Determination of serum biotinidase activity with biotinyl derivatives of lodotyramines as substrates.

Abstract

We synthesized biotinylated mono- and di-iodotyramine and their radioactive counterparts and used these substances as substrates to estimate serum biotinidase activity in a radioassay system. The Km values determined for mono- and di-iodobiotinyl derivatives were 15.8 and 25.9 microM, respectively, whereas, the maximum velocities of the enzymatic reaction… (More)

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