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Molecular cloning and phylogenetic analysis of the ribosomal protein S19 from amphioxus Branchiostoma belcheri tsingtaunese

机译:文昌鱼双歧杆菌核糖体蛋白S19的分子克隆和系统发育分析

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摘要

An amphioxus cDNA, AmphiS19, encoding the ribosomal protein S19 was isolated from the gut cDNA library of Branchiostoma belcheri tsingtaunese. The cDNA contains a 444 base pair,(bp) open reading frame, flanked by a 27 bp 5'-untranslated region and a 138 bp 3' untranslated region. The ORF encodes a putative 147 amino acid protein with a calculated molecular mass of 16,222 Da. Alignment of the complete amino acid sequences of 14 eukaryotic S19 revealed that AmphiS19 exhibited > 71.0 % similarity to all known vertebrate homologues and < 59.9 % to those of the other eukaryotes, including invertebrates. The phylogenetic analysis based on the amino acids of invertebrate and vertebrate S19 proteins showed that the amphioxus protein was at the base of a clade of vertebrate S19 proteins, indicating that amphioxus is not only the sister group of extant vertebrates but also the basal lineage of chordates.
机译:从Belcheriostoma belcheri tsingtaunese的肠道cDNA文库中分离出编码核糖体蛋白S19的双歧杆菌cDNA,AmphiS19。该cDNA包含一个444个碱基对的(bp)开放阅读框,其侧翼是一个27bp的5′非翻译区和一个138bp的3′非翻译区。 ORF编码一个推定的147个氨基酸蛋白质,计算的分子量为16,222 Da。 14个真核生物S19的完整氨基酸序列的比对显示,AmphiS19与所有已知的脊椎动物同源物显示> 71.0%的相似性,与包括无脊椎动物在内的其他真核生物的同源性<59.9%。根据无脊椎动物和脊椎动物S19蛋白的氨基酸进行的系统发育分析表明,文昌鱼蛋白位于脊椎动物S19蛋白进化枝的基础上,表明文昌鱼不仅是现存脊椎动物的姊妹群,而且还是脊索动物的基础谱系。

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