2jn3 | pdb_00002jn3

NMR structure of cl-BABP complexed to chenodeoxycholic acid

spinqualitylabelsall models 2jn3, 20 NMR models Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2jn3 is a 1 chain structure with sequence from Gallus gallus. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: JN3 Gene: FABP1 (Gallus gallus) Resources: FirstGlance, OCA, RCSB, PDBsum Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed Bile acids are physiological detergents facilitating absorption, transport, and distribution of lipid-soluble vitamins and dietary fats;they also play a role as signaling molecules that activate nuclear receptors and regulate cholesterol metabolism. Bile acid circulation is mediated by bile acid binding proteins (BABPs), and a detailed structural study of the complex of BABPs with bile salts has become a key issue for the complete understanding of the role of these proteins and their involvement in cholesterol homeostasis. The solution structure here reported describes, at variance with previously determined singly ligated structures, a BABP in a ternary complex with two bile acid molecules, obtained by employing a variety of NMR experiments. Exchange processes between the two bound chenodeoxycholate molecules as well as the more superficial ligand and the free pool have been detected through ROESY and diffusion experiments. Significant backbone flexibility has been observed in regions located at the protein open end, facilitating bile salts exchange. A detailed description of the protonation states and tautomeric forms of histidines strongly supports the view that histidine protonation modulates backbone flexibility and regulates ligand binding. This structure opens the way to targeted site-directed mutagenesis and interaction studies to investigate both binding and nuclear localization mechanisms. Structural and dynamic determinants of ligand binding in the ternary complex of chicken liver bile acid binding protein with two bile salts revealed by NMR.,Eliseo T, Ragona L, Catalano M, Assfalg M, Paci M, Zetta L, Molinari H, Cicero DO Biochemistry. 2007 Nov 6;46(44):12557-67. Epub 2007 Oct 11. PMID:17929837 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Fatty acid-binding protein

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