一个麻疯树RING型锌指蛋白基因JcRFP1的克隆及表达

首次从麻疯树胚乳cDNA丈库中克隆得到一个RJNG型锌指蛋白基（GenBank登录号为JF920726），命名为JcRFP1。该cDNA长度为728bp，包含编码JcRFP1蛋白的完整开放阅读框（516bp）。脚，基因在麻疯树各器官中均检测到表达且表达量依次为：叶〉茎〉花〉果实〉种子〉根。将克隆到的JcRFP1基因的cDNA序列连接到表达载体pET32a（＋）上，导入BL21（DE3）pLysS菌株，成功诱导表达相对分子质量为33．2kDa的可溶性融合蛋白。该融合蛋白免疫新西兰大白兔，得到效价为1：6500的抗血清。研究表明，JcRFP1蛋白具有体外泛素连接酶E3活性，在麻疯树体内可能参与油菜素甾醇信号转导途径。

Cloning and Expression of a RING Finger Protein Gene JcRFP1 from Jatropha curcas L.

A novel RiNG finger protein gene was cloned from Jatropha curcas endosperm cDNA library （Gen- Bank Accession No. JF920726）, named JcRFP1. The cDNA length was 728 bp including the complete coding sequence （516 bp） of JcRFP1. JcRFP1 gene expression could be detected in all organs ofJ. curcas, and the expression levels are different as follows leaf〉stem〉flower〉fruit〉seed〉root. JcRFP1 cDNA was ligated into the expression plasmid pET-32a （＋） and a soluble fusion protein with the molecular weight of 33.2 kDa was expressed successfully in E. coli strain BL21 （DE3） pLysS including the recombinant plasmid pET32a （＋）-JcRFP1△N. Thereafter, the fusion protein was used to immunize the New Zealand white rabbits and the polyclonal antibody was obtained, which could be diluted into 1： 6 500 during western blot analysis. The study showed JcRFP 1 had in vitro ubiquitin ligase （E3） activity and might participate in brassinosteroid signal trans- duction pathways in J.curcas.