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• W1553440003 endingPage "503" @default.
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• W1553440003 abstract "Essential steps in the uptake and catabolism of the plant tumor metabolites nopaline and octopine in Agrobacterium spp. are performed by proteins encoded in the nopaline catabolic (noc) and octopine catabolic (occ) regions of Ti plasmids. We investigated the opine activation of the genes by using (i) promoter studies of Agrobacterium spp. and (ii) analysis of the promoter interaction with the regulatory proteins NocR (noc) and OccR (occ). The noc region contained two nopaline-induced promoters (Pi1[noc] and Pi2[noc]) and one autogenously regulated promoter (Pr [control of NocR expression]). Pi2 and Pr overlapped and were divergently oriented (Pi2 [noc]). DNA binding studies and DNase I footprints indicated that NocR bound specifically to single binding sites in Pi1[noc] and Pi2/Pr[noc] and that Pi2 and Pr were regulated from the same binding site. The binding was independent of the inducer nopaline, and nopaline caused small changes in the footprint. The promoters in the noc and occ regions shared sequence motif and contained the sequence T-N11-A, which is characteristic for LysR-type-regulated promoters. The occ region contained one octopine-induced and one autogenously regulated promoter (Pi/Pr[occ]) in the same arrangement as Pi2/Pr[noc] in the noc region. Promoter deletions indicated that sequences flanking the OccR binding site determined the extent of induction, although they did not bind OccR. The promoter bound OccR in the absence and presence of octopine. The opine caused a change in the mobility of the DNA-protein complex with the complete promoter. The resected fragments did not reveal this opine-induced shift, and it was also not detectable with the DNA-NocR complexes with the two promoters of the noc region." @default.
• W1553440003 created "2016-06-24" @default.
• W1553440003 creator A5044242760 @default.
• W1553440003 creator A5082515982 @default.
• W1553440003 creator A5091249662 @default.
• W1553440003 date "1994-01-01" @default.
• W1553440003 modified "2023-10-01" @default.
• W1553440003 title "Opine-regulated promoters and LysR-type regulators in the nopaline (noc) and octopine (occ) catabolic regions of Ti plasmids of Agrobacterium tumefaciens" @default.
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• W1553440003 doi "https://doi.org/10.1128/jb.176.2.495-503.1994" @default.
• W1553440003 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/205073" @default.
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