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• W2052500901 abstract "The interactions of the second RNA-binding domain of the Drosophila melanogaster Sex-lethal protein (Sxl RBD2) with the oligoribonucleotides, GUUUUUUUU (GU8) and CUAGUG, representing the sequences surrounding an alternative 3′-splicing site of the transformer pre-mRNA (GU8CUAGUG), were studied using heteronuclear two-dimensional NMR techniques. The 1H and 15N chemical shifts of the backbone amide resonances upon titration of Sxl RBD2 with each of these RNAs were recorded. It was found that Sxl RBD2 can bind not only to the polyuridine tract, GU8, but also to the downstream 3′ splice-site sequence, CUAGUG, with similar affinities. In contrast, a nonspecific sequence, C8, did not bind to Sxl RBD2. This result is consistent with previous in vitro RNA-selection and UV-cross-linking results which indicated that the Sex-lethal protein binds to the uridine stretch and the AG dinucleotide in the consensus sequence, AUnNnAGU. In both cases, the chemical-shift perturbations were significant for almost the same amino acid residues, including the two central β-strands formed by the RNP2-motif and RNP1-motif with the two highly conserved aromatic residues (Y214 and F256) in the middle. As the first RNA-binding domain of Sex-lethal (Sxl RBD1) has a characteristic aliphatic residue at one of the two corresponding positions (I128 and F170), Y214 of Sxl RBD2 was replaced by Ile using site-directed mutagenesis. On the one hand, the 1H and 15N chemical-shift perturbations indicated that GU8 binds to the same interface of mutant Sxl RBD2 as of wild-type Sxl RBD2, although its binding affinity was decreased significantly. On the other hand, the specific binding of Sxl RBD2 to CUAGUG was abolished almost completely by the Y→I mutation. Taken together, the present results indicate that the interface residues that bind with GU8 and CUAGUG are much the same, but the role of the Y214 residue is clearly different between these two target sequences." @default.
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• W2052500901 date "1999-03-05" @default.
• W2052500901 modified "2023-10-11" @default.
• W2052500901 title "Chemical shift perturbation studies of the interactions of the second RNA-binding domain of the Drosophila sex-lethal protein with the transformer pre-mRNA polyuridine tract and 3' splice-site sequences" @default.
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• W2052500901 doi "https://doi.org/10.1046/j.1432-1327.1999.00157.x" @default.
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