Academic Journal
Cloning and expression of the leukotoxin gene from Actinobacillus actinomycetemcomitans
| العنوان: | Cloning and expression of the leukotoxin gene from Actinobacillus actinomycetemcomitans |
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| المؤلفون: | Kolodrubetz, D, Dailey, T, Ebersole, J, Kraig, E |
| المصدر: | Infection and Immunity ; volume 57, issue 5, page 1465-1469 ; ISSN 0019-9567 1098-5522 |
| بيانات النشر: | American Society for Microbiology |
| سنة النشر: | 1989 |
| الوصف: | The leukotoxin produced by Actinobacillus actinomycetemcomitans has been implicated in the etiology of juvenile periodontitis. To initiate a genetic analysis of the role of this protein in disease, we have cloned the leukotoxin gene in Escherichia coli. Recombinant colonies carrying toxin gene sequences were isolated by screening a genomic A. actinomycetemcomitans library with a DNA probe for the leukotoxin gene from a related bacterium, Pasteurella haemolytica. To demonstrate that the cloned A. actinomycetemcomitans DNA contained a functional leukotoxin gene, protein extracts of E. coli containing the A. actinomycetemcomitans clone were tested directly for leukotoxic activity against human cell lines in chromium release assays. A construct containing the entire cloned region produced a functional toxin. No cytotoxicity was seen when extracts from cells containing plasmids with deletions in the putative coding region were used. Furthermore, the toxin produced by the cloned gene has the same target cell specificity as the leukotoxin extracted directly from A. actinomycetemcomitans. These results indicate that sequences encoding a functional leukotoxin have been cloned and are expressed in E. coli. Southern blot analysis of DNA from leukotoxin-producing (Lkt+) and non-leukotoxin-producing (Lkt-) strains indicated that the Lkt- strain also contained a copy of the gene. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| DOI: | 10.1128/iai.57.5.1465-1469.1989 |
| الاتاحة: | http://dx.doi.org/10.1128/iai.57.5.1465-1469.1989 https://journals.asm.org/doi/pdf/10.1128/iai.57.5.1465-1469.1989 |
| Rights: | https://journals.asm.org/non-commercial-tdm-license |
| رقم الانضمام: | edsbas.89FA44CC |
| قاعدة البيانات: | BASE |
| DOI: | 10.1128/iai.57.5.1465-1469.1989 |
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