objective: acinetobacter baumannii (a. baumannii) is a major hospital pathogen with a high capacity to resist most common anti-microbial agents. a. baumannii is the etiologic agent for various illnesses including pneumonia, meningitis, and bloodstream infections. biofilm associated proteins (bap) are specific cell surface proteins essential for the formation of biofilm and play a main role in i...

Recombinant proteins play an important role in many areas of our lives. For example, recombinant enzymes are used the food and chemical industries as high-quality for research, diagnostic therapeutic applications. The production is still dominated by expression systems based on microbes mammalian cells, although manufacturing plants – known molecular farming has been promoted alternative, cost-...

background pe5 is a member of the pe protein family whose precise function is yet to be understood. there are about 100 members of the pe family proteins in mycobacterium tuberculosis. these glycine- and alanine-rich proteins consist of proline-glutamate motifs at their n-termini and may be implicated in pathogenesis of the bacilli. objectives we aimed to clone and over-express the rv0285 codin...

Protein purification is not a simple task. Yet, overexpression at bacterial systems with recombinant modifications brings further difficulties. Adding tag, an affinity label, and expressing particular domains of the whole protein, especially hydrophobic sections, make challenging process. folding pattern may perturb N- or C-terminal tag this terminal preference lead to poor yield. Codon optimiz...

epitope tagging is a method of expressing proteins whereby an epitope for a specific monoclonal antibody is fused to a target protein using recombinant dna techniques. the aim of this study was to sub-clone the peroxisomal protein (pep) cdna into a mammalian expression vector leading to the formation of a  chimeric pep-cdna containing the flag epitope. the flag-pep recombinant cdna was construc...

Background: Degradation of phytic acid to inorganic phosphate in domestic animals’ diets requires thermostable phytase. Although Basillus subtilis phytase shows a potential to be degraded phytate complex in high temperature, the enzyme activities and yields need to be increased to make them possible for industrial application. Methods: The phytase gene from Bacillus subtilis DR8886 was...

Chicken infectious bronchitis virus (IBV) causes severe respiratory and renal dysfunction in chickens. In the present study, we used reverse transcription-polymerase chain reaction (RT-PCR) to amplify the nucleocapsid (N) protein gene of strain Massachusetts (Mass) H120 of IBV that is commonly used in the vaccine production in Iran. The PCR product with the expected size of 1.2 kb was cloned in...

background: the rh antigens are expressed as parts of a protein complex in the rbc membrane. this complex is a tetramer, consisting of two molecules of rhag and two molecules of rh proteins. to express rhd in rbc membrane, expression of rhag is essential. this co-expression only occurs in the erythroid lineage. k562 cell line has an erythroid lineage. materials and methods: cord blood was used ...

background: we have previously reported that a 31 kda protein was screened from the excretory-secretory (es) proteins of tichinella spiralis muscle larvae (ml) by immunoproteomics using early infection sera, and the gene encoding a 31 kda protein from t. spiralis was cloned and expressed in an e. coli expression system. in this study, the recombinant 31 kda antigens were used for detection of a...