title: Amino acid sequence, binding properties and evolutionary relationships of the basic liver fatty-acid-binding protein from the catfish Rhamdia sapo.
abstract: The complete amino acid sequence of a basic liver fatty acid-binding protein (L-FABP) from catfish (Rhamdia sapo) was determined. Alignment of sequences shows that it has more similarity to chicken basic L-FABP than to mammalian L-FABP. The phylogenetic analysis suggests that basic L-FABP from catfish, chicken and iguana diverged from the mammalian protein before the fish-tetrapod divergence, thus implying that the two types are encoded by different genes. Supporting this conclusion, a 14-kDa protein, structurally closely related to mammalian L-FABP, was isolated from catfish intestine, indicating the presence of the two genes in the same species. The catfish basic L-FABP binds only one fatty acid/molecule, while mammalian L-FABP bind two. The former has more affinity for trans-parinaric acid than for cis-parinaric acid, in constrast to the latter proteins.
authors.affiliation: Instituto de Química y Fisicoquímica Biológicas, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Argentina.
authors.forename: S M
authors.initials: SM
authors.lastname: Di Pietro
authors.forename: E C
authors.initials: EC
authors.lastname: Dell'Angelica
authors.forename: J H
authors.initials: JH
authors.lastname: Veerkamp
authors.forename: N
authors.initials: N
authors.lastname: Sterin-Speziale
authors.forename: J A
authors.initials: JA
authors.lastname: Santomé
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D002352:Carrier Proteins / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism; D002397:Catfishes / Q000235:genetics*; D002645:Chickens; D019143:Evolution, Molecular; D000071438:Fatty Acid-Binding Protein 7; D050556:Fatty Acid-Binding Proteins; D005227:Fatty Acids / Q000378:metabolism*; D006801:Humans; D007076:Iguanas; D007413:Intestinal Mucosa / Q000378:metabolism; D007700:Kinetics; D008099:Liver / Q000378:metabolism*; D051379:Mice; D008969:Molecular Sequence Data; D018996:Myelin P2 Protein / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism; D009363:Neoplasm Proteins; D009419:Nerve Tissue Proteins; D010446:Peptide Fragments / Q000737:chemistry; D010802:Phylogeny; D051381:Rats; D016415:Sequence Alignment; D017386:Sequence Homology, Amino Acid; D012754:Sharks; D025521:Tumor Suppressor Proteins
chemical_list: D002352:Carrier Proteins; C493319:FABP1 protein, human; C107608:FABP7 protein, human; C493320:Fabp1 protein, mouse; C493321:Fabp1 protein, rat; C082667:Fabp5 protein, mouse; C086936:Fabp7 protein, mouse; C490174:Fabp7 protein, rat; D000071438:Fatty Acid-Binding Protein 7; D050556:Fatty Acid-Binding Proteins; D005227:Fatty Acids; D018996:Myelin P2 Protein; D009363:Neoplasm Proteins; D009419:Nerve Tissue Proteins; D010446:Peptide Fragments; D025521:Tumor Suppressor Proteins