1g74

Toward changing specificity: adipocyte lipid binding protein mutant, oleic acid bound form

spinqualitylabelsall models 1g74, resolution 1.70Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1g74 is a 1 chain structure with sequence from Mus musculus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.7Å Ligands: OLA, PO4 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function FABP4_MOUSE Lipid transport protein in adipocytes. Binds both long chain fatty acids and retinoic acid. Delivers long-chain fatty acids and retinoic acid to their cognate receptors in the nucleus. 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 The family of proteins accountable for the intracellular movement of lipids is characterized by a 10-stranded beta-barrel that forms an internalized cavity varying in size and binding preferences. The loop connecting beta-strands E and F (the fifth and sixth strands) is the most striking conformational difference between adipocyte lipid binding protein (ALBP; fatty acids) and cellular retinoic acid binding protein type I (CRABP I). A three-residue mutation was made in wild-type (WT)-ALBP [ALBP with a three-residue mutation (EF-ALBP)] to mimic CRABP I. Crystal structures of ligand-free and EF-ALBP with bound oleic acid were solved to resolutions of 1.5 A and 1.7 A, respectively, and compared with previous studies of WT-ALBP. The changes in three residues of one loop of the protein appear to have altered the positioning of the C18 fatty acid, as observed in the electron density of EF-ALBP. The crystallographic studies made it possible to compare the protein conformation and ligand positioning with those found in the WT protein. Although the cavity binding sites in both the retinoid and fatty acid binding proteins are irregular, the ligand atoms appear to favor a relatively planar region of the cavities. Preliminary chemical characterization of the mutant protein indicated changes in some binding properties and overall protein stability. Specificity determinants for lipids bound to beta-barrel proteins.,Reese AJ, Banaszak LJ J Lipid Res. 2004 Feb;45(2):232-43. Epub 2003 Nov 1. PMID:14594993 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Fatty acid-binding protein 3D structures

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