Natural ligand binding and transfer from liver fatty acid binding protein (LFABP) to membranes |
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Authors: | Eduardo De Geró nimo,Robert M. Hagan,David C. Wilton,Betina Có rsico |
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Affiliation: | 1. INIBIOLP, Facultad de Ciencias Médicas, Universidad Nacional de La Plata. Calle 60 y 120, 1900, La Plata, Argentina;2. Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Rivadavia 1917, C1033AAJ, Buenos Aires, Argentina;3. School of Biological Sciences, University of Southampton, Boldrewood Campus, Southampton SO16 7PX, UK |
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Abstract: | Liver fatty acid-binding protein (LFABP) is distinctive among fatty acid-binding proteins because it binds more than one molecule of long-chain fatty acid and a variety of diverse ligands. Also, the transfer of fluorescent fatty acid analogues to model membranes under physiological ionic strength follows a different mechanism compared to most of the members of this family of intracellular lipid binding proteins. Tryptophan insertion mutants sensitive to ligand binding have allowed us to directly measure the binding affinity, ligand partitioning and transfer to model membranes of natural ligands. Binding of fatty acids shows a cooperative mechanism, while acyl-CoAs binding presents a hyperbolic behavior. Saturated fatty acids seem to have a stronger partition to protein vs. membranes, compared to unsaturated fatty acids. Natural ligand transfer rates are more than 200-fold higher compared to fluorescently-labeled analogues. Interestingly, oleoyl-CoA presents a markedly different transfer behavior compared to the rest of the ligands tested, probably indicating the possibility of specific targeting of ligands to different metabolic fates. |
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Keywords: | FABP, fatty acid binding protein LFABP, liver fatty acid binding protein LCFA, long-chain fatty acids FA, fatty acid AOFA, anthroyloxy fatty acids 12AO, 12-(9-anthroyloxy) oleic acid OA, oleic acid PA, palmitic acid SUV, small unilamellar vesicles EPC, egg phosphatidylcholine PS, phosphatidylserine CL, cardiolipin |
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