[vc_row][vc_column width=”1/2″][vc_single_image image=”7836″ img_size=”360*260″][/vc_column][vc_column width=”1/2″][vc_single_image image=”8094″ img_size=”large” el_class=”protein-services-right-image”][/vc_column][/vc_row][vc_row css=”.vc_custom_1530503603170{margin-top: 30px !important;}”][vc_column][vc_column_text]Protein production using recombinant technologies continues to revolutionize all aspects of life and life sciences. Essentially, a gene encoding a protein of interest is expressed to make the protein at dramatically enhanced yield and or with greatly improved characteristics in the native organism or in heterologous hosts. Recombinant production of proteins involves transforming cells with a desired gene in a DNA vector. The gene then translates into its corresponding protein. The expressed protein can then be extracted by lysing the cells and subsequent purification steps. In some cases, the protein made in the cells is exported into the culture medium through protein secretion machineries.
Bacterial, yeast, insect and mammalian expression systems are widely used. Each system has its own advantages and disadvantages. Selection of a particular expression system for a given protein should be based on many factors, such as the type, origin and function of the protein, technical challenges, applications, and regulatory considerations. Bio-Technical Resources offers several microbial expression systems, typically much more productive and affordable than insect and mammalian systems.[/vc_column_text][vc_column_text]A brief introduction to these expression systems is provided in a downloadable PowerPoint presentation BTR multiple host systems for protein expression (pdf). In addition to these platform organisms, BTR has experience working with numerous other microorganisms such as Lactobacillus lactis, Bacillus licheniformis, Hansenula polymorpha, and Myceliophthora thermophile C1 (previously known as Chrysosporium lucknowense C1).
BTR was previously a North American representative for two proprietary protein expression systems, Hansenula polymorpha (property of ARTES Biotechnology GmbH) and Bacillus licheniformis (property of Koninklijke DSM N.V ), but no longer represents these proprietary systems. BTR will work with our clients’ specific microbial strains producing products that are categorized as BSL1.[/vc_column_text][vc_column_text]No single host system is the best option for all types of proteins and applications. BTR has the capacity and proven experience to help you to choose and develop the most efficient production system for your protein of interest (POI).
Five non-proprietary protein expression systems are available at BTR. Please visit the respective webpages linked to the individual buttons below:[/vc_column_text][/vc_column][/vc_row][vc_row css=”.vc_custom_1533894571830{border-top-width: 5px !important;border-right-width: 5px !important;border-bottom-width: 5px !important;border-left-width: 5px !important;padding-top: 20px !important;padding-right: 20px !important;padding-bottom: 20px !important;padding-left: 20px !important;border-left-color: #f6faff !important;border-left-style: solid !important;border-right-color: #f6faff !important;border-right-style: solid !important;border-top-color: #f6faff !important;border-top-style: solid !important;border-bottom-color: #f6faff !important;border-bottom-style: solid !important;}”][vc_column][/vc_column][/vc_row][vc_row css=”.vc_custom_1530503603170{margin-top: 30px !important;}”][vc_column][vc_column_text]The microbial expression hosts offered by BTR have the potential to produce your intracellular or secreted protein of interest. Each system has strengths and weaknesses.
BTR will help you select one microbial host, via a phased Development Program, to serve as a protein expression platform to meet your present and future needs:[/vc_column_text][/vc_column][/vc_row][vc_row css=”.vc_custom_1533894571830{border-top-width: 5px !important;border-right-width: 5px !important;border-bottom-width: 5px !important;border-left-width: 5px !important;padding-top: 20px !important;padding-right: 20px !important;padding-bottom: 20px !important;padding-left: 20px !important;border-left-color: #f6faff !important;border-left-style: solid !important;border-right-color: #f6faff !important;border-right-style: solid !important;border-top-color: #f6faff !important;border-top-style: solid !important;border-bottom-color: #f6faff !important;border-bottom-style: solid !important;}”][vc_column][vc_column_text]Several projects of R&D services in this area are highlighted in PowerPoint slideshow Protein expression examples (pdf).[/vc_column_text][/vc_column][/vc_row][vc_row ts_responsive_css=”14334039|colbreak_no|50||||||||colbreak_no|||||||||colbreak_no||||||||||colbreak_no|||||||||”][vc_column][vc_tta_accordion][vc_tta_section title=”What types of protein expression systems does Bio-Technical Resources offer?” tab_id=”1597941617696-a118c72a-7dff”][vc_column_text]We offer five different expression systems, including two bacterial hosts (Escherichia coli and Bacillus subtilis), two yeast hosts, (Saccharomyces cerevisiae and Pichia pastoris) and a filamentous fungus (Trichoderma reesei). Target protein are expressed as intracellular proteins or secreted into the culture medium. We also work with other systems of Clients’ choice. [/vc_column_text][/vc_tta_section][vc_tta_section title=”When should I use the E. coli expression system?” tab_id=”1597941767788-e6625a7e-c87b”][vc_column_text]E. coli system is by far the most cost-effective and consistent production method. We have performed numerous Services Programs to develop E. coli strains and processes, and scale up production from milligrams to grams of protein. If not already tested for a given protein, E. coli should always be the first system to evaluate. Many proteins produced in E. coli do show activity of the native protein although E. coli do not incorporate post-translational modifications into the recombinant protein. Protein produced in E. coli may not be suitable for some applications du to endotoxin and regulatory reasons.