objective: escherichia coli (e.coli) o157:h7 is one of the most important pathogenic causes of hemorrhagic colitis in humans. cattle are the main reservoirs of this bacteria and vaccination is a key mechanism for its control. the intimin, translocated intimin receptor (tir), and espa proteins are virulence factors expressed by the lee locus of enterohemorrhagic e. coli. espa protein is a member...

alkaline phosphatase is an enzyme with widespread use in research and industry such as protein labeling, dephosphorylation of nucleic acids, and enzyme based biosensors. in the present study, alkaline phosphatase gene was inserted into the pet15b vector. the recombinant dna was then expressed using iptg as an inducer. the expression of this enzyme was optimized by changing expression conditions...

expression of eukaryotic proteins in e. coli often results in their aggregation. proper folding and solubility of therapeutical proteins are the pre-requisite for their bioactivity. this is not achieved in cytoplasmic expression in e. coli because of the absence of disulfide bonds formation. a novel expression/secretion vector was constructed which exploited β-lactamase signal sequence to trans...

objectives: in present study we aimed to clone the lux i gene encoding n-acyl-homoserine synthase detected in biofilm forming clinical isolates of acinetobacter baumannii and study its expression in escherichia coli transformants. materials and methods: four a. baumannii hospital strains which demonstrated strong biofilm activity were selected in this investigation. the presence of lux i gene w...

with the aim of the secretion of human granulocyte macrophage-colony stimulating factor (hgm-csf) in escherichia coli, hgm-csf cdna was fused in-frame next to the signal sequence of st toxin (st-i) of exteroxigenic e. coli, containing 53 or 19 amino acids of signal peptide. the fused stsig::hgm-csf coding fragments were inserted into a t7-based expression plasmid. the recombinant plasmids were ...

With the aim of the secretion of human granulocyte macrophage-colony stimulating factor (hGM-CSF) in Escherichia coli, hGM-CSF cDNA was fused in-frame next to the signal sequence of ST toxin (ST-I) of exteroxigenic E. coli, containing 53 or 19 amino acids of signal peptide. The fused STsig::hGM-CSF coding fragments were inserted into a T7-based expression plasmid. The recombinant plasmids were ...

conclusions: our data showed that the recombinant mature lysostaphin protein produced by pet32a vector in e. coli system was very efficient. results: pcr and sequencing results confirmed the successful cloning of the target gene into the vector. the expression of protein was induced by iptg and high concentration of the recombinant protein was obtained via the purification process by affinity-c...

background: escherichia coli (e. coli) is the most extensively used host for the production of recombinant proteins. however, most of the eukaryotic proteins are typically obtained as insoluble, misfolded inclusion bodies that need solubilization and refolding. reteplase as a highly disulfide-bonded recombinant protein is an example of difficult to express protein in e. coli. methods: in this s...

tissue plasminogen activator (tpa) is a serine protease, which is composed of five distinct structural domains with 17 disulfide bonds, representing a model of high-disulfide proteins in human body. one of the most important limitations for high yield heterologous protein production in escherichia coli (e. coli) is the expression of complex proteins with multiple disulfide bridges. in this stud...