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LifeSensors - Expression Systems

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Expression Systems


Our SUMO-based Protein and Peptide Expression Systems maximize the yield of soluble, functional proteins in E.coli, yeast, insect and mammalian cells. This system utilizes unique features of SUMO functioning both as a chaperonin and as an initiator of protein folding to dramatically improve the solubility and increase the level of expression of the protein of interest. Our desumoylases efficiently and robustly remove the SUMO tag precisely at the junction of the C-terminus of SUMO and the N-terminus of the protein releasing it with desirable N-terminal amino acid (with the exception of proline). Both SUMO and the desumoylases have His6 tag making their subsequent removal fast and easy.


Which system is right for you?

 

  • For prokaryotic expression (E. coli) you can choose from any of our SUMO tags, SUMO-Pro, SUMOstar, or SUMO-Pro3.  SUMOstar and SUMO-Pro3 serve as entry points to future eukaryotic systems.
  • For expression in yeast (S. cerevesiae or P. pastoris) choose our yeast SUMOstar or SUMO-Pro3 systems.
  • For eukaryotic systems (insect mammalian cell) choose our SUMOstar system.
Each system is available in a convenient kit format containing all of the necessary reagents or as individual components.

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Expression Systems

E. Coli

Bacterial expression is the usual starting point for expression of heterologous proteins. Bacterial fermentations are inexpensive and can reach high cell densities resulting in high volumetric yields of the target protein. Our SUMO fusion technology is ideally suited for this system.
Expression Systems

Mammalian

Mammalian cell expression has become the system of choice for production of complex, glycosylated biotherapeutic proteins such as antibodies, growth factors and fertility hormones. Our SUMOstar system has been designed for transient transfection studies in HEK293 or CHO cells.
Expression Systems

Insect

Baculovirus/insect cell systems have found wide application for the expression of highly recalcitrant proteins such as protein tyrosine kinases. We have developed a SUMOstar-based system to support expression studies in this system.
Expression Systems

Yeast

As with bacterial expression systems, yeast offer relatively inexpensive growth media and high density fermentation. Furthermore, yeast offer the capability of carrying out limited post-translational modifications such as disulfide bond formation and glycosylation. We offer two yeast expression systems, one for intracellular expression in S. cerevisiae and the second for extracellular expression in P. pastoris.
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HEADLINES

LifeSensors News
 
LifeSensors Launches DiUbiquitin Substrate
A Novel Fluorescent Assay for Ubiquitin Isopeptide Bond Cleavage
MALVERN, PA -- June 29, 2010 --LifeSensors, Inc., a biotechnology company, announces the launch of its novel physiologically relevant diubiquitin substrates for measuring isopeptide bond cleavage (patent applied for). This breakthrough technology, for both basic research and drug discovery targeting the ubiquitin proteasome pathway, offers sensitive, rapid, and robust fluorescent readouts of isopeptidase or de-ubquitylase (DUB) activity.
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LifeSensors

LifeSensors' Gender Sorting Technology Discussed
Feb 9th 2010 | From The Economist online
Dr Butt’s new device is an oestrogen sniffer. It relies on the fact that female embryos produce this hormone in quantity and male ones do not. The sensor uses a fine needle to penetrate both the shell and the allantoic sac of an egg. This sac is a fluid-filled membrane that cushions the embryo and helps it trade carbon dioxide for oxygen from the air. (It is also the membrane that can make peeling a hard-boiled egg such a frustrating affair.)
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LifeSensors

LifeSensors Publishes in Journal of Animal Science
2010 Jan 15.
An estrogen sensor for poultry gender sorting.

Tran HT, Ferrell W, Butt TR.

The need for segregation of poultry based on sex is driven by gender-related differences in growth rate, market age, management practices, and nutritional requirements. Each day, global poultry industry staff would ideally like to determine the gender of >150 million newly hatched birds. Currently, this can be done only manually at the hatchery, which is a virtually impossible undertaking. LifeSensors has developed a facile, rapid, and low cost yeast-based assay that distinguishes male from female embryonated eggs before hatching based on the estrogen level of their allantoic fluid.
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