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Publication Abstract from PubMed

Among the epimerases specific to alginate, some of them in Azotobacter genera convert beta-d-mannuronic acid to alpha-l-guluronic acid but also have lyase activity to degrade alginate. The remarkable characteristics of these epimerases make it a promising enzyme for tailoring alginates to meet specific demands. Here, we determined the structure of the bifunctional mannuronan C-5 epimerase AlgE3 from Azotobacter chroococcum (AcAlgE3) in complex with several mannuronic acid oligomers as well as in apo form, which allowed us to elucidate the binding manner of each mannuronic acid oligomer, and the structural plasticity, which is dependent on calcium ions. Moreover, a comprehensive analysis of the lyase activity profiles of AcAlgE3 combined with structural characteristics explained the preference for different chain length oligomers.

Structural basis for the minimal bifunctional alginate epimerase AlgE3 from Azotobacter chroococcum.,Fujiwara T, Mano E, Nango E FEBS Lett. 2024 Apr 22. doi: 10.1002/1873-3468.14886. PMID:38649293^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.