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Rola regulacji ekspresji genów w stabilności plazmidów

100%
Jagura-Burdzy G.
Kosmos
|
2002
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vol. 51
|
issue 3
319-330
EN
Summary Plasmid survival relies heavily on the regulation of gene expression assuring the balance between the necessity of a certain level of plasmid genetic information being expressed and minimalization of the metabolic burden imposed on the host. The most commonly used regulatory mechanisms are autogenous repression and antisense RNA-mRNA interactions which provide the systems with economy, simplicity, sensitivity and possibility of rapid response to internal and external changes. IncP-1 plasmids are described in more detail as the paradigm of a multivalent regulatory network, responsible for tight repression, coordination and fine-tuning of almost all plasmid functions and providing simultaneously a high level of security to plasmid genome. Appropriate recognition and use of environmental stimuli as very important factors in plasmid biology is nicely exhibited by Ti plasmids of Agrobacterium tumefaciens and pheromone-responsive plasmids of Enterococcus faecalis.
2
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Spread and survival of promiscuous IncP-1 plasmids

63%
Adamczyk M., Jagura-Burdzy G.
|
2003
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vol. 50
|
issue 2
425-453
EN
Plasmids classified to the IncP-1 incompatibility group belong to the most stably maintained mobile elements among low copy number plasmids known to date. The remarkable persistence is achieved by various tightly controlled stability mechanisms like active partitioning, efficient conjugative transfer system, killing of plasmid-free segregants and multimer resolution. The unique feature of IncP-1 plasmids is the central control operon coding for global regulators which control the expression of genes involved in vegetative replication, stable maintenance and conjugative transfer. The multivalent regulatory network provides means for coordinated expression of all plasmid functions. The current state of knowledge about two fully sequenced plasmids RK2 and R751, representatives of the IncP-1α and IncP-1β subgroups, is presented.
3
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Bacterial chromosome segregation.

63%
Bartosik A. A., Jagura-Burdzy G.
|
2005
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vol. 52
|
issue 1
1-34
EN
In most bacteria two vital processes of the cell cycle: DNA replication and chromosome segregation overlap temporally. The action of replication machinery in a fixed location in the cell leads to the duplication of oriC regions, their rapid separation to the opposite halves of the cell and the duplicated chromosomes gradually moving to the same locations prior to cell division. Numerous proteins are implicated in co-replicational DNA segregation and they will be characterized in this review. The proteins SeqA, SMC/MukB, MinCDE, MreB/Mbl, RacA, FtsK/SpoIIIE playing different roles in bacterial cells are also involved in chromosome segregation. The chromosomally encoded ParAB homologs of active partitioning proteins of low-copy number plasmids are also players, not always indispensable, in the segregation of bacterial chromosomes.
4
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Cloning of cysB mutant alleles of S. typhimurium

38%
Jagura-Burdzy G., Hulanicka D.
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issue 1
35-44
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