1gxa

BOVINE BETA-LACTOGLOBULIN COMPLEXED WITH RETINOL AND PALMITIC ACID, TRIGONAL LATTICE Z

spinqualitylabelsall models 1gxa, resolution 2.35Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1gxa is a 1 chain structure with sequence from Bos taurus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.35Å Ligands: PLM Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function LACB_BOVIN Primary component of whey, it binds retinol and is probably involved in the transport of that molecule. 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 Ever since the fortuitous observation that beta-lactoglobulin (beta-Lg), the major whey protein in the milk of ruminants, bound retinol, the details of the binding have been controversial. beta-Lg is a lipocalin, like plasma retinol-binding protein, so that ligand association was expected to make use of the central cavity in the protein. However, an early crystallographic analysis and some of the more recent solution studies indicated binding elsewhere. We have now determined the crystal structures of the complexes of the trigonal form of beta-Lg at pH 7.5 with bound retinol (R=21.4% for 7329 reflections between 20 and 2.4 A resolution, R(free)=30.6%) and with bound retinoic acid (R=22.7% for 7813 reflections between 20 and 2.34 A resolution, R(free)=29.8%). Both ligands are found to occupy the central calyx in a manner similar to retinol binding in retinol-binding protein. We find no evidence of binding at the putative external binding site in either of these structural analyses. Further, competition between palmitic acid and retinol reveals only palmitate bound to the protein. An explanation is provided for the lack of ligand binding to the orthorhombic crystal form also obtained at pH 7.5. Finally, the possible function of beta-Lg is discussed in the light of its species distribution and similarity to other lipocalins. The ligand-binding site of bovine beta-lactoglobulin: evidence for a function?,Kontopidis G, Holt C, Sawyer L J Mol Biol. 2002 May 10;318(4):1043-55. PMID:12054801 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Beta-lactoglobulin 3D structures

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