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Microbiol Immunol. 1997;41(6):461-7.

Overproduction of Campylobacter ferritin in Escherichia coli and induction of paracrystalline inclusion by ferrous compound.

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Department of Bacteriology, Faculty of Medicine, Kyushu University, Fukuoka, Japan.


The ferritin gene (cft) of Campylobacter jejuni was overexpressed in cells of Escherichia coli using a T7 RNA polymerase expression system. Many round particles which were the same size as the ferritin particles purified from C. jejuni were observed in the lysate of the cft-overexpressed E. coli cells. Since most of them were devoid of a central electron dense core consisting of ferric irons, the Campylobacter ferritins over-produced in E. coli seemed to be apoferritin. When large amounts of ferrous iron (supplied as FeSO4) were added to culture medium, the cft-overexpressed cells formed large inclusion bodies of paracrystalline arrays comprised of ferritin particles with central electron dense cores. The addition of ferric irons did not produce paracrystalline inclusion.

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