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J Bacteriol, May 1998, p. 2701-2710, Vol. 180, No. 10
0021-9193/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Isolation and Characterization of Three Streptococcus pneumoniae Transformation-Specific Loci by Use of a lacZ Reporter Insertion Vector

Ekaterina V. Pestova* and Donald A. Morrison

Laboratory for Molecular Biology, Department of Biological Sciences, University of Illinois at Chicago, Chicago, Illinois

Received 26 November 1997/Accepted 9 March 1998

Although more than a dozen new proteins are produced when Streptococcus pneumoniae cells become competent for genetic transformation, only a few of the corresponding genes have been identified to date. To find genes responsible for the production of competence-specific proteins, a random lacZ transcriptional fusion library was constructed in S. pneumoniae by using the insertional lacZ reporter vector pEVP3. Screening the library for clones with competence-specific beta -galactosidase (beta -Gal) production yielded three insertion mutants with induced beta -Gal levels of about 4, 10, and 40 Miller units. In all three clones, activation of the lacZ reporter correlated with competence and depended on competence-stimulating peptide. Chromosomal loci adjacent to the integrated vector were subcloned from the insertion mutants, and their nucleotide sequences were determined. Genes at two of the loci exhibited strong similarity to parts of Bacillus subtilis com operons. One locus contained open reading frames (ORFs) homologous to the comEA and comEC genes in B. subtilis but lacked a comEB homolog. A second locus contained four ORFs with homology to the B. subtilis comG gene ORFs 1 to 4, but comG gene ORFs 5 to 7 were replaced in S. pneumoniae with an ORF encoding a protein homologous to transport ATP-binding proteins. Genes at all three loci were confirmed to be required for transformation by mutagenesis using pEVP3 for insertion duplications or an erm cassette for gene disruptions.

* Corresponding author. Present address: Department of Pathology, Northwestern University, Chicago, IL 60611. Phone: (312) 503-0951. Fax: (312) 503-8240. E-mail address: e-pestova{at}nwu.edu.

J Bacteriol, May 1998, p. 2701-2710, Vol. 180, No. 10
0021-9193/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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