Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 59, Issue 46, Pages 20508-20514Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202003236
Keywords
dynamics; glycosidases; ligand binding; NMR spectroscopy; rigid fold
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Funding
- NWO research school NRSCB [022.004.027]
- Wellcome Trust (WT) [206409/Z/17/Z.]
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The single-domain GH11 glycosidase fromBacillus circulans(BCX) is involved in the degradation of hemicellulose, which is one of the most abundant renewable biomaterials in nature. We demonstrate that BCX in solution undergoes minimal structural changes during turnover. NMR spectroscopy results show that the rigid protein matrix provides a frame for fast substrate binding in multiple conformations, accompanied by slow conversion, which is attributed to an enzyme-induced substrate distortion. A model is proposed in which the rigid enzyme takes advantage of substrate flexibility to induce a conformation that facilitates the acyl formation step of the hydrolysis reaction.
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