2FT9

Crystal structure of axolotl (Ambystoma mexicanum) liver bile acid-binding protein bound to cholic acid

Summary for 2FT9

• Entry DOI: 10.2210/pdb2ft9/pdb
• Related: 2FTB
• Descriptor: Fatty acid-binding protein 2, liver, CHOLIC ACID (2 entities in total)
• Functional Keywords: liver bile acid-binding protein, liver basic fatty acid-binding protein, axolotl, cholic acid, lipid binding protein
• Biological source: Ambystoma mexicanum (axolotl)
• Cellular location: Cytoplasm: P81400
• Total number of polymer chains: 1
• Total formula weight: 14575.72

Authors

Capaldi, S.,Guariento, M.,Perduca, M.,Di Pietro, S.M.,Santome, J.A.,Monaco, H.L. (deposition date: 2006-01-24, release date: 2006-04-11, Last modification date: 2023-10-25)

Primary citation

Capaldi, S.,Guariento, M.,Perduca, M.,Di Pietro, S.M.,Santome, J.A.,Monaco, H.L.
Crystal structure of axolotl (Ambystoma mexicanum) liver bile acid-binding protein bound to cholic and oleic acid
Proteins, 64:79-88, 2006

PubMed Abstract: The family of the liver bile acid-binding proteins (L-BABPs), formerly called liver basic fatty acid-binding proteins (Lb-FABPs) shares fold and sequence similarity with the paralogous liver fatty acid-binding proteins (L-FABPs) but has a different stoichiometry and specificity of ligand binding. This article describes the first X-ray structure of a member of the L-BABP family, axolotl (Ambystoma mexicanum) L-BABP, bound to two different ligands: cholic and oleic acid. The protein binds one molecule of oleic acid in a position that is significantly different from that of either of the two molecules that bind to rat liver FABP. The stoichiometry of binding of cholate is of two ligands per protein molecule, as observed in chicken L-BABP. The cholate molecule that binds buried most deeply into the internal cavity overlaps well with the analogous bound to chicken L-BABP, whereas the second molecule, which interacts with the first only through hydrophobic contacts, is more external and exposed to the solvent.

PubMed: 16555310
DOI: 10.1002/prot.20961

Experimental method

X-RAY DIFFRACTION (2.5 Å)