@article{Goux2023.04.11.536264,

title = {Sucrose phosphorylase from Alteromonas mediterranea: structural insight into the regioselective α-glucosylation of (+)-catechin},

author = {Marine Goux and Marie Demonceaux and Johann Hendrickx and Claude Solleux and Emilie Lormeau and Folmer Fredslund and David Tezé and Bernard Offmann and Corinne André-Miral},

url = {https://www.biorxiv.org/content/early/2023/04/11/2023.04.11.536264},

doi = {10.1101/2023.04.11.536264},

year  = {2023},

date = {2023-04-11},

urldate = {2023-04-11},

journal = {bioRxiv},

publisher = {Cold Spring Harbor Laboratory},

abstract = {Flavonoids glycosylation at different positions is paramount to solubility and modulation of bioactivities. Sucrose phosphorylases, through transglycosylation reactions, are interesting enzymes that can transfer glucose from sucrose, the donor substrate, onto polyphenols to form glycoconjugates. Here, we report for the first time the structural and enzymatic properties of sucrose phosphorylase from the marine bacteria Alteromonas mediterranea (AmSP). We characterized and investigated the transglucosylation capacity of two new variants of the enzyme on (+)-catechin and their propensity to catalyse its regioselective glucosylation. AmSP-Q353F and AmSP-P140D were shown to catalyse the regiospecific glucosylation of (+)-catechin using sucrose as donor substrate. While AmSP-WT was devoid of synthetic activity, each of its two single mutant provided high yields of specific regioisomers: 89% of (+)-catechin-4'-O-α-D-glucopyranoside (CAT-4’) for AmSP-P140D and 92% of (+)-catechin-3'-O-α-D-glucopyranoside (CAT-3’) for AmSP-Q353F. The novel compound CAT-4’ was fully characterized by NMR and mass spectrometry. We used molecular docking simulations on structural models of the glucosyl-enzyme intermediate to explain this regioselectivity. We showed that AmSP-P140D preferentially binds (+)-catechin in a mode that favours glucosylation on its hydroxyl group in position 4’ (OH-4’) while the binding mode of the flavonoid in AmSP-Q353F favoured glucosylation on its hydroxyl group in position 3’ (OH-3’).Competing Interest StatementThe authors have declared no competing interest.},

keywords = {},

pubstate = {forthcoming},

tppubtype = {article}

}

@article{demonceaux2023regioselective,

title = {Regioselective glucosylation of (+)-catechin using a new variant of sucrose phosphorylase from Bifidobacterium adolescentis},

author = {Marie Demonceaux and Marine Goux and Johann Hendrickx and Claude Solleux and Frédéric Cadet and Émilie Lormeau and Bernard Offmann and Corinne André-Miral},

doi = {10.1039/D3OB00191A},

year  = {2023},

date = {2023-02-22},

urldate = {2023-02-22},

journal = {Organic & Biomolecular Chemistry},

volume = {21},

number = {11},

pages = {2307--2311},

publisher = {Royal Society of Chemistry},

abstract = {Mutation Q345F in sucrose phosphorylase from Bifidobacterium adolescentis (BaSP) has shown to allow efficient (+)-catechin glucosylation yielding a regioisomeric mixture: (+)-catechin-3′-O-α-D-glucopyranoside, (+)-catechin-5-O-α-D-glucopyranoside and (+)-catechin-3′,5-O-α-D-diglucopyranoside with a ratio of 51 : 25 : 24. Here, we efficiently increased the control of (+)-catechin glucosylation regioselectivity with a new variant Q345F/P134D. The same products were obtained with a ratio of 82 : 9 : 9. Thanks to bioinformatics models, we successfully explained the glucosylation favoured at the OH-3′ position due to the mutation P134D.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Teze2020,

title = {A Single Point Mutation Converts GH84 O-GlcNAc Hydrolases into Phosphorylases: Experimental and Theoretical Evidence},

author = {David Teze and Joan Coines and Lluís Raich and Valentina Kalichuk and Claude Solleux and Charles Tellier and Corinne André-Miral and Birte Svensson and Carme Rovira},

doi = {10.1021/jacs.9b09655},

issn = {15205126},

year  = {2020},

date = {2020-01-01},

journal = {Journal of the American Chemical Society},

volume = {142},

number = {5},

pages = {2120--2124},

abstract = {Glycoside hydrolases and phosphorylases are two major classes of enzymes responsible for the cleavage of glycosidic bonds. Here we show that two GH84 O-GlcNAcase enzymes can be converted to efficient phosphorylases by a single point mutation. Noteworthy, the mutated enzymes are over 10-fold more active than naturally occurring glucosaminide phosphorylases. We rationalize this novel transformation using molecular dynamics and QM/MM metadynamics methods, showing that the mutation changes the electrostatic potential at the active site and reduces the energy barrier for phosphorolysis by 10 kcaltextperiodcenteredmol-1. In addition, the simulations unambiguously reveal the nature of the intermediate as a glucose oxazolinium ion, clarifying the debate on the nature of such a reaction intermediate in glycoside hydrolases operating via substrate-assisted catalysis.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Andre-Miral2015,

title = {De novo design of a trans-β-N-acetylglucosaminidase activity from a GH1 β-glycosidase by mechanism engineering},

author = {Corinne André-Miral and Fankroma Mt Koné and Claude Solleux and Cyrille Grandjean and Michel Dion and Vinh Tran and Charles Tellier},

doi = {10.1093/glycob/cwu121},

issn = {14602423},

year  = {2015},

date = {2015-01-01},

journal = {Glycobiology},

volume = {25},

number = {4},

pages = {394--402},

abstract = {Glycoside hydrolases are particularly abundant in all areas of metabolism as they are involved in the degradation of natural polysaccharides and glycoconjugates. These enzymes are classified into 133 families (CAZy server, http://www.cazy.org) in which members of each family have a similar structure and catalytic mechanism. In order to understand better the structure/function relationships of these enzymes and their evolution and to develop new robust evolved glycosidases, we undertook to convert a Family 1 thermostable β-glycosidase into an exo-β-N-acetylglucosaminidase. This latter activity is totally absent in Family 1, while natural β-hexosaminidases belong to CAZy Families 3, 20 and 84. Using molecular modeling, we first showed that the docking of N-acetyl-d-glucosamine in the subsite -1 of the β-glycosidase from Thermus thermophilus (TtβGly) suggested several steric conflicts with active site amino-acids (N163, E338) induced by the N-acetyl group. Both N163A and N163D-E338G mutations induced significant N-acetylglucosaminidase activity in TtβGly. The double mutant N163D-E338G was also active on the bicyclic oxazoline substrate, suggesting that this mutated enzyme uses a catalytic mechanism involving a substrate-assisted catalysis with a noncovalent oxazoline intermediate, similar to the N-acetylglucosaminidases from Families 20 and 84. Furthermore, a very efficient trans-N-acetylglucosaminidase activity was observed when the double mutant was incubated in the presence of NAG-oxazoline as a donor and N-methyl-O-benzyl-N-(β-d-glucopyranosyl)-hydroxylamine as an acceptor. More generally, this work demonstrates that it is possible to exchange the specificities and catalytic mechanisms with minimal changes between phylogenetically distant protein structures.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}