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根据烟草花叶病毒（Ｔｏｂａｃｏｍｏｓａｉｃｖｉｒｕｓ，ＴＭＶ）Ｕ１株系（ＴＭＶ－Ｕ１）序列，人工合成引物，用ＲＴ法合成ｃＤＮＡ后，通过ＰＣＲ技术扩增并克隆了烟草花叶病毒蚕豆株系（ＴＭＶ－Ｂ）的外壳蛋白（ＣＰ）基因和３＇端非编码区。ＤＮＡ序列测定结果表明，外壳蛋白基因全长４８０个碱基，编码１５８个氨基酸，３＇端非编码区全长２０４个碱基，与ＴＭＶ－Ｕ１株系的同源率为１００％。将ＣＰ基因及３＇端非编码区插入ｐＧＥＭＥＸ－１的Ｔ７基因１０中，转入Ｅ．ｃｏｌｉ后诱导表达，聚丙烯酰胺凝胶电泳分析呈现一特异的蛋白带，Ｗｅｓｔｅｒｎ免疫检测证明，该特异带与ＴＭＶ抗血清呈阳性反应。
According to the sequence of Tobacco mosaic virus (TMV) U1 strain (TMV-U1), primers were synthesized and amplified by RT-PCR. The TMV-B ) Coat protein (CP) gene and 3 ’non-coding region. The results of DNA sequence analysis showed that the coat protein gene was 480 bases in length and encoded 158 amino acids. The 3 ’non-coding region was 204 bases in length. The homology was 100% with TMV-U1 strain. The CP gene and the 3 ’noncoding region were inserted into the T7 gene of pGEMEX-1 10 and transferred into E. coli. After induced by E. coli, polyacrylamide gel electrophoresis showed a specific protein band. Western immunization showed that the specific band was positive with TMV antiserum.