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作 者:陈晓斌[1] 林建平[1] 金志华[1] 岑沛霖[1]
出 处:《微生物学通报》2006年第5期54-58,共5页Microbiology China
摘 要:从嗜热硫矿硫化叶菌(Sulfolobussolfataricus)ATCC35092的基因组中用PCR方法扩增得到编码MTSase和MTSase的基因,分别将其插入原核表达载体pTrc99a中,并转入大肠杆菌BL21(DE3),进行诱导表达。MTSase和MTHase酶活产率达到了31·3U/g(wetcell)和403U/g(wetcell)。在75℃,pH5·0条件下,两酶联合作用转化淀粉生产海藻糖,当淀粉浓度为15%,DE值为10时,海藻糖转化率最高为53·6%。The genes of maltooligosyl trehalose synthase (MTSase) and maltooligosyl trehalose tetrahydmlase (MTHase) from Sulfolobus solfataricus ATCC 35092 were amplified using PCR. The expression plasmids, pTrc99a-MTSase and pTrc99a-MTHase, were constructed by inserting these two DNA fragments into E. coli expression vector pTrc99a. The specific activity of MTSase and MTHase in E. coli BL21 ( DE3 ) at optimal fermentation conditions reached 31.3U/g (wet cell) and 403U/g (wet cell), respectively. The biotransformation of partially hydmlyzed starch to trehalose catalyzed by MTSase and MTHase was carried out at 75℃ and pH 5.0. The highest yield of trehalose (ca. 53.6% ) was gained when the original starch concentration was 15% (w/v) and the DE value was 10.
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