食品科学 ›› 2008, Vol. 29 ›› Issue (12): 389-392.

• 生物工程 • 上一篇    下一篇

水生栖热菌Thermus aquaticus FL-03嗜热麦芽糖转葡萄糖基酶基因的克隆及表达

 刘佳欢, 于寒松, 王玉华, 胡耀辉   

  1. 吉林农业大学食品科学与工程学院; 吉林大学植物科学学院;
  • 出版日期:2008-12-15 发布日期:2011-12-08

Cloning and Expression of Thermus aquaticus FL-03 Thermophil Amylomaltase Gene

 LIU  Jia-Huan, YU  Han-Song, WANG  Yu-Hua, HU  Yao-Hui   

  1. 1.College of Food Science and Engineering,Jinlin Agricultural University,Changchun 130118,China; 2.College of Plant Science,Jilin University,Changchun 130062,China
  • Online:2008-12-15 Published:2011-12-08

摘要: 以水生栖热菌FL-03菌株的基因组DNA为模板,PCR扩增编码嗜热麦芽糖转葡萄糖基酶的基因(MalQ)片段,克隆至pET-28a(+)原核表达载体,转化E.coli BL21(DE3),IPTG诱导表达,对表达产物进行SDS-PAGE和Western blotting分析鉴定。重组蛋白经70℃钝化离心除杂蛋白后,经SDS-PAGE检测,可见单一条带。纯化酶液以10%麦芽糖为底物,经TLC法分析表明该酶具有转葡萄糖基的活性,比活力提高近5倍,且活力回收率达70%,具有重要的工业应用前景。

关键词: 水生栖热菌FL-03, 麦芽糖转葡萄糖基酶, 基因克隆, 原核表达, 纯化

Abstract: MalQ gene was amplified by PCR with Thermus aquaticus FL-03 genome DNA,the amplified MalQ gene was cloned into prokaryotic expression vector pET-28a(+) and expressed in BL21(DE3) under induction of IPTG. The expressed product was identified with SDS-PAGE and Western blotting. The amylomaltase was purified by inactivation at 70 ℃ and centrifugalization. The glucanothansferase activity of the purified amylomaltase was identified via TLC method with 10% maltose as substrate. The specific activity is improved 5 folds and the residual activity is 70% after purification. The amylomaltase has great potential in application of various industries.

Key words: Thermus aquaticus FL-03, amylomaltase, genecolone prokaryotic expression, purification