کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10765161 | 1050591 | 2010 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Molecular cloning and characterization of a novel family VIII alkaline esterase from a compost metagenomic library
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
بیوشیمی، ژنتیک و زیست شناسی مولکولی
زیست شیمی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Molecular cloning and characterization of a novel family VIII alkaline esterase from a compost metagenomic library Molecular cloning and characterization of a novel family VIII alkaline esterase from a compost metagenomic library](/preview/png/10765161.png)
چکیده انگلیسی
A metagenomic library was constructed from completely fermented compost using a fosmid vector. From a total of 23,400 clones, 19 esterase-positive clones were selected on LB plates containing 1% glyceryl tributyrate as the substrate. The esterase gene of an esterase-positive clone, est2K, was on an ORF of 1299 bp and encoded a protein of 432 amino acids. Est2K had a SMTK motif and was a family VIII esterase. Unlike most family VIII esterases, Est2K had a signal peptide of 27 amino acids. The molecular mass and pI of the mature Est2K was calculated to be 44,668 Da and 4.48, respectively. The amino acid sequence of Est2K showed 72% identity with that of EstC, an esterase of an uncultured bacterium from leachate. The purified Est2K was optimally active at pH 10.0 and 50 °C. Est2K was stable in the presence of 30% methanol and exhibited a 2.4-fold higher activity in the presence of 5% methanol than in the presence of 1% isopropanol. Est2K preferred short to medium length p-nitrophenyl esters, especially p-nitrophenyl butyrate, as the substrate. Est2K did not hydrolyze β-lactam antibiotics ampicillin and nitrocefin, even though Est2K showed the highest similarity to EstC.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Biochemical and Biophysical Research Communications - Volume 393, Issue 1, 26 February 2010, Pages 45-49
Journal: Biochemical and Biophysical Research Communications - Volume 393, Issue 1, 26 February 2010, Pages 45-49
نویسندگان
Yong Ho Kim, Eun Ju Kwon, Sung Kyum Kim, Yu Seok Jeong, Jungho Kim, Han Dae Yun, Hoon Kim,