Abstract
L-ribulose, a kind of high-value rare sugar, could be utilized to manufacture L-form sugars and antiviral drugs, generally produced from L-arabinose as a substrate. However, the production of L-ribulose from L-arabinose is limited by the equilibrium ratio of the catalytic reaction, hence, it is necessary to explore a new biological enzymatic method to produce L-ribulose. Ribose-5-phosphate isomerase (Rpi) is an enzyme that can catalyze the reversible isomerization between L-ribose and L-ribulose, which is of great significance for the preparation of L-ribulose. In order to obtain highly active ribose-5-phosphate isomerase to manufacture L-ribulose, ribose-5-phosphate isomerase A (OsRpiA) from Ochrobactrum sp. CSL1 was engineered based on structural and sequence analyses. Through a rational design strategy, a triple-mutant strain A10T/T32S/G101N with 160% activity was acquired. The enzymatic properties of the mutant were systematically investigated, and the optimum conditions were characterized to achieve the maximum yield of L-ribulose. Kinetic analysis clarified that the A10T/T32S/G101N mutant had a stronger affinity for the substrate and increased catalytic efficiency. Furthermore, molecular dynamics simulations indicated that the binding of the substrate to A10T/T32S/G101N was more stable than that of wild type. The shorter distance between the catalytic residues of A10T/T32S/G101N and L-ribose illuminated the increased activity. Overall, the present study provided a solid basis for demonstrating the complex functions of crucial residues in RpiAs as well as in rare sugar preparation.
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This study was funded by the National Natural Science Foundation of China (Grant Nos. 21676173 and 32001634).
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Qian Zheng: Writing (original draft) and investigation. Rong Wang: Methodology and investigation. Xin Ju: Conceptualization, methodology, and writing—original draft. Xujing Gu: Investigation. Xinqi Xu: Investigation and writing—original draft. Zhi Chen: Investigation. Liangzhi Li: Project administration, supervision, and writing—review and editing.
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Zheng, Q., Wang, R., Ju, X. et al. Enhancement of L-ribulose Production from L-ribose Through Modification of Ochrobactrum sp. CSL1 Ribose-5-phosphate Isomerase A. Appl Biochem Biotechnol 194, 4852–4866 (2022). https://doi.org/10.1007/s12010-022-04015-2
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DOI: https://doi.org/10.1007/s12010-022-04015-2