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LEE, Jin-Ha,SAITO, Saori,MORI, Haruhide,NISHIMOTO, Mamoru,OKUYAMA, Masayuki,KIM, Doman,WONGCHAWALIT, Jintanart,KIMURA, Atsuo,CHIBA, Seiya Japan Society for Bioscience, Biotechnology, and A 2007 Bioscience, Biotechnology, and Biochemistry Vol.71 No.9
<P>cDNA encoding the bound type trehalase of the European honeybee was cloned. The cDNA (3,001 bp) contained the long 5′ untranslated region (UTR) of 869 bp, and the 3′ UTR of 251 bp including a poly(A) tail, and the open reading frame of 1,881 bp consisting of 626 amino acid residues. The <I>M</I><SUB>r</SUB> of the mature enzyme comprised of 591 amino acids, excluded a signal sequence of 35 amino acid residues, was 69,177. Six peptide sequences analyzed were all found in the deduced amino acid sequence. The amino acid sequence exhibited high identity with trehalases belonging to glycoside hydrolase family 37. A putative transmembrane region similar to trehalase-2 of the silkworm was found in the C-terminal amino acid sequence. Recombinant enzyme of the trehalase was expressed in the methylotrophic yeast <I>Pichia pastoris</I> as host, and displayed properties identical to those of the native enzyme except for higher sugar chain contents. This is the first report of heterologous expression of insect trehalase.</P>