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The purification and characterization of human kidney L-arginine:glycine amidinotransferase
Authors:M D Gross  M A Eggen  A M Simon  J F Van Pilsum
Institution:1. Department of Medical Genetics, Oslo University Hospital, P.B 4956 Nydalen, 0424 Oslo, Norway;2. Laboratory Genetic Metabolic Diseases, Academic Medical Center, Meibergdreef 9, 1105 AZ, Amsterdam, The Netherlands;3. Department of Neurohabilitation, Oslo University Hospital, P.B 4956 Nydalen, 0424 Oslo, Norway
Abstract:Human kidney L-arginine:glycine amidinotransferase (transamidinase) has been purified to a homogeneous state as defined by native and sodium dodecyl sulfate gel electrophoresis and by ultracentrifugation (sedimentation equilibrium) experiments. The four steps in the isolation procedure were chromatography with DEAE-cellulose, gel filtration with Sephadex G-150, chromatography with phenyl Sepharose, and high-pressure liquid chromatography with hydroxylapatite. The final product represented a 90-fold purification of the enzyme. Human kidney transamidinase is a dimer with a molecular mass of 89,000 Da and subunit masses of 44,000 Da. The Km for arginine and glycine were both 2.5 mM and the Vmax was 0.5 mumol ornithine/min/mg protein. The ultraviolet absorption spectrum, specific activity, and isoelectric points were determined for human kidney transamidinase. Multiple forms of the enzyme were obtained by isoelectric focusing. Human kidney transamidinase cross-reacted with polyclonal antibodies raised to rat kidney transamidinase. All of the properties of human kidney transamidinase that we have examined were similar to those of rat kidney transamidinase. A close evolutionary relationship between the rat and human kidney transamidinase is suggested.
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