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Old 11-18-2010, 09:15 PM
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Default Interactions of a didomain fragment of the Drosophila sex-lethal protein with single-

Interactions of a didomain fragment of the Drosophila sex-lethal protein with single-stranded uridine-rich oligoribonucleotides derived from the transformer and Sex-lethal messenger RNA precursors: NMR with residue-selective [5-2H]uridine substitutions.

Related Articles Interactions of a didomain fragment of the Drosophila sex-lethal protein with single-stranded uridine-rich oligoribonucleotides derived from the transformer and Sex-lethal messenger RNA precursors: NMR with residue-selective [5-2H]uridine substitutions.

J Biomol NMR. 2000 Jun;17(2):153-65

Authors: Kim I, Muto Y, Watanabe S, Kitamura A, Futamura Y, Yokoyama S, Hosono K, Kawai G, Takaku H, Dohmae N, Takio K, Saskamoto H, Shimura Y

Proteins that contain two or more copies of the RNA-binding domain [ribonucleoprotein (RNP) domain or RNA recognition motif (RRM)] are considered to be involved in the recognition of single-stranded RNA, but the mechanisms of this recognition are poorly understood at the molecular level. For an NMR analysis of a single-stranded RNA complexed with a multi-RBD protein, residue-selective stable-isotope labeling techniques are necessary, rather than common assignment methods based on the secondary structure of RNA. In the present study, we analyzed the interaction of a Drosophila Sex-lethal (Sx1) protein fragment, consisting of two RBDs (RBD1-RBD2), with two distinct target RNAs derived from the tra and Sxl mRNA precursors with guanosine and adenosine, respectively, in a position near the 5'-terminus of a uridine stretch. First, we prepared a [5-2H]uridine phosphoramidite, and synthesized a series of 2H-labeled RNAs, in which all of the uridine residues except one were replaced by [5-2H]uridine in the target sequence, GU8C. By observing the H5-H6 TOCSY cross peaks of the series of 2H-labeled RNAs complexed with the Sx1 RBDI-RBD2, all of the base H5-H6 proton resonances of the target RNA were unambiguously assigned. Then, the H5-H6 cross peaks of other target RNAs, GU2GU8, AU8, and UAU8, were assigned by comparison with those of GU8C. We found that the uridine residue prior to the G or A residue is essential for proper interaction with the protein, and that the interaction is tighter for A than for G. Moreover, the H1' resonance assignments were achieved from the H5-H6 assignments. The results revealed that all of the protein-bound nucleotide residues, except for only two, are in the unusual C2'-endo ribose conformation in the complex.

PMID: 10921779 [PubMed - indexed for MEDLINE]



Source: PubMed
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