Conjugal transfer and expression of streptococcal transposons in Clostridium acetobutylicum |
| |
Authors: | Joachim Bertram Peter Dürre |
| |
Institution: | (1) Institut für Mikrobiologie, Universität Göttingen, Grisebachstrasse 8, D-3400 Göttingen, Germany |
| |
Abstract: | The transposon-containing streptococcal plasmids pAM211, pCF10, and pINY1275 have been transferred at high frequency (10-2–10-3 per recipient, selecting for tetracycline resistance) to the Gram-positive anaerobe Clostridium acetobutylicum. Selection in the presence of two antibiotics (tetracycline and erythromycin) with the plasmids pAM 180 and pINY1275 yielded only low numbers of transconjugants (10-8 per recipient). Matings were done by combining liquid and filter mating procedures under anaerobic conditions. No plasmid DNA could be detected in the transconjugants selected on a minimal medium in the presence of tetracycline. DNA-DNA hybridization experiments with restricted chromosomal DNA using biotinylated pAM120::Tn916 as probe revealed the presence of homologous sequences in the transconjugants but not in Clostridium acetobutylicum wild type. The transconjugants were used as donors in mating experiments with tetracycline-sensitive Bacillus subtilis and Streptococcus lactis subspec. diacetylactis. In both cases tetracycline-resistant strains were found. Transfer frequencies in these experiments were less than 10-7 per recipient. |
| |
Keywords: | Clostridium acetobutylicum Conjugal transfer Streptococcal transposons Tn916 Tn917 Tn925 |
本文献已被 SpringerLink 等数据库收录! |