Biochemical and Structural Characterization of a Ureidoglycine Aminotransferase in the Klebsiella pneumoniae Uric Acid Catabolic Pathway

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• 作者：Jarrod B. French ; Steven E. Ealick
• 刊名：Biochemistry
• 出版年：2010
• 出版时间：July 27, 2010
• 年：2010
• 卷：49
• 期：29
• 页码：5975-5977
• 全文大小：705K
• 年卷期：v.49,no.29(July 27, 2010)
• ISSN：1520-4995

文摘

Many plants, fungi, and bacteria catabolize allantoin as a mechanism for nitrogen assimilation. Recent reports have shown that in plants and some bacteria the product of hydrolysis of allantoin by allantoinase is the unstable intermediate ureidoglycine. While this molecule can spontaneously decay, genetic analysis of some bacterial genomes indicates that an aminotransferase may be present in the pathway. Here we present evidence that Klebsiella pneumoniae HpxJ is an aminotransferase that preferentially converts ureidoglycine and an α-keto acid into oxalurate and the corresponding amino acid. We determined the crystal structure of HpxJ, allowing us to present an explanation for substrate specificity.