In vitrosite-specific recombination mediated by the tyrosine recombinase XerA ofThermoplasma acidophilum
| Autor: | Jo, Minji, Murayama, Yasuto, Tsutsui, Yasuhiro, Iwasaki, Hiroshi |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
0301 basic medicine
Cell division Thermoplasma Archaeal Proteins In Vitro Techniques Substrate Specificity Recombinases 03 medical and health sciences Genetics Consensus sequence Recombinase Translocase Site-specific recombination Recombination Genetic Binding Sites biology Thermoplasma acidophilum Chromosome Cell Biology biology.organism_classification DNA Archaeal 030104 developmental biology Mutation biology.protein Tyrosine Homologous recombination Genome Bacterial Plasmids |
| Zdroj: | Genes to Cells. 22:646-661 |
| ISSN: | 1356-9597 |
| DOI: | 10.1111/gtc.12503 |
| Popis: | In organisms with circular chromosomes, such as bacteria and archaea, an odd number of homologous recombination events can generate a chromosome dimer. Such chromosome dimers cannot be segregated unless they are converted to monomers before cell division. In Escherichia coli, dimer-to-monomer conversion is mediated by the paralogous XerC and XerD recombinases at a specific dif site in the replication termination region. Dimer resolution requires the highly conserved cell division protein/chromosome translocase FtsK, and this site-specific chromosome resolution system is present or predicted in most bacteria. However, most archaea have only XerA, a homologue of the bacterial XerC/D proteins, but no homologues of FtsK. In addition, the molecular mechanism of XerA-mediated chromosome resolution in archaea has been less thoroughly elucidated than those of the corresponding bacterial systems. In this study, we identified two XerA-binding sites (dif1 and dif2) in the Thermoplasma acidophilum chromosome. In vitro site-specific recombination assays showed that dif2, but not dif1, serves as a target site for XerA-mediated chromosome resolution. Mutational analysis indicated that not only the core consensus sequence of dif2, but also its flanking regions play important roles in the recognition and recombination reactions mediated by XerA. |
| Databáze: | OpenAIRE |
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