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利用Shuffling技术改良纤维素葡聚糖内切酶(EGI)酶活

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摘要 本文以纤维素葡聚糖内切酶基因为基础,利用shuffling改组技术,经过DNaseI降解、PrimerlessPCR、TouchdownPCR对纤维素内切酶基因进行了突变和改组,然后将改组的纤维素内切酶基因插入原核表达载体pET-28a(+)中,构建了重组子突变体库。通过羧甲基纤维素钠(CMC-Na)培养基的分离筛选,得到活性比较高的纤维素葡聚糖酶菌株。对这些菌株通过3,5-二硝基水杨酸法(DNS)进行酶活检测,成功获到比原来酶活高5.75倍的菌株,酶活表达量56.52U/mL,对其诱导表达条件进行优化结果表明在50℃,异丙基-β-D-硫代半乳糖苷(IPTG)终浓度为0.1mmol/L条件下,酶的产量最高。
出处 《农业机械》 2012年第16期137-141,共5页 Farm Machinery
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