3t2c

Fructose-1,6-bisphosphate aldolase/phosphatase from Thermoproteus neutrophilus, DHAP-bound formFructose-1,6-bisphosphate aldolase/phosphatase from Thermoproteus neutrophilus, DHAP-bound form

Structural highlights 3t2c is a 1 chain structure with sequence from Thermoproteus neutrophilus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: , Related: 3t2b, 3t2d, 3t2e, 3t2f, 3t2g Gene: Tneu_0133 (Thermoproteus neutrophilus) Resources: FirstGlance, OCA, RCSB, PDBsum Publication Abstract from PubMed Fructose-1,6-bisphosphate (FBP) aldolase/phosphatase is a bifunctional, thermostable enzyme that catalyses two subsequent steps in gluconeogenesis in most archaea and in deeply branching bacterial lineages. It mediates the aldol condensation of heat-labile dihydroxyacetone phosphate (DHAP) and glyceraldehyde-3-phosphate (GAP) to FBP, as well as the subsequent, irreversible hydrolysis of the product to yield the stable fructose-6-phosphate (F6P) and inorganic phosphate; no reaction intermediates are released. Here we present a series of structural snapshots of the reaction that reveal a substantial remodelling of the active site through the movement of loop regions that create different catalytic functionalities at the same location. We have solved the three-dimensional structures of FBP aldolase/phosphatase from thermophilic Thermoproteus neutrophilus in a ligand-free state as well as in complex with the substrates DHAP and FBP and the product F6P to resolutions up to 1.3 A. In conjunction with mutagenesis data, this pinpoints the residues required for the two reaction steps and shows that the sequential binding of additional Mg(2+) cations reversibly facilitates the reaction. FBP aldolase/phosphatase is an ancestral gluconeogenic enzyme optimized for high ambient temperatures, and our work resolves how consecutive structural rearrangements reorganize the catalytic centre of the protein to carry out two canonical reactions in a very non-canonical type of bifunctionality. Active-site remodelling in the bifunctional fructose-1,6-bisphosphate aldolase/phosphatase.,Du J, Say RF, Lu W, Fuchs G, Einsle O Nature. 2011 Oct 9. doi: 10.1038/nature10458. PMID:21983965 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Aldolase Suggestions for new articles

spinqualitylabelsall models 3t2c, resolution 1.30Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image