CN: 32-1845/R
ISSN: 2095-6975
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XU Jia-Qi, FAN Ni, YU Bo-Yang, WANG Qian-Qian, ZHANG Jian. Biotransformation of quercetin by Gliocladium deliquescens NRRL 1086[J]. Chinese Journal of Natural Medicines, 2017, 15(8): 615-624

Biotransformation of quercetin by Gliocladium deliquescens NRRL 1086

XU Jia-Qi1, FAN Ni2, YU Bo-Yang1, WANG Qian-Qian2, ZHANG Jian2
1. Jiangsu Provincial Key Laboratory for TCM Evaluation and Translational Research, China Pharmaceutical University, Nanjing 210009, China;
2. Institute of Biotechnology for TCM Research, School of Traditional Chinese Medicine, China Pharmaceutical University, Nanjing 211198, China
Abstract:
With an attempt to synthesize high-value isoquercitrin (quercetin-3-O-β-D-glucopyranoside), we carried out the biotransformation of quercetin (1) by Gliocladium deliquescens NRRL 1086. Along with the aimed product quercetin 3-O-β-D-glycoside (2), three additional metabolites, 2-protocatechuoyl-phlorogucinol carboxylic acid (3), 2,4,6-trihydroxybenzoic acid (4), and protocatechuic acid (5), were also isolated. The time-course experiments revealed that there were two metabolic routes, regio-selectivity glycosylation and quercetin 2,3-dioxygenation, co-existing in the culture. Both glycosylation and oxidative cleavage rapidly took place after quercetin feeding; about 98% quercetin were consumed within the initial 8 h and the oxdized product (2-protocatechuoyl-phlorogucinol carboxylic acid) was hydrolyzed into two phenolic compounds (2,4,6-trihydroxybenzoic acid and protocatechuic acid). We also investigated the impact of glucose content and metal ions on the two reactions and found that high concentrations of glucose significantly inhibited the oxidative cleavage and improved the yield of isoquercitrin and that Ca2+, Fe2+, Mn2+, Mg2+, and Zn2+ inhibited glycosylation. To test the promiscuity of this culture, we selected other four flavonols as substrates; the results demonstrated its high regio-selectivity glycosylation ability towards flavonols at C-3 hydroxyl. In conclusion, our findings indicated that the versatile microbe of G. deliquescens NRRL 1086 maitained abundant enzymes, deserving further research.
Key words:    Gliocladium deliquescens NRRL 1086    Quercetin    Biotransformation    Glycosylation    Quercetin-2,3-dioxygenase    
Received: 2016-10-11   Revised:
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