Abstract
Heme oxygenase catalyzes the first step in the oxidative degradation of heme. The crystal structure of heme oxygenase-1 (HO-1) reported here reveals a novel helical fold with the heme sandwiched between two helices. The proximal helix provides a heme iron ligand, His 25. Conserved glycines in the distal helix near the oxygen binding site allow close contact between the helix backbone and heme in addition to providing flexibility for substrate binding and product release. Regioselective oxygenation of the α-meso heme carbon is due primarily to steric influence of the distal helix.
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Acknowledgements
Thanks to S. Tajbaksh for help with protein purification, to J.P. Cartailler for help with the GRASP figures, to B. Bhaskar, W.N. Lanzilotta, H. Li, C.S. Raman, I. Sevrioukova and M. Sundaramoorthy for helpful discussions, and to A. J. Greenwood for computational assistance. This work was supported by grants from the National Institutes of Health (T.L.P. and P.R.O.d.M.) and the National Science Foundation (T.L.P.).
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Schuller, D., Wilks, A., Ortiz de Montellano, P. et al. Crystal structure of human heme oxygenase-1. Nat Struct Mol Biol 6, 860–867 (1999). https://doi.org/10.1038/12319
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DOI: https://doi.org/10.1038/12319
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