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Journal of Bacteriology logoLink to Journal of Bacteriology
. 1991 Sep;173(17):5523–5531. doi: 10.1128/jb.173.17.5523-5531.1991

A gene for a new lipoprotein in the dapA-purC interval of the Escherichia coli chromosome.

J Bouvier 1, A P Pugsley 1, P Stragier 1
PMCID: PMC208266  PMID: 1885529

Abstract

Cloning and sequence analysis of the region located downstream of the dapA gene of Escherichia coli has revealed the presence of an open reading frame that is cotranscribed with dapA. This gene codes for a 344-amino-acid polypeptide with a potential signal sequence characteristic of a lipoprotein. When this gene, called nlpB, is expressed from a multicopy plasmid in bacteria grown in the presence of [3H]palmitate, a labeled 37-kDa protein is produced. A slightly larger precursor molecule is detected when minicells expressing nlpB are treated with globomycin, a specific inhibitor of lipoprotein signal peptidase. Therefore, the nlpB gene encodes a new lipoprotein, designated NlpB. This lipoprotein is detected in outer membrane vesicles prepared from osmotically lysed spheroplasts and appears to be nonessential, since a strain in which the nlpB gene is disrupted by insertion of a chloramphenicol resistance gene is still able to grow and shows no discernible NlpB phenotype. The putative transcription termination signals of the dapA-nlpB operon overlap the promoter of the adjacent purC gene.

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Selected References

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