Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 69, Issue 1, Pages 223-231Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jafc.0c06609
Keywords
l-asparaginase; Bacillus licheniformis; stereoselectivity; enzyme structures
Funding
- National Natural Science Foundation of China [31871742]
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The study identified two additional tyrosines in BlAsnase that are important for the binding and catalysis of D-asparagine. Substituting Tyr278 with methionine weakened the interaction with D-asparagine, leading to a loss of hydrolyzing function.
L-Asparaginase, which catalyzes the hydrolysis of L-asparagine, is an important enzyme in both the clinical and food industry. Exploration of efficient L-asparaginase with high substrate specificity, especially high chiral selectivity, is essential for extending its use. Herein, various crystal structures of type I L-asparaginase from Bacillus licheniformis (BlAsnase) have been resolved, and we found that there are two additional tyrosines in BlAsnase, contributing to the binding and catalysis of D-asparagine. Strikingly, the substitution of Tyr278 with methionine impaired the interaction with D-asparagine via water molecules due to the small hydrophobic side chain of methionine, which forced the ligand to the deep side of the active site toward the catalytic residues and thus resulted in the loss of hydrolyzing function. Our investigation of the substrate recognition mechanism of BlAsnase is significant for both a better understanding of L-asparaginase and its rational design to achieve high specificity for clinical and industrial applications.
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