Molecular structure of bacterial plasmids.

Molecular structure of bacterial plasmids.

INTRODUCTION AND DEFINITIONS ...................................... 361 SOME PROPERTIES OF BACTERIAL PLASMIDS .......................... 362 Chromosomal Integration ............... .................................... 363 Fertility Repression........................................................ 363 Incompatibility ............................................................. 364 Elimination ...

Active partitioning of bacterial plasmids.

Phenotypic plasticity in bacterial plasmids.

Plasmid pB15 was previously shown to evolve increased horizontal (infectious) transfer at the expense of reduced vertical (intergenerational) transfer and vice versa, a key trade-off assumed in theories of parasite virulence. Whereas the models predict that susceptible host abundance should determine which mode of transfer is selectively favored, host density failed to mediate the trade-off in ...

Rolling-circle replication of bacterial plasmids.

Many bacterial plasmids replicate by a rolling-circle (RC) mechanism. Their replication properties have many similarities to as well as significant differences from those of single-stranded DNA (ssDNA) coliphages, which also replicate by an RC mechanism. Studies on a large number of RC plasmids have revealed that they fall into several families based on homology in their initiator proteins and ...

Molecular biology of spiroplasma plasmids.

With one exception, all spiroplasma strains examined contained extrachromosomal DNA, most of which was in the form of covalently closed circular plasmids. One plasmid, pIJ2000, carried by Spiroplasma citri strain ASP-1, was purified and characterized and used to probe for related plasmids in other strains. Unsuccessful attempts were made to clone pIJ2000 into Escherichia coli using the vectors ...