Regioselective glucosylation of (+)-catechin using a new variant of sucrose phosphorylase from Bifidobacterium adolescentis .

Mutation Q345F in sucrose phosphorylase from Bifidobacterium adolescentis ( Ba SP) 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.