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Nodule-specific uricase (uricase II) from Phaseolus vulgaris L. was purified to homogeneity by chromatographic methods. Purification data indicated that uricase II is approximately 2% of the total soluble protein from mature nodules. Specific antiserum was raised and used to determine the developmental expression and for immunoselection of polysomes. Uricase II was antigenically detected early in nodule development, 2 to 3 days before nitrogen fixation. Uricase-encoding cDNA clones were isolated by hybridizing a nodule-specific pUC9 cDNA library with labeled mRNA from immunoselected polysomes and a 35,000 molecular weight uricase II-encoding cDNA from soybean. An homologous clone (pNF-UR07) was used to assess the expression pattern of the specific transcript during development. Northern-blot analysis indicated that uricase II mRNA is exclusively expressed in nodule tissue.

Purification, cDNA Cloning, and Developmental Expression of the Nodule-Specific Uricase from Phaseolus vulgaris L.