Ureide biosynthesis in legume nodules.

Shigeyuki Tajima, Mika Nomura, Hiroshi Kouchi

Department of Life Science, Faculty of Agriculture, Kagawa University, Kagawa 761-0795, Japan. tajima@ag.kagawa-u.ac.jp

Frontiers in bioscience : a journal and virtual library 2004 May 1

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In tropical legumes like Glycine, Phaseolus and Vigna sp., ammonia as direct product of symbiotic nitrogen fixation is converted to ureides (allantoin and allantoic acid) and they were translocated to the shoots as nitrogen source. In the xylem sap of soybean in reproductive phase the ureides reached to 60-75% of soluble nitrogen. In nodules infected cells (plastid and mitochondria) and uninfected cells (peroxisome) shares de novo purine biosynthesis and urate oxidation to produce ureides respectively. Current research revealed unique feathers on this symbiotic metabolism, especially on regulation of purine biosynthesis, uricase gene expression and feedback inhibition of ureides to nitrogen fixing activity.

Citation

Shigeyuki Tajima, Mika Nomura, Hiroshi Kouchi. Ureide biosynthesis in legume nodules. Frontiers in bioscience : a journal and virtual library. 2004 May 1;9:1374-81