5bk1

Crystal structure of maltose binding protein in complex with an endosteric synthetic antibody

spinqualitylabelsall models 5bk1, resolution 2.15Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5bk1 is a 6 chain structure with sequence from Escherichia coli and Homo sapiens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.15Å Ligands: CL, GOL Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function MALE_ECOLI Involved in the high-affinity maltose membrane transport system MalEFGK. Initial receptor for the active transport of and chemotaxis toward maltooligosaccharides. Publication Abstract from PubMed Conformational changes in proteins due to ligand binding are ubiquitous in biological systems and are integral to many biological systems. However, it is often challenging to link ligand-induced conformational changes to a resulting biological function because it is difficult to distinguish between the energetic components associated with ligand-binding and those due to structural rearrangements. Here, we used a unique approach exploiting conformation-specific and regio-specific synthetic antibodies (sABs) to probe the energetic contributions of ligand-binding to conformation changes. Using maltose binding protein (MBP) as a model system, customized phage display selections were performed to generate sABs that stabilize MBP in different conformational states, modulating ligand binding affinity in competitive, allosteric or peristeric manners. We determined that the binding of a closed conformation-specific sAB (sAB-11M) to MBP in the absence of maltose is entropically driven, providing new insight into designing antibody stabilized protein interactions. Crystal structures of sABs bound to MBP, together with biophysical data delineate the basis of free energy differences between different conformational states and confirm the use of the sABs as energy probes for dissecting enthalpic and entropic contributions to conformational transitions. Our work provides a foundation for investigating the energetic contributions of distinct conformational dynamics to specific biological outputs. We anticipate that our approach also may be valuable for analyzing the energy landscapes of regulatory proteins controlling biological responses to environmental changes. Engineered synthetic antibodies as probes to quantify the energetic contributions of ligand binding to conformational changes in proteins.,Mukherjee S, Griffin DH, Horn JR, Rizk SS, Nocula-Lugowska M, Malmqvist M, Kim SS, Kossiakoff AA J Biol Chem. 2018 Jan 10. pii: RA117.000656. doi: 10.1074/jbc.RA117.000656. PMID:29321208 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Antibody 3D structures Maltose-binding protein 3D structures 3D structures of human antibody

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