Resonances of the water exchangeable iminoprotons of the T and anticodon stem of yeast tRNAPhe were assigned by means of Nuclear Overhauser Effects (NOE's). Together with our previous assignments of iminoproton resonances from the acceptor and D stem (A. Heerschap, C.A.G. Haasnoot and C.W. Hilbers (1982) Nucleic Acids Res. 10, 6981-7000) the present results constitute a complete assignment of all resonances of iminoprotons involved in the secondary structure of yeast tRNAPhe with a reliability and spectral resolution not reached heretofore. Separate identification of the methylprotons in m5C40 and m5C49 was also possible due to specific NOE patterns in the lowfield part of the spectrum. Our experiments indicate that in solution the psi 39 residue in the anticodon stem is orientated in a syn conformation in contrast to the normally observed anti orientation of the uracil base in AU basepairs. Evidence is presented that in solution the acceptor stem is stacked upon the T stem. Furthermore, it turns out that in a similar way the anticodon stem forms a continuous stack with the D stem, but here the m2(2)G26 residue is located between the latter two stems (as is found in the X-ray crystal structure). The stacking of these stems is not strictly dependent on the presence of magnesium ions. NOE experiments show that these structural features are preserved when proceeding from a buffer with magnesium ions to a buffer without magnesium ions although differences in chemical shifts and NOE intensities indicate changes in the conformation of the tRNA.
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Evidence ID | Analyze ID | Gene/Complex | Systematic Name/Complex Accession | Qualifier | Gene Ontology Term ID | Gene Ontology Term | Aspect | Annotation Extension | Evidence | Method | Source | Assigned On | Reference |
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Evidence ID | Analyze ID | Gene | Gene Systematic Name | Phenotype | Experiment Type | Experiment Type Category | Mutant Information | Strain Background | Chemical | Details | Reference |
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Evidence ID | Analyze ID | Gene | Gene Systematic Name | Disease Ontology Term | Disease Ontology Term ID | Qualifier | Evidence | Method | Source | Assigned On | Reference |
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Evidence ID | Analyze ID | Regulator | Regulator Systematic Name | Target | Target Systematic Name | Direction | Regulation of | Happens During | Regulator Type | Direction | Regulation Of | Happens During | Method | Evidence | Strain Background | Reference |
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Site | Modification | Modifier | Source | Reference |
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Evidence ID | Analyze ID | Interactor | Interactor Systematic Name | Interactor | Interactor Systematic Name | Allele | Assay | Annotation | Action | Phenotype | SGA score | P-value | Source | Reference | Note |
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Evidence ID | Analyze ID | Interactor | Interactor Systematic Name | Interactor | Interactor Systematic Name | Assay | Annotation | Action | Modification | Source | Reference | Note |
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Complement ID | Locus ID | Gene | Species | Gene ID | Strain background | Direction | Details | Source | Reference |
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Evidence ID | Analyze ID | Dataset | Description | Keywords | Number of Conditions | Reference |
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