%0 Journal Article
%T Cloning and Expression of a Thermostable β-glycosidaseGene from Thermus nonproteolyticus HG102<br>耐热β-糖苷酶的基因克隆、表达和耐热性研究
%A HE Xiang-Yuan
%A JIN Cheng
%A ZHANG Shu-Zheng
%A YANG Shou-Jun
%A <br>何向远
%A 金城
%A 张树政
%A 杨寿钧
%J 生物工程学报
%D 2002
%I 
%X The gene coding for beta-glycosidase (EC3.2.1.21) from Thermus nonproteolyticus HG102 has been cloned and expressed in E. coli. The gene open reading frame was 1311 bp and it codes for 436 amino acids. The deduced amino acid sequence of the enzyme showed identity with members of glycosyl hydrolase family I. The enzyme had high content of hydrophobic amino acid (Ala 12.8%, Leu 10.9%), Arg(9.6%), Glu(9.4%) and Pro(8.0%), but low content Cys(0.45%) and Met (0.9%). From the alignment of enzyme amino acid sequence with other glycosyl hydrolase family I members, Glu164 and Glu338 were predicated as the proton donor and nucleophile group. The DNASTAR program was used to predict the secondary structure. According to the Chou-Fasman model, the enzyme has 41.4% of alpha-helics, 16.2%, beta-strands, 14.4%, beta-turns. 14 of the 35 Pro were located at the second sites of beta-turns. Hydrophobic interaction, ion bond, alpha-helics and Pro had important contribution to Tn-gly thermostability.
%K 耐热β-糖苷酶
%K 非解朊栖热菌HG102
%K 耐热性研究
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=90BA3D13E7F3BC869AC96FB3DA594E3FE34FBF7B8BC0E591&jid=A66E90C274451689E69F6F0291467824&aid=5B10A11141D5B9DF&yid=C3ACC247184A22C1&vid=13553B2D12F347E8&iid=CA4FD0336C81A37A&sid=E84BBBDDD74F497C&eid=68D88C2FCF9C3098&journal_id=1000-3061&journal_name=生物工程学报&referenced_num=1&reference_num=33