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A novel prokaryotic vector for identification and selection of recombinants: direct use of the vector for expression studies in E. coli.

Abstract：

BACKGROUND:The selection of bacterial recombinants that harbour a desired insert, has been a key factor in molecular cloning and a series of screening procedures need to be performed for selection of clones carrying the genes of interest. The conventional cloning techniques are reported to have problems such as screening high number of colonies, generation of false positives, setting up of control ligation mix with vector alone etc. RESULTS:We describe the development of a novel dual cloning/expression vector, which enables to screen the recombinants directly and expression of the gene of interest. The vector contains Green fluorescence protein (GFP) as the reporter gene and is constructed in such a way that the E. coli cells upon transformation with this vector does not show any fluorescence, but readily fluoresce upon insertion of a foreign gene of interest. The same construct could be easily used for screening of the clones and expression studies by mere switching to specific hosts. CONCLUSIONS:This is the first vector reported that takes the property of colour or fluorescence to be achieved only upon cloning while all the other vectors available commercially show loss of colour or loss of fluorescence upon cloning. As the fluorescence of GFP depends on the solubility of the protein, the intensity of the fluorescence would also indicate the extent of solubility of the expressed target protein.

journal_name

Microb Cell Fact

journal_title

Microbial cell factories

authors

Banerjee S,Kumar J,Apte-Deshpande A,Padmanabhan S

doi

10.1186/1475-2859-9-30

subject

Has Abstract

pub_date

2010-05-11 00:00:00

pages

30

issn

1475-2859

pii

1475-2859-9-30

journal_volume

9

pub_type

杂志文章

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