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Applied Microbiology and Biotechnology

, Volume 75, Issue 3, pp 599–607 | Cite as

The development of a flagellin surface display expression system in a moderate thermophile, Bacillus halodurans Alk36

  • Michael Crampton
  • Eldie Berger
  • Sharon Reid
  • Maureen Louw
Applied Genetics and Molecular Biotechnology

Abstract

This study relates to the development of an alkaliphilic, thermotolerant, Gram-positive isolate, Bacillus halodurans Alk36, for the over-production and surface display of chimeric gene products. This bacterium continuously over-produces flagellin. To harness this ability, key genetic tools, such as gene targeted inactivation, were developed for this strain. The hag gene, which codes for flagellin, was inactivated on the chromosome giving rise to the B. halodurans BhFC01 mutant. Polylinkers were inserted as in-frame, chimeric, flagellin sandwich fusions to identify the permissive insertion sites corresponding to the variable regions of the flagellin protein. Flagellin expression and motility were evaluated for these constructs. Two sites were identified for possible peptide insertion in the flagellin gene, one of which produced functional flagella and was able to restore the motility phenotype to a non-motile mutant. Peptides encoding a poly-histidine peptide and the HIV-1 subtype C gp120 epitope were, respectively, incorporated into this site as in-frame fusions. The peptides were found to be successfully displayed on the cell surface and functional through metal binding and immunological studies, respectively.

Keywords

Flagellin Cell surface display Bacillus halodurans Fusion protein Integration 

Notes

Acknowledgment

We would like to thank Dr Gerhard Pietersen (Plant Protection Institute, ARC, Pretoria, South Africa) for preparation of the anti-flagellin antibodies. We would also like to thank Dr D. Meyer for kindly supplying the MEIV3b 4 antibodies.

This research was supported through funding from a CSIR Thematic grant PPTH/2004/002.

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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  • Michael Crampton
    • 1
  • Eldie Berger
    • 1
  • Sharon Reid
    • 2
  • Maureen Louw
    • 1
  1. 1.CSIR BiosciencesPretoriaSouth Africa
  2. 2.Department of Molecular and Cell BiologyUniversity of Cape TownCape TownSouth Africa

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