Abstract
An isolated gene from Bacillus subtilis str. 168 encoding a putative isomerase was proposed as an L-arabinose isomerase (L-AI), cloned into Escherichia coli, and its nucleotide sequence was determined. DNA sequence analysis revealed an open reading frame of 1,491 bp, capable of encoding a polypeptide of 496 amino acid residues. The gene was overexpressed in E. coli and the protein was purified using nickel-nitrilotriacetic acid chromatography. The purified enzyme showed the highest catalytic efficiency ever reported, with a k cat of 14,504 min−1 and a k cat/K m of 121 min−1 mM−1 for L-arabinose. A homology model of B. subtilis L-AI was constructed based on the X-ray crystal structure of E. coli L-AI. Molecular dynamics simulation studies of the enzyme with the natural substrate, L-arabinose, and an analogue, D-galactose, shed light on the unique substrate specificity displayed by B. subtilis L-AI only towards L-arabinose. Although L-AIs have been characterized from several other sources, B. subtilis L-AI is distinguished from other L-AIs by its high substrate specificity and catalytic efficiency for L-arabinose.
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Acknowledgment
This work was supported by the 21C Frontier Microbial Genomics and Applications Center Program, Ministry of Education, Science & Technology, Republic of Korea. It was also supported by a grant (code 2008A0080126) from Agricultural Research and Development Promotion Center and a grant (code 20070301034024) from the Biogreen 21 Program, Rural Development Administration, Republic of Korea.
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Kim, JH., Prabhu, P., Jeya, M. et al. Characterization of an L-arabinose isomerase from Bacillus subtilis . Appl Microbiol Biotechnol 85, 1839–1847 (2010). https://doi.org/10.1007/s00253-009-2210-6
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DOI: https://doi.org/10.1007/s00253-009-2210-6