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Isolation and partial characterization of the natural inhibitor of dopa autoxidation in skin.

Guinea pig skin contains an inhibitor of dopa autoxidation. This material has been isolated from aqueous skin extracts by gel-filtration and electrophoresis, and its activity measured at each stage by incubation with 10 -3 M DOPA at 37°C. A series of reactions showed its chemical properties to be those of a protein. It was denatured by 8M urea, precipitated by 5% tri-chloroacetic acid and heat, acid-labile, but UV-stable. Its molecular weight, as measured by gel-filtration, was 6,000, but the molecules polymerised on storage without loss of activity. Its activity did not depend on sulfhydryl groups. The inhibitor was present in both black and white skins, and all other tissues examined.