Degradation of 2-Ketoarginine by Guanidinobutyrase in Arginine Aminotransferase Pathway of<i>Brevibacterium helvolum</i>

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  • Degradation of 2-Ketoarginine by Guanidinobutyrase in Arginine Aminotransferase Pathway of Brevibacterium helvolum.

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Guanidinobutyrase (EC 3.5.3.7) involved in the arginine oxygenase pathway of Brevibacterium helvolum IFO 12073 was found to catalyze also the hydrolysis of 2-ketoarginine (2-keto-5-guanidinovalerate) to 2-ketoornithine (2-keto-5-aminovalerate) and urea, the second step of the arginine aminotransferase pathway. No other enzyme that degraded 2-ketoarginine was found in cells grown on L-arginine. The enzyme hydrolyzed 2-ketoarginine with a relative rate of about 0.7% of that toward 4-guanidinobutyrate. The Km for 2-ketoarginine was 33mM.

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