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. 1987 Aug;169(8):3785–3791. doi: 10.1128/jb.169.8.3785-3791.1987

Translocation of Vibrio harveyi N,N'-diacetylchitobiase to the outer membrane of Escherichia coli.

M Jannatipour, R W Soto-Gil, L C Childers, J W Zyskind
PMCID: PMC212467  PMID: 3301816

Abstract

The gene encoding N,N'-diacetylchitobiase (chitobiase) of the chitinolytic marine bacterium Vibrio harveyi has been isolated. While expression of the chitobiase gene (chb) was inducible by N,N'-diacetylchitobiose in V. harveyi, it was expressed constitutively when cloned in Escherichia coli, suggesting that controlling elements are not closely linked to chb. Chitobiase was found in the membrane fraction of E. coli cells containing plasmids with the cloned V. harveyi chb gene. When membranes of such cells were separated on Osborn gradients, chitobiase activity was found mainly in the outer membrane band. Translocation of the enzyme to the outer membrane was accompanied by cleavage of a signal peptide. A fusion protein, in which 22 amino acids from the amino terminus of prechitobiase were replaced with 21 amino acids from the pUC19 lacZ amino terminus, was not processed, and 99% of the activity was located in the cytoplasmic fraction. A homology to six amino acids surrounding the lipoprotein processing and modification site was found near the amino terminus of prechitobiase.

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Selected References

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