Abstract

We used the minitransposon TnhlyAs [Gentschev, I., Maier, G., Kranig, A. and Goebel, W. (1996) Mol. Gen. Genet. 252, 266-274] for random insertion of the secretion signal (HlyAs) of Escherichia coli hemolysin (HlyA) into chromosomal genes. Four mini-TnhlyAs derivatives bearing the gltA (citrate synthase), deoC (2 deoxyribose-5 phosphate aldolase), tig (trigger factor) genes and an unknown ORF fused to hlyAs were identified and characterized. Our data suggest that TnhlyAs-generated hemolysin fusion proteins are secreted efficiently by the HlyB/HlyD/TolC hemolysin secretion machinery and that this can be useful for studies of gene expression or function.

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