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1. A new, simple and high-yield procedure is described for the purification of hepatic fatty-acid-binding protein from rat liver using naphthylaminodecyl-agarose as an affinity column. 2. Cysteine-69 is shown to react slowly, but quantitatively, with 5,5'-dithiobis-(2-nitrobenzoic acid) (DTNB), indicating that the thiol group is free, but may be buried within the protein. 3. Fatty acids do not affect the DTNB reactivity of this cysteine residue; however, cysteine reactivity is enhanced in the presence of haem and oleoyl-CoA. 4. Fatty-acid-binding protein that has been modified with DTNB is still able to bind the fluorescent fatty acid 11-(dansylamino)undecanoic acid, indicating that cysteine-69 may be remote from the fatty-acid-binding site.

Studies on fatty-acid-binding proteins. The purification of rat liver fatty-acid-binding protein and the role of cysteine-69 in fatty acid binding