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. 1992 Nov;60(11):4695–4703. doi: 10.1128/iai.60.11.4695-4703.1992

Isolation and nucleotide sequence of the gene (aniA) encoding the major anaerobically induced outer membrane protein of Neisseria gonorrhoeae.

G T Hoehn 1, V L Clark 1
PMCID: PMC258220  PMID: 1383156

Abstract

When grown under anaerobic conditions, Neisseria gonorrhoeae, the etiologic agent of the sexually transmitted disease gonorrhea, expresses several novel outer membrane proteins. One of these, Pan 1, has an apparent molecular mass of 54 kDa in electrophoresis and is recognized by serum samples from patients with gonococcal infection. The presence of antibodies to this protein in patient sera suggests that Pan 1 is expressed during gonococcal infection and, more importantly, that N. gonorrhoeae grows anaerobically in vivo. We have cloned the Pan 1 structural gene, aniA, by screening a gonococcal lambda gt11 expression library with monospecific, polyclonal anti-Pan 1 antiserum. Three distinct immunoreactive recombinants, containing overlapping fragments of DNA, were isolated and confirmed to be coding for Pan 1 protein sequences. Northern (RNA blot) hybridization of an insert from an aniA recombinant to total gonococcal cellular RNA revealed the presence of a 1.5-kb transcript that was specific to RNA from anaerobically grown gonococci, indicating that the aniA gene is regulated at the transcriptional level and is monocistronic. To characterize the aniA gene, we have sequenced the entire 2-kb region spanned by the overlapping recombinants. We have also performed primer extension analysis on RNA isolated from aerobically and anaerobically grown gonococci in order to define the aniA promoter region. Two putative primer extension products specific to organisms grown anaerobically were identified by homology to known Escherichia coli promoter sequences, suggesting that the regulation of aniA expression involves multiple promoter regions.

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Selected References

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