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Song H, Zhao G, Zhang M, Bi R, Meng X, Song J, Wang B, Liu J, Liu L, Lyu Y, Zhang X. Optimization of the UDP-Xyl biocatalytic synthesis from Crassostrea gigas by orthogonal design method. Protein Expr Purif 2021; 190:106002. [PMID: 34666163 DOI: 10.1016/j.pep.2021.106002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2021] [Revised: 08/25/2021] [Accepted: 10/14/2021] [Indexed: 10/20/2022]
Abstract
UDP-Xyl, a nucleotide sugar involved in the biosynthesis of various glycoconjugates, is difficult to obtain and quite expensive. Biocatalysis using a one-pot multi-enzyme cascade is one of the most valuable biotransformation processes widely used in the industry. Herein, two enzymes, UDP-glucose (UDP-Glc) dehydrogenase (CGIUGD) and UDP-Xyl synthase (CGIUXS) from the Pacific oyster Crassostrea gigas, which are coupled together for the biotransformation of UDP-Xyl, were characterized. The optimum pH was determined to be pH 9.0 for CGIUGD and pH 7.5 for CGIUXS. Both enzymes showed the highest activity at 37 °C. Neither enzyme is metal ion-dependent. On this basis, a single factor and orthogonal test were applied to optimize the condition of biotransformation of UDP-Xyl from UDP-Glc. Orthogonal design L9 (33) was conducted to optimize processing variables of enzyme amount, pH, and temperature. The conversion of UDP-Xyl was selected as an analysis indicator. Optimum variables were the ratio of CGIUGD to CGIUXS of 2:5, enzymatic pH of 8.0, and temperature of 37 °C, which is confirmed by three repeated validation experiments. The UDP-Xyl conversion was 69.921% in a 1 mL reaction mixture by optimized condition for 1 h. This is the first report for the biosynthesis of UDP-Xyl from oyster enzymes.
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Affiliation(s)
- Huibo Song
- College of Agricultural and Biological Engineering (College of Tree Peony), Heze University, Heze, China
| | - Guihong Zhao
- College of Agricultural and Biological Engineering (College of Tree Peony), Heze University, Heze, China
| | - Ming Zhang
- College of Agricultural and Biological Engineering (College of Tree Peony), Heze University, Heze, China
| | - Ruiming Bi
- College of Agricultural and Biological Engineering (College of Tree Peony), Heze University, Heze, China
| | - Xinhui Meng
- College of Agricultural and Biological Engineering (College of Tree Peony), Heze University, Heze, China
| | - Junliu Song
- College of Agricultural and Biological Engineering (College of Tree Peony), Heze University, Heze, China
| | - Bo Wang
- College of Agricultural and Biological Engineering (College of Tree Peony), Heze University, Heze, China
| | - Jian Liu
- College of Agricultural and Biological Engineering (College of Tree Peony), Heze University, Heze, China
| | - Li Liu
- Glycomics and Glycan Bioengineering Research Center (GGBRC), College of Food Science and Technology, Nanjing Agricultural University, Nanjing, 210095, China
| | - Yongmei Lyu
- School of Marine and Bioengineering, Yancheng Institute of Technology, NO 1, Xiwang Road, Yancheng, 224051, China.
| | - Xiaoyang Zhang
- School of Marine and Bioengineering, Yancheng Institute of Technology, NO 1, Xiwang Road, Yancheng, 224051, China.
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The evolutionary life cycle of the polysaccharide biosynthetic gene cluster based on the Sphingomonadaceae. Sci Rep 2017; 7:46484. [PMID: 28429731 PMCID: PMC5399355 DOI: 10.1038/srep46484] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2016] [Accepted: 03/21/2017] [Indexed: 11/08/2022] Open
Abstract
Although clustering of genes from the same metabolic pathway is a widespread phenomenon, the evolution of the polysaccharide biosynthetic gene cluster remains poorly understood. To determine the evolution of this pathway, we identified a scattered production pathway of the polysaccharide sanxan by Sphingomonas sanxanigenens NX02, and compared the distribution of genes between sphingan-producing and other Sphingomonadaceae strains. This allowed us to determine how the scattered sanxan pathway developed, and how the polysaccharide gene cluster evolved. Our findings suggested that the evolution of microbial polysaccharide biosynthesis gene clusters is a lengthy cyclic process comprising cluster 1 → scatter → cluster 2. The sanxan biosynthetic pathway proved the existence of a dispersive process. We also report the complete genome sequence of NX02, in which we identified many unstable genetic elements and powerful secretion systems. Furthermore, nine enzymes for the formation of activated precursors, four glycosyltransferases, four acyltransferases, and four polymerization and export proteins were identified. These genes were scattered in the NX02 genome, and the positive regulator SpnA of sphingans synthesis could not regulate sanxan production. Finally, we concluded that the evolution of the sanxan pathway was independent. NX02 evolved naturally as a polysaccharide producing strain over a long-time evolution involving gene acquisitions and adaptive mutations.
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Wu M, Li G, Huang H, Chen S, Luo Y, Zhang W, Li K, Zhou J, Ma T. The simultaneous production of sphingan Ss and poly(R-3-hydroxybutyrate) in Sphingomonas sanxanigenens NX02. Int J Biol Macromol 2016; 82:361-8. [DOI: 10.1016/j.ijbiomac.2015.09.071] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2015] [Revised: 09/28/2015] [Accepted: 09/29/2015] [Indexed: 11/26/2022]
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