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Spectroscopic investigations on the binding site of bovine hepatic fatty acid binding protein. Evidence for the existence of a single binding site for two fatty acid molecules


Spectroscopic investigations on the binding site of bovine hepatic fatty acid binding protein. Evidence for the existence of a single binding site for two fatty acid molecules



Chemistry and Physics of Lipids 38(1-2): 159-173



ISSN/ISBN: 0009-3084

PMID: 4064218

DOI: 10.1016/0009-3084(85)90064-7

The hydrophobic region of the binding site of a bovine fatty acid binding protein (pI 7.0-FABP) has been characterized using fluorescence and circular dichroism (CD) spectroscopy. Blue-shifts of fluorescence emission maxima and increased lifetimes of naphthylamine dyes, anthroyloxy-fatty acids, pyrene nonanoic acid and trans-parinaric acid indicated a hydrophobic interaction with FABP. The fluorescence quenching of various anthroyloxy-fatty acids by iodide and acrylamide showed lower accessibility to the fluorophore linked to the carbon adjacent to the carbonyl group and towards the methyl end of the fatty acid. Binding stoichiometries were different for fatty acids and their bulky fluorescent analogues. trans-Parinaric acid when bound to FABP showed a complex induced CD-spectrum, which is explained by a close proximity of two ligands in the same binding site. Fluorescent derivatives of phosphatidylcholine with trans-parinaric acid and cholesteryl trans-parinarate did not bind to FABP. Thus, the binding site appears to be constructed for high affinity binding of long chain fatty acids.

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Accession: 041409622

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