3nq9
Bovine beta-lactoglobulin complex with caprylic acid
Structural highlights
FunctionLACB_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 PubMedLactoglobulin is a natural protein present in bovine milk and common component of human diet, known for binding with high affinity wide range of hydrophobic compounds, among them fatty acids 12-20 carbon atoms long. Shorter fatty acids were reported as not binding to beta-lactoglobulin. We used X-ray crystallography and fluorescence spectroscopy to show that lactoglobulin binds also 8- and 10-carbon caprylic and capric acids, however with lower affinity. The determined apparent association constant for lactoglobulin complex with caprylic acid is 10.8 +/- 1.7 x 10(3) M(-1) , while for capric acid is 6.0 +/- 0.5 x 10(3) M(-1) . In crystal structures determined with resolution 1.9 A the caprylic acid is bound in upper part of central calyx near polar residues located at CD loop, while the capric acid is buried deeper in the calyx bottom and does not interact with polar residues at CD loop. In both structures, water molecule hydrogen-bonded to carboxyl group of fatty acid is observed. Different location of ligands in the binding site indicates that competition between polar and hydrophobic interactions is an important factor determining position of the ligand in beta-barrel. Copyright (c) 2010 John Wiley & Sons, Ltd. Two modes of fatty acid binding to bovine beta-lactoglobulin-crystallographic and spectroscopic studies.,Loch J, Polit A, Gorecki A, Bonarek P, Kurpiewska K, Dziedzicka-Wasylewska M, Lewinski K J Mol Recognit. 2011 Mar;24(2):341-9. doi: 10.1002/jmr.1084. Epub 2010 Dec, 14. PMID:21360616[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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