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• W1515880520 endingPage "5667" @default.
• W1515880520 startingPage "5660" @default.
• W1515880520 abstract "The vir regions of octopine-type and nopaline-type Ti plasmids direct the transfer of oncogenic T-DNA from Agrobacterium tumefaciens to the nuclei of host plant cells. Previous studies indicate that at least two genetic loci at the left ends of these two vir regions are sufficiently conserved to form heteroduplexes visible in the electron microscope. To initiate an investigation of these genetic loci, we determined the DNA sequences of these regions of both Ti plasmids and identified both conserved loci. One of these is the 2.5-kb virH locus, which was previously identified on the octopine-type Ti plasmid but thought to be absent from the nopaline-type Ti plasmid. The virH operon contains two genes that resemble P-450-type monooxygenases. The other locus encodes a 0.5-kb gene designated virK. In addition, we identified other potential genes in this region that are not conserved between these two plasmids. To determine (i) whether these genes are members of the vir regulon and, (ii) whether they are required for tumorigenesis, we used a genetic technique to disrupt each gene and simultaneously fuse its promoter to lacZ. Expression of these genes was also measured by nuclease S1 protection assays. virK and two nonconserved genes, designated virL and virM, were strongly induced by the vir gene inducer acetosyringone. Disruptions of virH, virK, virL, or virM did not affect tumorigenesis of Kalanchöe diagramontiana leaves or carrot disks, suggesting that they may play an entirely different role during pathogenesis." @default.
• W1515880520 created "2016-06-24" @default.
• W1515880520 creator A5028438967 @default.
• W1515880520 creator A5068127891 @default.
• W1515880520 date "1998-11-01" @default.
• W1515880520 modified "2023-09-27" @default.
• W1515880520 title "Wound-Released Chemical Signals May Elicit Multiple Responses from an Agrobacterium tumefaciens Strain Containing an Octopine-Type Ti Plasmid" @default.
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• W1515880520 doi "https://doi.org/10.1128/jb.180.21.5660-5667.1998" @default.
• W1515880520 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/107625" @default.
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• W1515880520 hasPublicationYear "1998" @default.
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