Expression of two uricase (Nodulin-35) genes in a non-ureide type legume, Medicago sativa

文献类型： 外文期刊

第一作者： Cheng, XG

作者： Cheng, XG;Nomura, M;Takane, K;Kouchi, H;Tajima, S

作者机构：

关键词： alfalfa;gene expression;Medicago sativa;Nod-35;ureide;uricase (EC 1.7.3.3)

期刊名称：PLANT AND CELL PHYSIOLOGY （ 影响因子：4.927； 五年影响因子：5.516 ）

ISSN： 0032-0781

年卷期： 2000 年 41 卷 1 期

页码：

收录情况： SCI

摘要： Two cDNA clones, MsU2 and MsU9 encoding uricase (EC 1.7.3.3, Nodulin-35) were isolated from a cDNA library prepared from nodule tissues of alfalfa, Medicago sativa, plants. Both MsU2 and MsU9 encoded 308 amino acid polypeptides with a difference of 5 amino acids, and the deduced amino acid sequences shared 98% homology. Between these two cDNA clones and uricase genes of soybean which were designated as Nod-35s, more than 80% identity was observed in nucleotides and deduced amino acid sequences, suggesting that these MsU2 and MsU9 are homologs of Nod-35. Using the reverse transcription-PCR technique, we detected the transcripts of these two genes in almost all tissues of alfalfa. The operation of uricase genes was confirmed by the presence of ureide in the xylem sap and uricase activity in the nodules. In situ hybridization analysis revealed that MsU2 and MsU9 were expressed only in uninfected cells of the infected zone of the nodule tissue. The cell specific-expression of the two uricase genes was observed in an identical manner to that of Nod-35 in soybean nodules.

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