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. 1987 Apr;169(4):1678–1683. doi: 10.1128/jb.169.4.1678-1683.1987

Cloning and expression of a type 1 fimbrial subunit of Actinomyces viscosus T14V.

M K Yeung, B M Chassy, J O Cisar
PMCID: PMC211999  PMID: 2881922

Abstract

The type 1 fimbriae of Actinomyces viscosus mediate the adherence of this organism to saliva-treated hydroxyapatite. The gene encoding a putative subunit of this fimbrial adhesin was cloned in Escherichia coli, and its product was examined. A. viscosus T14V chromosomal DNA was partially restricted with Sau3AI and cloned into E. coli JM109 by using the plasmid vector pUC13. Two clones, each containing a different DNA insert with a common 4.1-kilobase region, reacted in colony immunoassays with specific polyclonal as well as monoclonal antibodies directed against A. viscosus T14V type 1 fimbriae. Western blot analysis revealed the expression of a 65-kilodalton protein that migrated slightly behind an antigenically similar protein from native type 1 fimbriae. Deletion analysis showed that the gene encoding the cloned protein was localized on a 1.9-kilobase PstI-BamHI fragment and that transcription was dependent on the lac promoter of the vector. The cloned fimbrial protein was purified from the E. coli cytoplasmic fraction by ion-exchange, immunoaffinity, and gel permeation chromatography. Rabbit antibodies prepared against the cloned protein and against purified A. viscosus type 1 fimbriae gave similar patterns with partially dissociated type 1 fimbriae after sodium dodecyl sulfate-polyacrylamide gel electrophoresis and immunoblotting. The data therefore provide evidence that the gene cloned encodes a subunit of this fimbrial adhesin.

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