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• W2162187955 endingPage "6661" @default.
• W2162187955 startingPage "6654" @default.
• W2162187955 abstract "Campylobacter fetus cells possess multiple promoterless sap homologs, each capable of expressing a surface layer protein (SLP) by utilizing a unique promoter present on a 6.2-kb invertible element. Each sap homolog includes a 626-bp 5' conserved region (FCR) with 74 bp upstream and 552 bp within the open reading frame. After DNA inversion, the splice is seamless because the FCRs are identical. In mutant strain 23D:ACA2K101, in which sapA and sapA2 flanking the invertible element in opposite orientations were disrupted by promoterless chloramphenicol resistance (Cm(r)) and kanamycin resistance (Km(r)) cassettes, respectively, the frequency of DNA inversion is 100-fold lower than that of wild-type strain 23D. To define the roles of a 15-bp inverted repeat (IR) and a Chi-like site (CLS) in the FCR, we mutagenized each upstream of sapA2 in 23D:ACA2K101 by introducing NotI and KpnI sites to create strains 23D:ACA2K101N and 23D:ACA2K101K, respectively. Alternatively selecting colonies for Cm(r) or Km(r) showed that mutagenizing the IR or CLS had no apparent effect on the frequency of the DNA inversion. However, mapping the unique NotI or KpnI site in relation to the Cm(r) or Km(r) cassette in the cells that changed phenotype showed that splices occurred both upstream and downstream of the mutated sites. PCR and sequence analyses also showed that the splice could occur in the 425-bp portion of the FCR downstream of the cassettes. In total, these data indicate that C. fetus can use multiple sites within the FCR for its sap-related DNA inversion." @default.
• W2162187955 created "2016-06-24" @default.
• W2162187955 creator A5033749053 @default.
• W2162187955 creator A5034019676 @default.
• W2162187955 creator A5049403535 @default.
• W2162187955 creator A5065295461 @default.
• W2162187955 date "2001-11-15" @default.
• W2162187955 modified "2023-09-25" @default.
• W2162187955 title "<i>Campylobacter fetus</i>Uses Multiple Loci for DNA Inversion within the 5′ Conserved Regions of<i>sap</i>Homologs" @default.
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• W2162187955 doi "https://doi.org/10.1128/jb.183.22.6654-6661.2001" @default.
• W2162187955 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/95497" @default.
• W2162187955 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/11673436" @default.
• W2162187955 hasPublicationYear "2001" @default.
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