recombinant protein expression seminar paper
TRANSCRIPT
RECOMBINANT PROTEIN EXPRESSION
BYKARIUKI M. SAMUEL
ENOS KAMANI
INTRODUCTION
• RPE is a subcomponent of gene expression which involves translation of the gene into polypeptide chains and folding into proteins
• Used in esp. enzyme production, insulin, endonucleases, DNA pol, reverse T.
• Classified according to expression systems; bacterial, yeast, insect, mammalian.
INTRODUCTION CONT’
Bacterial expression
• Isolation of total or poly A tail RNA from cells or tissue
• First cDNA
Bacterial expression cont’
• Addition of oligonucleotide plugs
Bacterial expression cont’
• PCR amplification of cDNA
Bacterial expression cont’
• Directional ligation into appropriate vectorPeriplasmic export extracellular export
Bacterial expression cont’
• Amplification of the primary library into a bacteria of choice, E. coli, B. subtilis.
• Transformation done through heat shock, electroporation.
Heat shock transformation
Bacterial expression cont’
• Protein expression recovery sites in E. coli-cytoplasmic, periplasmic, medium
Bacteria expression cont’
• Harvesting done by • Chemical• Enzymatic e.g lysozymes• Biochemical e.g osmotic shock• Physical e.g. sonication• Mutant E. coli strains, L-forms
Bacterial expression cont’
• Advantages and disadvantages in the protein production into each compartment.
Bacterial expression cont’
• Purification-affinity chromatography• Quality control:• Acrylamide gel, • SDS-PAGE, • Western blot. 12
3 4
Yeast expression
• Same protocol as bacteria but the host is yeast cells where your protein is harvested
Expression in yeast cont’
• Genes synthesis• cDNA cloning in Yeast expression factor and
tagging• Transformation in yeast cells• Confirmation of pos. trans-formants by PCR• Affinity purification• SDS-PAGE/ western blot
Insect expression
Insect expression cont’
• Gene synthesis• cDNA cloning in baculovirus expression vector• Recombinant virus generation and
recombinant protein in bacmid• Transfection of insects cells with recombinant
bacmid• Generation of virus stock in insect cells• Quality control, SDS-PAGE/ western blot
Mammalian expression
Mammalian expression
• Gene synthesis• cDNA cloning into an expression factor• Transfection of cells with expression vector• Evaluation of expression by western blotting• Bio-reactor production• Harvesting• Affinity chromatography• Quality control, SDS-PAGE/ western blot
Expression in plants
Conclusion
References• Artes Biotechnology Langenfeld, Germany, http://
www.artes-biotechnology.com/expres/hansenula/hansenula01.jsp
• Dual SystemsBiotech, Schleren, Switzerland. http://www.dualsystems.com/products/protein-expression/expression-vectors-for-escherichia-coli.html
• Genscript, the biology GRO, Piscataway, USA. http://www.genscript.com/custom_protein_baculovirus_insect_expression.html
• Joan L. &J. Foster (2009) Microbiology, an evolving science. W.W. Norton, New York, USA 2nd ed.
• Park, S. J. and Lee, S. Y., "Efficient recovery of secretory recombinant protein from protease negative mutant Eshcherichia coli" Biotechnol. Techniques, 64(12):4897-4903 (1998)
• Tokyo Future Style Inc. http://www.tokyofuturestyle.com/english/products/preventec/preventec_t.php
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