We’ve said it enough times; the plaque-assay is the ‘gold standard’ for determining virus infectivity. But this doesn’t make the procedure any easier! Whether it’s the agonising 5 day waiting period or the disorientating number of steps, plaque-assays can seem like a chore and we’ve heard of more than enough non-virologists admit to skipping this laborious technique in favour of a simpler solution. (more…)
In our previous blog we talked about the early stages of growing insect cells when you might just have revived a frozen stock and set up either monolayer or suspension cultures (or both). If you have established a viable suspension culture – and here we are talking primarily about insect cells such as Sf21 or Sf9 – you will probably monitor them fairly closely for their rate of growth. The ideal scenario is that your cells will double in number every 24 hours. However, frequently this isn’t the case. Why not? (more…)
A frequent customer query concerns baculovirus transfer vector plasmid compatibility with either flashBACTM or other systems for making recombinant viruses. Obviously, if you are buying flashBACTM and our pOET range of transfer vectors you won’t have a problem. However, given that baculovirus expression vectors have been around since 1983 and many labs have produced variations around a theme, it is not surprising that confusion can arise. (more…)
While OET is currently unable to offer GMP manufacture of recombinant proteins or viruses, we can offer a premium service for pre-GMP manufacture. This can serve as a very useful bridge to full GMP projects conducted by other service providers. So what is the advantage of a pre-GMP step? (more…)
A question that comes up from time to time is the use of co-infection with baculovirus vectors for multiple protein expression in insect cells. The need arises if you have produced a number of baculovirus vectors that each synthesise a component of a multi-subunit complex, such as an enzyme or a virus like particle. Intuitively, you know that it is probably necessary to add many virus particles per cell to achieve efficient infection with each recombinant. But how many viruses can you add to each cell and still get each one into every cell in equal numbers? (more…)
A question we are asked from time to time is to identify baculovirus transfer vectors
compatible with our flashBAC™ system. We obviously nominate our own extensive range that is available but frequently someone has an old plasmid from years ago that they want to reuse. (more…)
Variable expression of multi-component protein complexes is increasingly necessary as more sophisticated projects are attempted. But how can this be achieved? Most of our expression work is based on the baculovirus system, in particular our flashBAC™ vectors that permit easy recombinant virus generation in a one-step process. These insect-specific viruses offer an ideal platform for producing a wide range of recombinant proteins including nuclear, cytoplasmic, membrane-bound and secreted examples. (more…)
Between initial tests and larger scale up you may want to conduct intermediate scale recombinant protein production using baculovirus vectors. If you are working with several constructs then this can begin to get expensive of cell culture vessels such as the ubiquitous 125ml conical flasks, in which you can amplify 25-30mls of virus-infected cells. Space on shakers can also be at a premium in some labs. (more…)
Oxford Expression Technologies are the experts when it comes to the science of baculovirus. For almost 10 years now we have specialised in recombinant protein production in insect cells and the ‘Bac to the Future’ blog is the culmination of this extensive knowledge.
Written by our in-house scientists, articles cover every aspect of the baculovirus system – from its discovery and background, to practical applications in research and industry. We cover both the day-to-day challenges and more complex cases faced by ourselves and customers. You can also keep up to date on all the news, developments and promotional offers from the company.
If you have a question about any of the content featured, or simply want more information on a particular topic, then do not hesitate to get in touch with us directly at firstname.lastname@example.org. In addition, OET offers everything needed to aid your own insect virus research. As creators of the world renowned flashBACTM technology, our range of baculovirus expression vectors are designed for simple and rapid recombinant protein production. This is supported by an optimised range of transfer plasmids, transfection reagents, and cell culture media to ensure a powerful and versatile system. Browse the full collection of products at https://oetltd.com/shop/
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A question that often comes up from clients is what is the best signal peptide to use for baculovirus-expressed secreted recombinant proteins? While we have discussed the best flashBAC™ variant to use for the production of secreted proteins in a previous blog, we have never considered the role of the signal peptide. (more…)