
Our research group focuses on advancing knowledge of structure-function relationships in enzymes to facilitate enzyme modification for specific purposes. Enzyme modification is a growing field in response to policies promoting environmentally friendly catalysts. Our approach involves combinatorial mutagenesis of enzyme active sites, selecting enzymes through accelerated evolution, and characterizing them using kinetic and structural analyses, as well as computer-assisted molecular modeling. Our work also aims to better understand enzyme-induced drug resistance in the health sciences sector. Our interdisciplinary work in bio-organic chemistry, biochemistry, and bioinformatics contributes to the development of modern enzymology.
Cytochromes P450 oxidize hydrophobic compounds to increase an organism's ability to eliminate these compounds. The oxidation reactions they catalyze have great potential for biocatalytic applications. To this end, we are experimentally adapting the Bacillus megaterium cytochrome P450 to catalyze industrially relevant reactions.
Dihydrofolate reductases (Dfr) are essential for cell proliferation. Therefore, they are the target of the antibiotic trimethoprim. The emergence of an alternative Dfr, Type B Dfr (DfrB), confers insurmountable resistance to trimethoprim. We investigate the evolution and function of this enzyme by combining bioinformatics and experimental methods to inform our design of DfrB-specific inhibitors.
Congratulations to Dr Douglas Fansher, Dr Ahmad Salehi and Stella Cellier-Goetghebeur for winning a poster presentation prize at the PROTEO Symposium 2026! Dr Douglas Fansher will also be starting his lab at Wilfrid Laurier University in Fall 2026.
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Congratulations to Jonathan Besna for successfully defending his PhD thesis!
The Pelletier lab is happy to welcome a new master's student, Marie-Claire Gobeil, and a new PhD student, Tom Descours--Mussati. Marie-Claire and Tom will work on the DfrB project.
'Recent advances in oxidative biocatalysis: From natural reactivity to new-to-nature transformations' was published in Current Opinion in Green and Sustainable Chemistry.
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Dr Douglas Fansher and Dr Joelle Pelletier also contributed to the 'Protein engineering: status report' collaborative review in honor of the 40th anniversary of Protein Engineering, Design and Selection (PEDS).
'Indigo Formation as a Predictor of Non-Native Aromatic Hydroxylation in Cytochrome P450 BM3' was published in ACS Catalysis.
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'From binding to catalysis: emergence of a rudimentary enzyme conferring intrinsic antibiotic resistance' was published in Molecular Biology and Evolution.
ADRESSE / ADDRESS
Université de Montréal
Département de Chimie
Campus MIL - Local B-6227
1375 Ave.Thérèse-Lavoie-Roux
Montreal, Qc, Canada, H2V 0B3
CONTACT
Phone: +1 (514) 343-2124
Fax: +1 (514) 343-7586
@ : joelle.pelletier@umontreal.ca