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首页> 外文期刊>Biochimica et Biophysica Acta. Protein Structure and Molecular Enzymology >Ribonucleases from rat and bovine liver: purification, specificity and structural characterization
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Ribonucleases from rat and bovine liver: purification, specificity and structural characterization

机译:大鼠和牛肝中的核糖核酸:纯化,特异性和结构表征

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The presence of four members of the pyrimidine-specific ribonuclease superfamily was demonstrated in rat liver. Three of them (RL1, RL2 and RL3) were purified and showed ribonuclease activity at pH 7.5 with yeast RNA as substrate. RL1 is identical to rat pancreatic ribonuclease (ribonuclease 1). N-terminal sequence analysis showed the presence of the native protein and several N-terminally degraded components. RL2 and RL3 were N-terminally blocked proteins. After acidic cleavage or CNBr digestion, several parts of their sequences were determined. RL2 has high sequence similarity with neurotoxin-type ribonucleases (ribonucleases 2, 3 and 6). The amino acid sequence of rat liver-type ribonuclease (ribonuclease 4) was determined from a liver cDNA library. It differs at about 20% of the amino acid positions from other mammalian liver-type ribonucleases. The sequence of a peptide of RL3 was identical to that derived from the cDNA sequence of the liver-type ribonuclease. A contaminant of the RL3 fraction had a high sequence similarity with mouse and other mammalian angiogenins. Bovine, porcine and rat liver-type ribonucleases showed a strong preference for poly(U) over poly(C). This preference is a unique property of the liver-type enzymes of the ribonuclease superfamily.
机译:在大鼠肝脏中证实了嘧啶特异性核糖核酸酶超家族的四个成员的存在。纯化了其中的三个(RL1,RL2和RL3),并以酵母RNA为底物在pH 7.5下显示了核糖核酸酶活性。 RL1与大鼠胰腺核糖核酸酶(核糖核酸酶1)相同。 N-末端序列分析表明存在天然蛋白质和一些N-末端降解的组分。 RL2和RL3是N端封闭的蛋白。在酸性切割或CNBr消化后,确定了其序列的几个部分。 RL2与神经毒素型核糖核酸酶(核糖核酸2、3和6)具有高度的序列相似性。从肝脏cDNA文库中确定大鼠肝脏型核糖核酸酶(核糖核酸酶4)的氨基酸序列。它与其他哺乳动物肝型核糖核酸酶的氨基酸位置相差约20%。 RL3的肽序列与肝型核糖核酸酶的cDNA序列相同。 RL3级分的污染物与小鼠和其他哺乳动物血管生成素具有高度的序列相似性。牛,猪和大鼠肝型核糖核酸酶均较聚(C)更偏爱聚(U)。这种偏好是核糖核酸酶超家族的肝型酶的独特性质。

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