Abstract:
:This study addresses the problem of poor expression of somatotropin (ST) gene in E. coli and describes expression enhancement through silent and non-silent gene modifications. A series of constructs with codon optimization, substitution, deletion or addition in the 5'-region of the sequence encoding bubaline ST (BbST) were prepared. In the native form, the BbST expression was barely discernible on SDS-gel of the total E. coli cellular proteins (TCP). Introduction of silent and non-silent mutations in +2 to +8 codons, however, raised the expression levels to varying extents. In some constructs, a single base variation, i.e., G-->A or G-->C led to a remarkable increase in BbST expression (up to 28% of the TCP) whereas in the case of G-->T substitution the expression dropped to undetectable levels. Deletion of native GCC codon and addition of CAUCAC repeat thrice at +2 position enhanced the expression up to 48%, while insertion of NGG codons at the same position caused just a modest increase in expression. Differences in expression appeared as if related to the nature of early downstream codons (especially +2) and the stability of mRNA secondary structure although the levels of intracellular mRNA pools, as analyzed by real-time RT-PCR were quite similar. Overall, the study highlights the importance of 5'-end codon adaptations in solving the problems encountered in expressing the eukaryotic genes in E. coli.
journal_name
J Biotechnoljournal_title
Journal of biotechnologyauthors
Sadaf S,Khan MA,Akhtar MWdoi
10.1016/j.jbiotec.2008.03.010subject
Has Abstractpub_date
2008-06-01 00:00:00pages
134-9issue
2eissn
0168-1656issn
1873-4863pii
S0168-1656(08)00104-1journal_volume
135pub_type
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journal_title:Journal of biotechnology
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journal_title:Journal of biotechnology
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journal_title:Journal of biotechnology
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journal_title:Journal of biotechnology
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journal_title:Journal of biotechnology
pub_type: 杂志文章
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journal_title:Journal of biotechnology
pub_type: 杂志文章
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journal_title:Journal of biotechnology
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journal_title:Journal of biotechnology
pub_type: 杂志文章
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journal_title:Journal of biotechnology
pub_type: 杂志文章
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journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2008.03.016
更新日期:2008-06-01 00:00:00
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journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2009.01.013
更新日期:2009-03-25 00:00:00
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journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2012.06.029
更新日期:2012-10-31 00:00:00
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journal_title:Journal of biotechnology
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journal_title:Journal of biotechnology
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journal_title:Journal of biotechnology
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journal_title:Journal of biotechnology
pub_type: 杂志文章,评审
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abstract::Candida antarctica lipase B (CALB) has been employed as an efficient catalyst in the preparation of many flavor esters. A CALB-displaying yeast whole-cell biocatalyst could be an attractive alternative to commercial immobilized CALB because of its low-cost preparation and high enzymatic activity. We investigated the p...
journal_title:Journal of biotechnology
pub_type: 杂志文章
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更新日期:2012-05-31 00:00:00
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journal_title:Journal of biotechnology
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abstract::A simple and accurate analysis system for the estimation of recombination efficiency in vivo using fluorescence-activated cell sorting (FACS) was designed and was subsequently used to compare the efficiency of recombination related to different spacer mutants. F(3) and F(5) mutant sequences were used for Flpe-mediated...
journal_title:Journal of biotechnology
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更新日期:2007-01-10 00:00:00
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journal_title:Journal of biotechnology
pub_type: 杂志文章
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更新日期:2017-08-20 00:00:00
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journal_title:Journal of biotechnology
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更新日期:2016-04-10 00:00:00
abstract::Several green fluorescent protein (Gfp) mutants with increased cellular fluorescence compared to the wildtype protein have recently been generated. We have expressed and compared wildtype Gfp and mutants S65T, F100S/ M154T/V164A, F64L/S65T, and S65A/V68L/S72A under identical growth conditions in CHO and Saccharomyces ...
journal_title:Journal of biotechnology
pub_type: 杂志文章
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更新日期:1998-06-11 00:00:00
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journal_title:Journal of biotechnology
pub_type: 杂志文章
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