Evaluation of biological and physical protection against nuclease degradation of clay-bound plasmid DNA

被引:179
作者
Demanèche, S
Jocteur-Monrozier, L
Quiquampoix, H
Simonet, P
机构
[1] Univ Lyon 1, Lab Ecol Microbienne, UMR 5557, F-69622 Villeurbanne, France
[2] Ecole Natl Super Agron Montpellier, INRA, Lab Sci Sol, F-34060 Montpellier 01, France
关键词
D O I
10.1128/AEM.67.1.293-299.2001
中图分类号
Q81 [生物工程学(生物技术)]; Q93 [微生物学];
学科分类号
071005 ; 0836 ; 090102 ; 100705 ;
摘要
In order to determine the mechanisms involved in the persistence of extracellular DNA in soils and to monitor whether bacterial transformation could occur in such an environment, we developed artificial models composed of plasmid DNA adsorbed on clay particles. We determined that clay-bound DNA submitted to an increasing range of nuclease concentrations was physically protected. The protection mechanism was mainly related to the adsorption of the nuclease on the clay mineral. The biological potential of the resulting DNA was monitored by transforming the naturally competent proteobacterium Acinetobacter sp, strain BD413, allowing us to demonstrate that adsorbed DNA was only partially available for transformation. This part of the clay-bound DNA which was available for bacteria, was also accessible to nucleases, while the remaining fraction escaped both transformation and degradation. Finally, transformation efficiency was related to the perpetuation mechanism, with homologous recombination being less sensitive to nucleases than autonomous replication, which requires intact molecules.
引用
收藏
页码:293 / 299
页数:7
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