The repABC plasmid family

被引:122
作者
Cevallos, Miguel A. [1 ]
Cervantes-Rivera, Ramon [1 ]
Gutierrez-Rios, Rosa Maria [2 ]
机构
[1] Univ Nacl Autonoma Mexico, Programa Genom Evolutiva, Ctr Ciencias Genom, Cuernavaca 62191, Morelos, Mexico
[2] Univ Nacl Autonoma Mexico, Dept Mol Microbiol, Inst Biotecnol, Cuernavaca 62191, Morelos, Mexico
关键词
plasmid replication; plasmid segregation; plasmid evolution; alpha-proteobacteria;
D O I
10.1016/j.plasmid.2008.03.001
中图分类号
Q3 [遗传学];
学科分类号
071007 ; 090102 ;
摘要
repABC plasmids are widely distributed among alpha-proteobacteria. They are especially common in Rhizobiales. Some strains of this bacterial order can contain multiple repABC replicons indicating that this plasmid family includes several incompatibility groups. The replication and stable maintenance of these replicons depend on the presence of a repABC operon. The repABC operons sequenced to date share some general characteristics. All of them contain at least three protein-encoding genes: repA, repB and repC. The first two genes encode proteins involved in plasmid segregation, whereas repC encodes a protein crucial for replication. The origin of replication maps within the repC gene. In contrast, the centromere-like sequence (parS) can be located at various positions in the operon. In thin; review we will summarize current knowledge about this plasmid family, with special emphasis on their structural diversity and their complex genetic regulation. Finally, we will examine some ideas about their evolutionary origin and trends. (C) 2008 Elsevier Inc. All rights reserved.
引用
收藏
页码:19 / 37
页数:19
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