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  • Title: The purification and characterization of a fatty acid binding protein specific to pig (Sus domesticus) adipose tissue.
    Author: Armstrong MK, Bernlohr DA, Storch J, Clarke SD.
    Journal: Biochem J; 1990 Apr 15; 267(2):373-8. PubMed ID: 2334399.
    Abstract:
    Western-blot analysis using antiserum to 3T3-L1-cell fatty acid binding protein (FABP) revealed that pig adipose tissue contains a 15 kDa protein immunologically similar to the murine protein. This 15 kDa protein was purified from pig adipose tissue by sequential application of Sephadex G-50 gel filtration, cation exchange and covalent chromatography on Thiol-Sepharose-4B. The purity of the pig protein was established by two-dimensional polyacrylamide-gel electrophoresis. Isoelectric focusing indicated that the pig adipose FABP (a-FABP) exists with two charge isoforms (pI 5.1 and 5.2), both of which persist after delipidation. The N-terminus of the purified pig a-FABP was blocked; however, cleavage with CNBr allowed recovery of a 12-amino-acid peptide which was identical with the murine a-FABP sequence (residues 36-48) at 10 of 12 positions. The pig a-FABP bound 12-(9-anthroyloxy)oleic acid saturably and stoichiometrically, with an apparent dissociation constant of 1.0 microM. Northern-blot analysis using the cDNA for the murine 3T3-L1 FABP revealed that the pig a-FABP was expressed exclusively in adipose tissue.
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