Increasing available choices for conjugate vaccine technology by producing carrier proteins in Scarab Genomics' reduced genome E coli strains

Scarab Genomics goal is to commercialize carrier proteins for conjugate vaccine manufacture This proposal focuses on two bacterial carrier proteins that have been approved by the FDA and that are in use in pre clinical and clinical studies Exoprotein A EPA from Pseudomonas aeruginosa and Protein D PD from non typeable Haemophilus influenzae These proteins are difficult to make by the conventional E coli fermentation processes and are in very short and unreliable supply commercially EPA or presently unavailable PD Scarab s Clean Genome E coli fermentation technology has not only enabled continuous flow fermentation for at least days to become reality but has proved to be very efficient at producing the carriers we have tested with reliable production and good yields Scarab strains provide much greater safety and productivity than conventional bacterial fermentation strains Conjugate vaccines have been enormously successful in preventing pneumococcal and meningococcal diseases both in the developed and the developing world Pfizer s pneumococcal vaccine Prevnar made USD billion last year There is still a huge unmet demand for pneumococcal vaccines in many parts of the world estimated by the vaccine alliance Gavi as two billion doses over the next decade Although the carrier protein CRM is used in many pneumococcal vaccines problems such as carrier induced epitope suppression CIES contributed to the decision by GlaxoSmithKline to use PD as a carrier for of the pneumococcal serotypes targeted in Synflorix $ million in sales in Interest in conjugate vaccine research is expanding to other infectious diseases such as HIV and malaria and also chronic conditions and addictions The need for multiple carrier proteins is driven by i CIES a reduction in immunogenicity of vaccines that use the same carrier protein particularly relevant as the desire to combine vaccines and improve coverage increases ii the need to explore multiple carrier proteins when developing conjugate vaccines against specific antigens iii the emergence of rare serotypes that require new vaccination with a different carriers This field of study is clearly relevant to the NIH mission both for research and the commercial availability of carriers for preclinical and clinical studies as well as the production of approved vaccines The Phase I specific aims of this Fast Track proposal will demonstrate that EPA and PD express well in Scarab s Clean Genome strains and that they can be produced in a continuous flow process This will establish feasibility of commercialization New Scarab technologies will be tested that i avoid use of antibiotics in the fermentation process and ii enable cleaner and more efficient recovery of the product In Phase II for each carrier the fermentation system will be fully optimized and a downstream process devised including purification procedure thorough analysis of the product and preparation for sale as research grade reagents Scarab Genomics Clean Genome E coli expression system can make high quality vaccine carrier proteins inexpensively Carrier proteins are a component of conjugate vaccines that protect individuals from bacterial infections and that are being developed for other purposes including nicotine addiction and the spread of malaria Since many vaccines in development are conjugate vaccines providing high quality inexpensive carrier proteins will encourage vaccine research and promote the creation of new vaccines