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- Chi_site abstract "A Chi site or Chi sequence is a short stretch of DNA in the genome of a bacterium near which homologous recombination is more likely than expected to occur. Chi sites serve as stimulators of DNA double-strand break repair in bacteria, which can arise from radiation or chemical treatments, or result from replication fork breakage during DNA replication. The sequence of the Chi site is unique to each group of closely related organisms; in E. coli and other enteric bacteria, such as Salmonella, the sequence is 5'-GCTGGTGG-3'. The existence of Chi sites was originally discovered in the genome of bacteriophage lambda, a virus that infects E. coli, but is now known to occur about 1000 times in the E. coli genome.The Chi sequence serves as a signal to the RecBCD helicase-exonuclease that triggers a major change in the activities of this enzyme. Upon encountering the Chi sequence as it unwinds DNA, RecBCD cuts the DNA a few nucleotides to the 3’ side of Chi; depending on the reaction conditions, this cut is either a simple nick on one strand or the change of nuclease activity from cutting the 3’-ended strand to cutting the 5’ended strand. In either case the resulting 3’ single-stranded DNA (ssDNA) is bound by multiple molecules of RecA protein that facilitate "strand invasion," in which one strand of a homologous double-stranded DNA is displaced by the RecA-associated ssDNA. Strand invasion forms a joint DNA molecule called a D-loop. Resolution of the D-loop is thought to occur by replication primed by the 3’ end generated at Chi (in the D-loop). Alternatively, the D-loop may be converted into a Holliday junction by cutting of the D-loop and a second exchange of DNA strands; the Holliday junction can be converted into linear duplex DNA by cutting of the Holliday junction and ligation of the resultant nicks. Either type of resolution can generate recombinant DNA molecules if the two interacting DNAs are genetically different, as well as repair the initially broken DNA.Chi sites are sometimes referred to as "recombination hot spots". The name "Chi" is an abbreviation of crossover hotspot instigator. The term is sometimes written as "χ site", using the Greek letter chi.".
- Chi_site wikiPageExternalLink recombination.html.
- Chi_site wikiPageID "23577988".
- Chi_site wikiPageLength "3268".
- Chi_site wikiPageOutDegree "21".
- Chi_site wikiPageRevisionID "584001385".
- Chi_site wikiPageWikiLink 3.
- Chi_site wikiPageWikiLink 5.
- Chi_site wikiPageWikiLink Bacteria.
- Chi_site wikiPageWikiLink Bacteriophage_lambda.
- Chi_site wikiPageWikiLink Bacterium.
- Chi_site wikiPageWikiLink Category:Biochemistry.
- Chi_site wikiPageWikiLink Category:Genetics.
- Chi_site wikiPageWikiLink Chi_(letter).
- Chi_site wikiPageWikiLink DNA.
- Chi_site wikiPageWikiLink DNA_repair.
- Chi_site wikiPageWikiLink DNA_replication.
- Chi_site wikiPageWikiLink DNA_sequence.
- Chi_site wikiPageWikiLink Directionality_(molecular_biology).
- Chi_site wikiPageWikiLink Escherichia_coli.
- Chi_site wikiPageWikiLink Exonuclease.
- Chi_site wikiPageWikiLink Genome.
- Chi_site wikiPageWikiLink Holliday_junction.
- Chi_site wikiPageWikiLink Homologous_recombination.
- Chi_site wikiPageWikiLink Lambda_phage.
- Chi_site wikiPageWikiLink Nucleic_acid_sequence.
- Chi_site wikiPageWikiLink Radiation.
- Chi_site wikiPageWikiLink RecA.
- Chi_site wikiPageWikiLink RecBCD.
- Chi_site wikiPageWikiLink Replication_fork.
- Chi_site wikiPageWikiLink Virus.
- Chi_site wikiPageWikiLinkText "Chi site".
- Chi_site wikiPageWikiLinkText "Chi".
- Chi_site wikiPageWikiLinkText "chi sequences".
- Chi_site hasPhotoCollection Chi_site.
- Chi_site subject Category:Biochemistry.
- Chi_site subject Category:Genetics.
- Chi_site hypernym Stretch.
- Chi_site type Road.
- Chi_site comment "A Chi site or Chi sequence is a short stretch of DNA in the genome of a bacterium near which homologous recombination is more likely than expected to occur. Chi sites serve as stimulators of DNA double-strand break repair in bacteria, which can arise from radiation or chemical treatments, or result from replication fork breakage during DNA replication. The sequence of the Chi site is unique to each group of closely related organisms; in E.".
- Chi_site label "Chi site".
- Chi_site sameAs Sekwencja_Chi.
- Chi_site sameAs m.06w3zhx.
- Chi_site sameAs Q5095123.
- Chi_site sameAs Q5095123.
- Chi_site wasDerivedFrom Chi_site?oldid=584001385.
- Chi_site isPrimaryTopicOf Chi_site.