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- W2022074246 abstract "UaY is the specific ZnII(2)Cys(6) transcriptional activator of the purine utilisation pathway in Aspergillus nidulans. Previous work has determined the consensus binding sequence by EMSA and foot-printing. We determine here that it binds as a dimer to its cognate CGG-N(6)-CCG sites. We identify the uaY109 mutation, which has been shown to affect differentially the expression of a number of UaY-regulated genes, as a F112I substitution in the DNA-binding motif dimerisation domain. We isolated back mutants, revertants carrying different residues at the same position (I112N and I112M) and intragenic suppressors mapping in the first loop of the Zn cluster (N75T and N75K). We have analysed the original mutant and its revertants by growth tests and by their effects on the mRNA steady states of five UaY-regulated genes. We have determined the effect of the different mutations on UaY dimerisation, on the apparent Kdiss of the UaY DNA-binding domain to appropriate DNA sequences and on the methylation interference pattern. We have attempted to rationalise these phenotypes by modelling the UaY DNA binding domain on the structure of the highly similar Ppr1p. However, modelling of the wild-type and mutant proteins provides only a partial explanation for the observed phenotypes. This suggests that the mutated residues may have other roles besides the obvious ones inferred from their position in the sequence and by the similarity of UaY and Ppr1p." @default.
- W2022074246 created "2016-06-24" @default.
- W2022074246 creator A5010744257 @default.
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- W2022074246 creator A5041278644 @default.
- W2022074246 creator A5056710920 @default.
- W2022074246 creator A5087138064 @default.
- W2022074246 date "2012-09-01" @default.
- W2022074246 modified "2023-09-25" @default.
- W2022074246 title "Mutations in the basic loop of the Zn binuclear cluster of the UaY transcriptional activator suppress mutations in the dimerisation domain" @default.
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- W2022074246 doi "https://doi.org/10.1016/j.fgb.2012.06.009" @default.
- W2022074246 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/22760060" @default.
- W2022074246 hasPublicationYear "2012" @default.
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