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. 1988 Sep;170(9):3803–3809. doi: 10.1128/jb.170.9.3803-3809.1988

Cloning and nucleotide sequence of a gene for Actinomyces naeslundii WVU45 type 2 fimbriae.

M K Yeung 1, J O Cisar 1
PMCID: PMC211374  PMID: 2900829

Abstract

A genomic library of Actinomyces naeslundii WVU45 DNA in Escherichia coli was screened for antigen expression with rabbit antibody against A. naeslundii fimbriae. Western blotting (immunoblotting) of one recombinant clone carrying a 13.8-kilobase-pair insert revealed a 59-kilodalton (kDa) immunoreactive protein. A protein of similar electrophoretic mobility was detected from the isolated fimbrial antigen. Expression of the 59-kDa cloned protein in E. coli was directed by a promoter from the insert. The DNA sequence of the subunit gene was determined, and an open reading frame of 1,605 nucleotides was identified which was preceded by a putative ribosome-binding site and followed by two inverted repeats of 14 and 17 nucleotides, respectively. The reading frame encoded a protein of 534 amino acids (calculated molecular weight, 57,074), and the N-terminal sequence resembled that of a signal peptide. The presence of a 32-amino-acid signal peptide was indicated by amino-terminal sequencing of the fimbriae from A. naeslundii. The sequence, as determined by Edman degradation, was identical to that deduced from the DNA sequence beginning at predicted residue 33 of the latter sequence. Moreover, the amino acid composition of the predicted mature protein was similar to that of the isolated fimbriae from A. naeslundii. Thus, the cloned gene encodes a subunit of A. naeslundii fimbriae.

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Selected References

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