[/vc_column_text][/vc_tta_section][vc_tta_section title=”What people should consider in choosing an expression system?” tab_id=”1597941874882-661d8c5e-1f1e”][vc_column_text]The main factors to consider are the native host of your protein, what you know about your protein, and intended applications. Typically, proteins of bacterial origin have a good chance to be expressed as functional protein in E. coli and B. subtilis. Proteins from eukaryotes may or may not be expressed as functional protein in E. coli. Yeast and filamentous fungus might be more appropriate. Production of protein in a secreted form is desirable for lower cost of downstream processing (product recovery).[/vc_column_text][/vc_tta_section][vc_tta_section title=”What is the major advantage of using Trichoderma as an expression host?” tab_id=”1597941908435-ba0925a3-c9f4″][vc_column_text]T. ressei is a mesophilic filamentous fungus that synthesizes and secretes cellulase. Its hypersecreting mutant RUT-C30 has become one of the most widely used strains of filamentous fungi for the production of cellulase and recombinant protein. Cellulase production reached over 100 g per liter in high cell density fermentation at commercial scale. T. reesei grows in simple and cheap medium. Efficient secretion of target protein into the medium provides an opportunity for low-cost downstream processing.[/vc_column_text][/vc_tta_section][vc_tta_section title=”Where to start to know if Bio-Technical Resources (BTR) could help us with protein expression?” tab_id=”1597941970546-c8e694bd-5e46″][vc_column_text]Just leave a message and your contact in the contact form on our web site. BTR’s Business Development team will get in touch with you to schedule a brief technical call. If there is a good alignment between your need and BTR’s capability, an NDA will be signed to protect your confidential information before more in-depth technical discussions. A Services Program proposal will be prepared and discussed with you.[/vc_column_text][/vc_tta_section][vc_tta_section title=”Do clients have to pay a license fee for using Bio-Technical Resources’ expression systems?” tab_id=”1597942007076-e98a5ab0-d653″][vc_column_text]No. The only exception is when the client desires to have a Services Program done at BTR using a third-party system or materials that require licensing. In that case，the client will be responsible for licensing from the third party[/vc_column_text][/vc_tta_section][vc_tta_section title=”What are the scales of fermentation at BTR?” tab_id=”1597942048713-b61cffba-069c”][vc_column_text]BTR operates fermentors of four different sizes: 1-, 14-, 60- and 250-Liters. Process development and optimization utilize primarily 1-L fermentors （operated in sets of up to 8 fermentors). Scale-up are tested at the 14-L scale. Final scale-up and production are in either 60- or 250-L fermentors.[/vc_column_text][/vc_tta_section][vc_tta_section title=”Is Bio-Technical Resources (BTR) a GMP facility?” tab_id=”1597942083449-978bae33-9082″][vc_column_text]No. BTR is a R&D facility. However, BTR has developed numerous production processes that have been transferred and scaled up for commercial production at GMP facilities.[/vc_column_text][/vc_tta_section][vc_tta_section title=”How about Intellectual Property?” tab_id=”1597942117429-11f111b1-23a0″][vc_column_text]Bio-Technical Resources provides R&D services for a Fee. All technologies developed during a Service Program entirely belong to the Client. BTR will also assist client in preparations for patent application if requested.[/vc_column_text][/vc_tta_section][vc_tta_section title=”How to protect our sensitive proprietary information?” tab_id=”1597942137585-ebbc8069-171c”][vc_column_text]The intellectual property and/or trade secrets of new and existing technologies are invaluable to the success of our clients. BTR adheres stringently to Non-Disclosure Agreements that BTR enters with its clients.[/vc_column_text][/vc_tta_section][vc_tta_section title=”Do you have examples of R&D Services Programs?” tab_id=”1597942160348-221424a2-27ca”][vc_column_text]Yes. Please visit our web page of Resources – Technical, where you will find several R&D Project examples and showcases. Note that the vast majority of R&D programs performed by BTR have been confidential/proprietary efforts for clients; most of these cannot be shared with any third parties. The examples on the website are either BTR’s internal R&D programs or clients’ programs for which BTR has been given permission to publicize or only non-confidential general information is disclosed.[/vc_column_text][/vc_tta_section][/vc_tta_accordion][/vc_column][/vc_row]