Asymmetric sulfoxidation by engineering the heme pocket of a dye-decolorizing peroxidase
| Autor: | Cristina Coscolín, Marina Cañellas, Irene Davó-Siguero, Francisco J. Ruiz-Dueñas, Victor Guallar, Antonio A. Romero, Ángel T. Martínez, Dolores Linde, Fátima Lucas |
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| Přispěvatelé: | Ministerio de Economía y Competitividad (España), CSIC - Unidad de Recursos de Información Científica para la Investigación (URICI), Barcelona Supercomputing Center |
| Rok vydání: | 2016 |
| Předmět: |
0301 basic medicine
Stereochemistry Oxidació Catalysis Enzyme catalysis 03 medical and health sciences chemistry.chemical_compound Oxidation Peroxidase--Analysis Hemeproteins Heme Catalytic activities Oxidation reaction Dye decolorizing peroxidase biology Chemistry Enginyeria electrònica [Àrees temàtiques de la UPC] Proteins Active site Substrate (chemistry) 030104 developmental biology Dye-decolorizing peroxidases (DyPs) biology.protein Organic synthesis Enantiomer Proteïnes |
| Zdroj: | Recercat. Dipósit de la Recerca de Catalunya instname UPCommons. Portal del coneixement obert de la UPC Universitat Politècnica de Catalunya (UPC) 'Catalysis Science & Technology ', vol: 6, pages: 6277-6285 (2016) Digital.CSIC. Repositorio Institucional del CSIC |
| ISSN: | 2044-4761 2044-4753 |
| Popis: | The so-called dye-decolorizing peroxidases (DyPs) constitute a new family of proteins exhibiting remarkable stability. With the aim of providing them new catalytic activities of biotechnological interest, the heme pocket of one of the few DyPs fully characterized to date (from the fungus Auricularia auricula-judae) was redesigned based on the crystal structure available, and its potential for asymmetric sulfoxidation was evaluated. Chiral sulfoxides are important targets in organic synthesis and enzyme catalysis, due to a variety of applications. Interestingly, one of the DyP variants, F359G, is highly stereoselective in sulfoxidizing methylphenyl sulfide and methyl-p-tolyl sulfide (95–99% conversion, with up to 99% excess of the S enantiomer in short reaction times), while the parent DyP has no sulfoxidation activity, and the L357G variant produces both R and S enantiomers. The two variants were crystallized, and their crystal structures were used in molecular simulations to provide a rational explanation for the new catalytic activities. Protein energy landscape exploration (PELE) showed more favorable protein–substrate catalytic complexes for the above variants, with a considerable number of structures near the oxygen atom of the activated heme, which is incorporated into the substrates as shown in 18O-labeling experiments, and improved affinity with respect to the parent enzyme, explaining their sulfoxidation activity. Additional quantum mechanics/molecular mechanics (QM/MM) calculations were performed to elucidate the high stereoselectivity observed for the F359G variant, which correlated with higher reactivity on the substrate molecules adopting pro-S poses at the active site. Similar computational analyses can help introduce/improve (stereoselective) sulfoxidation activity in related hemeproteins. This work was supported by the INDOX (KBBE-2013-7-613549) EU project and by the BIO2014-56388-R (NOESIS), BFU2014- 55448-P and CTQ2013-48287-R projects of the Spanish Ministry of Economy and Competitiveness (MINECO). We cordially thank the staff at ID23-1 beamline (ESRF) and the BL13-XALOC beamline (ALBA). F. J. R.-D. acknowledges a MINECO Ramón & Cajal contract. We acknowledge support by the CSIC Open Access Publication Initiative through its Unit of Information Resources for Research (URICI) |
| Databáze: | OpenAIRE |
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