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Pàgina inicial > Articles > Articles publicats > The evolutionary advantage of an aromatic clamp in plant family 3 glycoside exo-hydrolases |
Data: | 2022 |
Resum: | In the barley β-D-glucan glucohydrolase, a glycoside hydrolase family 3 (GH3) enzyme, the Trp286/Trp434 clamp ensures β-D-glucosides binding, which is fundamental for substrate hydrolysis during plant growth and development. We employ mutagenesis, high-resolution X-ray crystallography, and multi-scale molecular modelling methods to examine the binding and conformational behaviour of isomeric β-D-glucosides during substrate-product assisted processive catalysis that operates in GH3 hydrolases. Enzyme kinetics reveals that the W434H mutant retains broad specificity, while W434A behaves as a strict (1,3)-β-D-glucosidase. Investigations of reactant movements on the nanoscale reveal that processivity is sensitive to mutation-specific alterations of the tryptophan clamp. While wild-type and W434H utilise a lateral cavity for glucose displacement and sliding of (1,3)-linked hydrolytic products through the catalytic site without dissociation, consistent with their high hydrolytic rates, W434A does not adopt processive catalysis. Phylogenomic analyses of GH3 hydrolases disclose the evolutionary advantage of the tryptophan clamp that confers broad specificity, high catalytic efficiency, and processivity. |
Ajuts: | Agencia Estatal de Investigación PID2020-118893GB-I00 Agencia Estatal de Investigación MDM-2017-0767 European Commission 951231 Ministerio de Economía y Competitividad BES-2012-051782 Agencia Estatal de Investigación PRE2019-088412 Agencia Estatal de Investigación PID-2020-116861GB-I00 Agencia Estatal de Investigación PGC2018-098592-B-I00 |
Drets: | Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original. |
Llengua: | Anglès |
Document: | Article ; recerca ; Versió publicada |
Matèria: | Enzyme mechanisms ; X-ray crystallography ; Molecular evolution ; Glycosides ; Molecular biophysics |
Publicat a: | Nature communications, Vol. 13 (September 2022) , art. 5577, ISSN 2041-1723 |
19 p, 5.7 MB |