화학공학소재연구정보센터
Biotechnology Letters, Vol.39, No.8, 1229-1235, 2017
Molecular cloning and expression of a glycosyltransferase from Bacillus subtilis for modification of morin and related polyphenols
Objectives To characterize glycosyltransferases from Bacillus subtilis ATCC 6633 and investigate their substrate specificity towards plant polyphenols. Results Among the cloned and expressed six UDP-glycosyltransferases (BsGT1-6), BsGT-1 showed activity with a wide range of polyphenols: morin, quercetin, alizarin, rehin, curcumin and aloe emodin. The gene of BsGT-1 has an ORF of 1206 bp encoding 402 amino acids. The recombinant enzyme was purified to homogeneity by Ni-NTA affinity chromatograph, and its biochemical characteristics were identified by HPLC-UV/MS, H-1-NMR and C-13-NMR. BsGT-1 has anMWof approx. 46 kDa as indicated by SDS-PAGE; its activity was optimal at 40 degrees C and pH 8.5. The Km value of BsGT-1 towards morin was 110 mu M. Conclusions BsGT-1 from B. subtilis was cloned. It had high catalytic capabilities towards polyphenols which would make it feasible for the structural modification of polyphenols.