质粒
生物
T-DNA二元系统
遗传学
细菌接合
重组
位点特异性重组
基因
重组DNA
重组酶
载体(分子生物学)
作者
Pengxia Wang,Chunyi Zhang,Yiguang Zhu,Yun Deng,Suxia Guo,Donghai Peng,Lifang Ruan,Ming Sun
标识
DOI:10.1111/1462-2920.12177
摘要
Summary Cointegrate plasmids are useful models for the study of plasmid evolution if their evolutionary processes can be replicated under laboratory conditions. pBMB0228 , a 17 706 bp native plasmid originally isolated from B acillus thuringiensis strain YBT ‐1518, carries two nematicidal crystal protein genes, cry6Aa and cry55Aa . In this study, we show that pBMB0228 is in fact a cointegrate of two plasmids and contains two functional replication regions and two functional mobilization regions. Upon introduction into B . thuringiensis strain BMB171 , pBMB0228 spontaneously resolves into two constituent plasmids via recombination at its oriT1 and oriT2 sites. The resolution does not require conjugation but can be promoted by conjugation. We further confirm that the resolution is mediated by oriT site‐specific recombination requiring Mob02281 or Mob02282 . Additionally, the two constituent plasmids of pBMB0228 are mobilizable, and can fuse back via oriT site‐specific integration after entering into the same cell by conjugation. Our study confirms that native plasmid can reversibly interconvert between a cointegrate structure and its constituent plasmids. This study provides insight into the evolution of cointegrate plasmids, linking plasmid evolution with conjugation and the oriT site‐specific recombination function of relaxase.
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