Abstract: The information of protein subcellular localization is important to our understanding of a protein function . The protein encoded by At4g22890 was predicted to be an Arabidopsis chloroplast protein . The 5′208 bp fragment of this gene was cloned and fused with GFP to construct a binary vector pMON530-cTP-GFP for genetic transformation . On confocal laser-scanning microscopy, green fluorescent signals were localized in chloroplasts in transgenic Arabidopsis plants, suggesting that the 208 bp DNA fragment encodes a peptide targeting to chloroplast . The results suggest that At4g22890 encodes a chloroplast protein .

Key words: Arabidopsis thaliana

摘要： 蛋白质的亚细胞定位信息对于深入了解该蛋白质的功能具有重要意义。本文对一个预测的拟南芥叶绿体未知功能基因At4g22890 编码蛋白进行了叶绿体定位研究。我们克隆了该基因5′端长208 bp 的DNA 片段, 与绿色荧光蛋白(GFP) 基因构建重组表达载体pMON530-cTP-GFP, 经农杆菌介导转化拟南芥。转基因植株经激光共聚焦显微镜观察, GFP 荧光仅在叶绿体中观察到, 表明所克隆的DNA 序列编码的多肽能够将At4g22890 编码蛋白质引导进入叶绿体, 由此推测该蛋白质为叶绿体蛋白质。

关键词: 拟南芥, 转运肽, 融合蛋白, 叶绿体定位