title: Binding properties of Echinococcus granulosus fatty acid binding protein.
abstract: EgFABP1 is a developmentally regulated intracellular fatty acid binding protein characterized in the larval stage of parasitic platyhelminth Echinococcus granulosus. It is structurally related to the heart group of fatty acid binding proteins (H-FABPs). Binding properties and ligand affinity of recombinant EgFABP1 were determined by fluorescence spectroscopy using cis- and trans-parinaric acid. Two binding sites for cis- and trans-parinaric acid were found (K(d(1)) 24+/-4 nM, K(d(2)) 510+/-60 nM for cis-parinaric acid and K(d(1)) 32+/-4 nM, K(d(2)) 364+/-75 nM for trans-parinaric). A putative third site for both fatty acids is discussed. Binding preferences were determined using displacement assays. Arachidonic and oleic acids presented the highest displacement percentages for EgFABP1. The Echinococcus FABP is the unique member of the H-FABP group able to bind two long chain fatty acid molecules with high affinity. Structure-function relationships and putative roles for EgFABP1 in E. granulosus metabolism are discussed.
authors.affiliation: Sección Bioquímica, Facultad de Ciencias, Montevideo, Uruguay.
authors.forename: G
authors.initials: G
authors.lastname: Alvite
authors.forename: S M
authors.initials: SM
authors.lastname: Di Pietro
authors.forename: J A
authors.initials: JA
authors.lastname: Santomé
authors.forename: R
authors.initials: R
authors.lastname: Ehrlich
authors.forename: A
authors.initials: A
authors.lastname: Esteves
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001665:Binding Sites; D001667:Binding, Competitive; D002352:Carrier Proteins / Q000096:biosynthesis / Q000737:chemistry / Q000378:metabolism*; D004446:Echinococcus / Q000737:chemistry / Q000196:embryology / Q000378:metabolism*; D004926:Escherichia coli / Q000378:metabolism; D050556:Fatty Acid-Binding Proteins; D005227:Fatty Acids / Q000737:chemistry / Q000378:metabolism*; D005231:Fatty Acids, Unsaturated / Q000737:chemistry; D029941:Fish Proteins; D007814:Larva / Q000378:metabolism; D008969:Molecular Sequence Data; D010957:Plasmids; D011994:Recombinant Proteins / Q000378:metabolism; D016415:Sequence Alignment; D013050:Spectrometry, Fluorescence; D013329:Structure-Activity Relationship
chemical_list: D002352:Carrier Proteins; C425124:FABP-1 protein, Lateolabrax japonicus; D050556:Fatty Acid-Binding Proteins; D005227:Fatty Acids; D005231:Fatty Acids, Unsaturated; D029941:Fish Proteins; D011994:Recombinant Proteins; C013641:parinaric acid