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发明授权
US5496719A Polypeptide from Humicola insolens possessing protein disulfide isomerase activity gene encoding the same 失效
来自Humicola insolens的多肽具有编码相同的蛋白质二硫键异构酶活性基因

Polypeptide from Humicola insolens possessing protein disulfide isomerase activity gene encoding the same
摘要：
A highly thermostable polypeptide possessing protein disulfide isomerase (PDI) activity, a gene coding for the polypeptide and a process for producing the polypeptide are provided. The polypeptide possessing PDI activity is characterized by A) having a capability of catalyzing a disulfide exchange in proteins, B) recognizing mainly ribonuclease A as a substrate, C) having a suitable active temperature of 20.degree. to 70.degree. C., D) being stable at a pH value of 6 to 9, and E) having a molecular weight of about 60,000 to 62,000. Since it has a higher thermostability and exhibits a stable activity in a wider dithiothreitol concentration range as compared with the conventional PDI, it is possible to provide a novel enzyme active protein which can be advantageously used for a refolding reaction of certain proteins. Further, a process which enables the polypeptide possessing PDI activity to be efficiently produced using Humicola insolens or a transformant transformed with an expression vector containing the above-described gene is also provided.
摘要（中）：

提供了具有蛋白质二硫键异构酶（PDI）活性的高度热稳定的多肽，编码多肽的基因和产生多肽的方法。 具有PDI活性的多肽的特征在于：A）具有催化蛋白质中二硫键交换的能力，B）主要以核糖核酸酶A为底物，C）具有20〜70℃的合适的活性温度，D）为 在pH值为6〜9的条件下稳定，E）分子量约为60,000〜62,000。 由于与常规PDI相比，具有较高的热稳定性并且在更宽的二硫苏糖醇浓度范围内表现出稳定的活性，因此可以提供可有利地用于某些蛋白质的重折叠反应的新型酶活性蛋白质。 此外，还提供了能够使用Humicola insolens或使用含有上述基因的表达载体转化的转化体有效地产生具有PDI活性的多肽的方法。

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