• Poster No.: 2S-Ba04
  • Presentation Time: September 10, 2014　10:30-
  • Title: Production and functional characterization of glycosides and oligosaccharide
  • Author(s): ○Doman Kim1,2, Thi Thanh Hanh Nguyen1, Ye-Sul Seo1, Sun Lee1, Jae-Young Cho1
    (1Inst. Green Bio Sci. & Technol. Seoul Natl. Univ., 2Dept. Agric. Biotechnol., Seoul Natl. Univ.)

Abstract

In this presentation we will briefly introduce about current research progress related with glycoside synthesis using glycansucrases and carbohydrase inhibitor screening using Grid. We are synthesizing various glycosides of the hydroquinone and flavonoids for the improvement of antioxidant activity. Hydroquinone (HQ) functions as a skin whitening agent, but it has the potential to cause dermatitis. We synthesized a novel HQ fructoside (HF), HQ galactoside and HQ glucoside as potential skin whitening agents by reacting glycansucrases from Leuconostoc mesenteroides with HQ as an acceptor and sucrose as a donor. HF synthesis was determined using a response surface methodology and HF showed anti-oxidation activities and inhibition against tyrosinase. The IC 50 of DPPH scavenging activity was 5.83-mM, showing higher anti-oxidant activity compared to β-arbutin (IC 50 = 6.04-mM). The Ki value of HF (0.67-mM) against tyrosinase was smaller than that of β-arbutin (Ki = 2.8-mM). Virtual screening (VS) was applied for discovery of new inhibitors for the human intestinal maltase (HMA) enzyme as well as SARS, Dengue fever, H5N1 and malaria target proteins. VS of 308 307 compounds was performed with HMA using 4700 CPUs and AutoDock 3.0.5 in a WISDOM (Wide In Silico Docking On Malaria) production environment. The 42 best ranked compounds containing hydrogen bond interaction with key residues from VS were tested in vitro for their inhibitory activities against the recombinant HMA from Pichia pastoris. Compounds 17 and 18 were identified as competitive inhibitors for enzyme inhibition. In contrast to acarbose, the two compounds showed no inhibition on human pancreatic α-amylase, suggesting potential inhibitors with fewer side effects, including abdominal discomforts.