کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10843140 | 1069184 | 2013 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Production and secretion of Lactobacillus crispatus β-galactosidase in Pichia pastoris
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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: Production and secretion of Lactobacillus crispatus β-galactosidase in Pichia pastoris Production and secretion of Lactobacillus crispatus β-galactosidase in Pichia pastoris](/preview/png/10843140.png)
چکیده انگلیسی
Lactobacillus β-galactosidases are mostly heterodimeric proteins, which are encoded by the two overlapping genes, lacL and lacM, and produced in recombinant prokaryotic systems for higher yield. This is the first report on the expression of a heterodimeric β-galactosidase from Lactobacillus crispatus B470 in Pichia pastoris. The overlapping consecutive genes, lacL and lacM, that shared 17 nucleotides were cloned from the genomic DNA of L. crispatus. A recombinant plasmid harboring both expression cassettes of lacL and lacM was constructed and transformed into P. pastoris GS115 competent cells. Two recombinant P. pastoris strains (GSLac01 and GSLac02) showed the highest β-galactosidase activities of 24.5 and 31.0 U/ml in the culture supernatants, respectively. The recombinant β-galactosidase (LcLacLM) from GSLac02 was purified to electrphoretic homogeneity by ion-exchange chromatography and molecular sieve chromatography. Similar to most Lactobacillus β-galactosidases that operate at moderately thermophilic and weak acid to neutral conditions, LcLacLM showed optimal activity at 50 °C and pH 5.5-6.5. It's the first report on functional and secretory expression of LacLM-type β-galactosidase in eukaryotic system. This strategy might be applied to the expression of other overlapping genes.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Protein Expression and Purification - Volume 92, Issue 1, November 2013, Pages 88-93
Journal: Protein Expression and Purification - Volume 92, Issue 1, November 2013, Pages 88-93
نویسندگان
Chunming Nie, Bo Liu, Yuhong Zhang, Guofen Zhao, Xiaohu Fan, Xiaoyan Ning, Wei Zhang,