5va9

Human pancreatic alpha amylase in complex with peptide inhibitor piHA-L5(d10Y)Human pancreatic alpha amylase in complex with peptide inhibitor piHA-L5(d10Y)

Structural highlights 5va9 is a 4 chain structure with sequence from Homo sapiens and Synthetic construct. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.55Å Ligands: , , , , Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function AMYP_HUMAN Publication Abstract from PubMed De novo macrocyclic peptides, derived using selection technologies such as phage and mRNA display, present unique and unexpected solutions to challenging biological problems. This is due in part to their unusual folds, which are able to present side chains in ways not available to canonical structures such as alpha-helices and beta-sheets. Despite much recent interest in these molecules, their folding and binding behavior remains poorly characterized. In this work, we present cocrystallization, docking, and solution NMR structures of three de novo macrocyclic peptides that all bind as competitive inhibitors with single-digit nanomolar Ki to the active site of human pancreatic alpha-amylase. We show that a short stably folded motif in one of these is nucleated by internal hydrophobic interactions in an otherwise dynamic conformation in solution. Comparison of the solution structures with a target-bound structure from docking indicates that stabilization of the bound conformation is provided through interactions with the target protein after binding. These three structures also reveal a surprising functional convergence to present a motif of a single arginine sandwiched between two aromatic residues in the interactions of the peptide with the key catalytic residues of the enzyme, despite little to no other structural homology. Our results suggest that intramolecular hydrophobic interactions are important for priming binding of small macrocyclic peptides to their target and that high rigidity is not necessary for high affinity. Folding Then Binding vs Folding Through Binding in Macrocyclic Peptide Inhibitors of Human Pancreatic alpha-Amylase.,Goldbach L, Vermeulen BJA, Caner S, Liu M, Tysoe C, van Gijzel L, Yoshisada R, Trellet M, van Ingen H, Brayer GD, Bonvin AMJJ, Jongkees SAK ACS Chem Biol. 2019 Aug 16;14(8):1751-1759. doi: 10.1021/acschembio.9b00290. Epub, 2019 Jul 19. PMID:31241898 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Amylase 3D structures

spinqualitylabelsall models 5va9, resolution 2.55Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image