Characterization ofl-fucose isomerase fromPaenibacillus rhizosphaeraeto producel-fuculose from hydrolyzed fucoidan and commercial fucose

Author:

Iqbal Muhammad Waheed12,Riaz Tahreem12,Mu Wanmeng1,Mahmood Shahid12,Qi Xianghui2,Ni Dawei1,Zhang Wenli1

Affiliation:

1. State Key Laboratory of Food Science and Technology, Jiangnan University , Wuxi, Jiangsu 214122 , China

2. School of Food and Biological Engineering, Jiangsu University , Zhenjiang, Jiangsu 212013 , China

Abstract

AbstractAimsl-Fuculose is a valuable rare sugar that is used to treat a variety of ailments, including HIV, cancer, Hepatitis B, human lysosomal disease (fucosidosis), and cardio-protective medications. The enzymatic approach for the production of l-fuculose using l-fucose as a substrate would be an advantageous method with a wide range of industrial applications. The objective of this study is the characterization of recombinant l-fucose isomerase from Paenibacillus rhizosphaerae (Pa-LFI) for the production of l-fuculose from an inexpensive and natural source (fucoidan) as well as its comparison with commercial l-fucose (Sigma-Aldrich).Methods and resultsFucoidan, a fucose-containing polysaccharide (FPs), was isolated from Undaria pinnatifida, subsequently hydrolyzed, and characterized before the enzymatic production of l-fuculose. The results elaborate that FPs contain 35.9% of fucose along with other kinds of monosaccharides. The purified Pa-LFI exhibited a single band at 65 kDa and showed it as a hexamer with a native molecular mass of 396 kDa. The highest activity of 104.5 U mg−1 of Pa-LFI was perceived at a temperature of 50°C and pH 6.5 in the presence of 1 mM of Mn2+. The Pa-LFI revealed a melting temperature (Tm) of 75°C and a half-life of 12.6 h at 50°C. It exhibited that Pa-LFI with aldose substrate (l-fucose), has a stronger isomerizing activity, disclosing Km,kcat, and kcat/Km 86.2 mM, 32 831 min−1, and 335 min−1 mM−1, respectively. After reaching equilibrium, Pa-LFI efficiently catalyzed the reaction to convert l-fucose into l-fuculose and the conversion ratios of l-fuculose from 100 g L−1 of FPs and commercial fucose were around 6% (5.6 g L−1) and 30% (30.2 g L−1), respectively.ConclusionsAccording to the findings of the current study, the Pa-LFI will be useful in the manufacturing of l-fuculose using an effective and easy approach that produces no by-products.

Funder

National Natural Science Foundation of China

Natural Science Foundation of Jiangsu Province

Publisher

Oxford University Press (OUP)

Subject

Applied Microbiology and Biotechnology,General Medicine,Biotechnology

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