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Rat liver fatty acid-binding protein (FABP) is able to bind a wide range of non-polar anionic ligands, including lysophospholipids. In order to understand the nature of lysophospholipid interactions with liver FABP, the binding of natural lysophospholipids and two fluorescent analogues, N-(5-dimethylaminonaphthalenesulphonyl)-1-palmitoyl-sn-glycero-3- phosphoethanolamine (dansyl lysoPE) and 1-(O-[11-(5-dimethylaminonaphthalene-sulphonyl)amino]undecyl)-sn-glycero -3- phosphocholine (dansyl-C11-lysoPAF), has been investigated. The results confirmed the ability of liver FABP to bind lysophospholipids with KD values in the range of 1-2 microM, and a 1:1 binding stoichiometry was indicated. Binding of fluorescent lysophospholipids was enhanced with the FABP mutant, R122Q, possibly due to increased flexibility of the binding cavity as a result of reduced hydrogen-bonding constraints. The fluorescent lysophospholipids also bound to albumin, with KD values in the range 0.1-1.0 microM, and could be displaced by oleic acid. The fluorescence characteristics of the dansyl lysophospholipid analogue dansyl-C11-lyso-PAF suggested that this probe binds to the same site(s) on albumin as the fluorescent fatty acid probe 11-(5-dimethylaminonaphthalene-sulphonylamino)-undecanoic acid (DAUDA).

The binding of natural and fluorescent lysophospholipids to wild-type and mutant rat liver fatty acid-binding protein and albumin