Two independent replicons can support replication of the anthrax toxin-encoding plasmid pXO1 of Bacillus anthracis.

Two independent replicons can support replication of the anthrax toxin-encoding plasmid pXO1 of Bacillus anthracis.
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DOI:
10.1016/j.plasmid.2011.12.012
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发表时间:
2012-03
期刊:
影响因子:
2.6
通讯作者:
Khan SA
Khan SA
中科院分区:
生物学3区
文献类型:
--
作者:
Akhtar P;Khan SA

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炭疽芽孢杆菌pXO1大质粒(181.6 kb)编码炭疽毒素蛋白。先前的研究表明,当将pXO1的两个独立区域引入该生物体的无质粒菌株时,可以支持pXO1微质粒的复制。目前还没有关于上述两个复制子(称为RepX和ORFs 14/16复制子)支持全长pXO1质粒复制的能力的信息。我们通过TargeTron插入突变使RepX或ORFs 14/16复制子失活,从而产生全长pXO1质粒突变体。将仅含有RepX或ORFs 14/16复制子的质粒pXO1衍生物引入无质粒的炭疽芽孢杆菌菌株中,能够进行复制。质粒拷贝数分析表明,ORFs的14/16复制子比RepX的复制子效率更高。我们的研究表明,RepX和ORFs 14/16复制子都可以独立支持全长pXO1质粒的复制。
The large pXO1 plasmid (181.6 kb) of Bacillus anthracis encodes the anthrax toxin proteins. Previous studies have shown that two separate regions of pXO1 can support replication of pXO1 miniplasmids when introduced into plasmid-less strains of this organism. No information is currently available on the ability of the above two replicons, termed RepX and ORFs 14/16 replicons, to support replication of the full-length pXO1 plasmid. We generated mutants of the full-length pXO1 plasmid in which either the RepX or the ORFs 14/16 replicon was inactivated by TargeTron insertional mutagenesis. Plasmid pXO1 derivatives containing only the RepX or the ORFs 14/16 replicon were able to replicate when introduced into a plasmid-less B. anthracis strain. Plasmid copy number analysis showed that the ORFs 14/16 replicon is more efficient than the RepX replicon. Our studies demonstrate that both the RepX and ORFs 14/16 replicons can independently support the replication of the full-length pXO1 plasmid.
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