9m2i

E. coli MaeB holo form ME domain dimer

spinqualitylabelsall models 9m2i, resolution 3.19Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 9m2i is a 2 chain structure with sequence from Escherichia coli K-12. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Electron Microscopy, Resolution 3.19Å Ligands: MG, NAP Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function MAO2_ECOLI Catalyzes the decarboxylation of malate to pyruvate (PubMed:17557829). In vitro, shows malolactic enzyme activity in the presence of NADPH. However, it is unlikely that this activity is of relevance in E.coli, which produces little NADPH (PubMed:33824210). Publication Abstract from PubMed Malic enzymes (MEs) function as the bypass enzyme in the Krebs cycle and have attracted attention in a wide range of scientific and industrial fields. In contrast to eukaryotic MEs, there is currently a lack of understanding of the structure-function relationships of prokaryotic MEs. Especially, little is known about an allosteric inhibition mechanism by an effector ligand in multi-domain MEs called hybrid-type MEs. Many bacterial hybrid-type MEs are inhibited by acetyl-CoA; however, the proposed acetyl-CoA binding site is not conserved. Here, we determined crystal and cryo-EM structures of hybrid-type MEs from Escherichia coli (EcMaeB) and Bdellovibrio bacteriovorus including complexes with acetyl-CoA. They reveal that these MaeBs have totally different acetyl-CoA binding sites and show different overall structural changes. However, the binding acetyl-CoA molecules induce identical movements of several alpha helices near the ligand both in EcMaeB and BbMaeB. Enzymatic assays proved that residues at the acetyl-CoA binding site are needed for inhibition. Phylogenetic analysis uncovered that EcMaeB and BbMaeB are classified into different clades of hybrid-type MEs and that the amino acid residues at the acetyl-CoA binding sites in different clades have evolved exclusively from each other. These results not only provide insights into bacterial MEs but also expand our knowledge about allosteric regulation in enzymes. Divergent acetyl-CoA binding modes mediate allosteric inhibition of bacterial hybrid-type malic enzymes.,Sassa M, Yamato H, Tanino H, Fukuda Y, Inoue T J Biol Chem. 2025 Nov 4;301(12):110887. doi: 10.1016/j.jbc.2025.110887. PMID:41197718 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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