Abstract

Methanol dehydrogenase is a bacterial quinoprotein containing PQQ at its active site, which is in the centre of a superbarrel structure made up of eight beta-sheets arranged radially as the blades of a propeller. A series of novel tryptophan-docking interactions between the beta-sheets make planar, stabilizing girdles around the periphery of the protein. The tryptophan residues form stacking interactions, and hydrogen bonds through their indole ring NH groups.

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