5zfs
From Proteopedia
Crystal structure of Arthrobacter globiformis M30 sugar epimerase which can produce D-allulose from D-fructose
Structural highlights
FunctionKET3E_ARTGO Catalyzes the reversible C-3 epimerization of several ketoses. Shows the highest enzymatic activity for the epimerization of L-ribulose to L-xylulose. Is also able to convert D-allulose (also known as D-psicose) to D-fructose and, to a lesser extent, L-tagatose to L-sorbose, D-ribulose to D-xylulose, L-allulose to L-fructose and D-tagatose to D-sorbose.[1] [2] Publication Abstract from PubMedThe X-ray structure of ketose 3-epimerase from Arthrobacter globiformis M30, which was previously reported to be a D-allulose 3-epimerase (AgD-AE), was determined at 1.96 A resolution. The crystal belonged to the hexagonal space group P6522, with unit-cell parameters a = b = 103.98, c = 256.53 A. The structure was solved by molecular replacement using the structure of Mesorhizobium loti L-ribulose 3-epimerase (MlL-RE), which has 41% sequence identity, as a search model. A hexagonal crystal contained two molecules in the asymmetric unit, and AgD-AE formed a homotetramer with twofold symmetry. The overall structure of AgD-AE was more similar to that of MlL-RE than to the known structures of D-psicose (alternative name D-allulose) 3-epimerases (D-PEs or D-AEs), although AgD-AE and MlL-RE have different substrate specificities. Both AgD-AE and MlL-RE have long helices in the C-terminal region that would contribute to the stability of the homotetramer. AgD-AE showed higher enzymatic activity for L-ribulose than D-allulose; however, AgD-AE is stable and is a unique useful enzyme for the production of D-allulose from D-fructose. X-ray structure of Arthrobacter globiformis M30 ketose 3-epimerase for the production of D-allulose from D-fructose.,Yoshida H, Yoshihara A, Gullapalli PK, Ohtani K, Akimitsu K, Izumori K, Kamitori S Acta Crystallogr F Struct Biol Commun. 2018 Oct 1;74(Pt 10):669-676. doi:, 10.1107/S2053230X18011706. Epub 2018 Sep 21. PMID:30279320[3] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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