Abstract
The α-L-arabinofuranosidase enzyme plays a crucial role in the degradation of ginsenosides. In this study, we successfully cloned and expressed a novel α-L-arabinofuranosidase bsafs gene (1503 bp, 501 amino acids, 55 kDa, and pI = 5.4) belonging to glycosyl hydrolase (GH) family 51 from Bacillus subtilis genome in Escherichia coli BL21 cells. The recombinant protein Bsafs was purified using Ni2+ sepharose fastflow affinity chromatography and exhibited a specific activity of 2.91 U/mg. Bsafs effectively hydrolyzed the α-L-arabinofuranoside at C20 site of ginsenoside Rc to produce Rd as the product. The Km values for hydrolysis of pNP-α-L-arabinofuranoside (pNPαAraf) and ginsenoside Rc were determined as 0.74 and 4.59 mmol/L, respectively; while the Vmax values for these substrates were found to be 24 and 164 μmol/min/mg, respectively; furthermore, the Kcat values for these enzymes were calculated as 22.3 and 1.58 S−1 correspondingly.
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Funding
This work is supported by Special Basic Cooperative Research Programs of Yunnan Provincial Undergraduate Universities’ Association (Grant NO. 202301BA070001-081), Yunnan Fundamental Research Projects (Grant NO. 202301AU070012), Special Basic Cooperative Research Innovation Programs of Qujing Science and Technology Bureau & Qujing Normal University (Grant NO. KJLH2023ZD06, KJLH2022YB07).
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L. Z and Y. C. W conceived the study and supervised the project. J C cloned and expressed Bsafs. L. Z tudy of the enzymatic activity of Bsafs. L. Z wrote the main manuscript. All authors participated in preparation of the manuscript.
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Communicated by PANKAJ BHATT.
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Zhu, L., Wang, Y. & Cai, J. Molecular cloning, expression, purification, and characterization of Bacillus subtilis hydrolyzed ginsenoside Rc of α-L-arabinofuranosidase in Escherichia coli. Arch Microbiol 206, 181 (2024). https://doi.org/10.1007/s00203-024-03902-y
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DOI: https://doi.org/10.1007/s00203-024-03902-y