【摘要】 以前期构建的草鱼肠道cDNA文库中β胸腺素EST序列为基础,应用cDNA末端快速扩增（RACE）技术扩增草鱼胸腺素β₁₁(thymosinβ₁₁,Tβ₁₁)的cDNA序列全长（NCBI登录号:HM120850）,该序列长320 bp,5’非翻译区47 bp,3’非翻译区141 bp,包含一个132 bp的开放读码框,编码43个氨基酸残基,蛋白质等电点为5.17,分子大小为4892 Da.与其他脊椎动物的同源性对比结果显示,草鱼与斑马鱼胸腺素β₁₁的同源性最高,达到93.0%.结构预测显示草鱼胸腺素β₁₁拥有典型的β胸腺素家族典型的二级结构.更多还原

【Abstract】 The thymosinβ₁₁ EST sequence was picked out from the cDNA library of Ctenopharyngodon idellus to design the RACE primers.The full length cDNA sequence of thymosinβ₁₁（GenBank accession number:HM120850） from C.idellus intestine was cloned by rapid amplification of cDNA ends（RACE） method.The full langth of this gene’s cDNA is 320 bp.It has a 47 bp 5’-untranslated region（UTR） and a 141 bp 3’-UTR.The open reading frame（ORF） of this gene’s cDNA is 132 bp which putatively encodes 43 amino acids with the isoelectric point of 5.17 and molecular weight of 4892 Da.Multiple alignments showed that the deduced amino acid sequence ofβ-thymosins from grass crap shares a high degree of identity withβ-thymosins sequences from other species,and the highest homology specie is Danio rerio,（93.0%）.Secondary structure prediction analysis indicated that secondary structure of C. idellu’s thymosinβ₁₁ is highly similar with otherβ-thymosins.更多还原