was provided by the Austrian Science Fund (Fonds zur Förderung der wissenschaftlichen Forschung) through the Doktoratskolleg “Molecular enzymology” W901-B05 (to K.G. and P.M.).
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A.W., P.M. and K.G. designed experiments and analyzed results. A.W., P.M. and K.G. wrote the manuscript. A.W., A.L. and K.G. determined the crystal structures. A.W., S.R. and M.P. generated, expressed and purified mutant proteins. A.W. and M.P. performed enzyme kinetic experiments. T.M.K. prepared and provided special compounds and helped in editing the manuscript.
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Supplementary Figures 1–7, Supplementary Table 1, Supplementary Discussion and Supplementary Methods (PDF 749 kb)
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Winkler, A., Łyskowski, A., Riedl, S. et al. A concerted mechanism for berberine bridge enzyme. Nat Chem Biol 4, 739–741 (2008). https://doi.org/10.1038/nchembio.123
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DOI: https://doi.org/10.1038/nchembio.123
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