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Construct design, production, and characterization of Plasmodium falciparum 48/45 R0.6C subunit protein produced in Lactococcus lactis as candidate vaccine

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  1. Lactococcus lactis provides an efficient platform for production of disulfide-rich recombinant proteins from Plasmodium falciparum

    Research output: Contribution to journalJournal articleResearchpeer-review

  2. Display of wasp venom allergens on the cell surface of Saccharomyces cerevisiae

    Research output: Contribution to journalJournal articleResearchpeer-review

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BACKGROUND: The sexual stages of Plasmodium falciparum are responsible for the spread of the parasite in malaria endemic areas. The cysteine-rich Pfs48/45 protein, exposed on the surface of sexual stages, is one of the most advanced antigens for inclusion into a vaccine that will block transmission. However, clinical Pfs48/45 sub-unit vaccine development has been hampered by the inability to produce high yields of recombinant protein as the native structure is required for the induction of functional transmission-blocking (TB) antibodies. We have investigated a downstream purification process of a sub-unit (R0.6C) fragment representing the C-terminal 6-Cys domain of Pfs48/45 (6C) genetically fused to the R0 region (R0) of asexual stage Glutamate Rich Protein expressed in Lactococcus lactis.

RESULTS: A series of R0.6C fusion proteins containing features, which aim to increase expression levels or to facilitate protein purification, were evaluated at small scale. None of these modifications affected the overall yield of recombinant protein. Consequently, R0.6C with a C-terminal his tag was used for upstream and downstream process development. A simple work-flow was developed consisting of batch fermentation followed by two purification steps. As such, the recombinant protein was purified to homogeneity. The composition of the final product was verified by HPLC, mass spectrometry, SDS-PAGE and Western blotting with conformation dependent antibodies against Pfs48/45. The recombinant protein induced high levels of functional TB antibodies in rats.

CONCLUSIONS: The established production and purification process of the R0.6C fusion protein provide a strong basis for further clinical development of this candidate transmission blocking malaria vaccine.

Original languageEnglish
JournalMicrobial Cell Factories
Volume16
Issue number1
Pages (from-to)e97
ISSN1475-2859
DOIs
Publication statusPublished - 31 May 2017

    Research areas

  • Animals, Bacterial Vaccines, Bioreactors, Immunogenicity, Vaccine, Lactococcus lactis, Plasmodium falciparum, Protein Subunits, Rats, Recombinant Fusion Proteins, Journal Article

ID: 52821541