Back to Search
Start Over
Pseudouridine and ribothymidine formation in the tRNA-like domain of turnip yellow mosaic virus RNA
- Source :
- Nucleic Acids Research. 26:3991-3997
- Publication Year :
- 1998
- Publisher :
- Oxford University Press (OUP), 1998.
-
Abstract
- The last 82 nucleotides of the 6.3 kb genomic RNA of plant turnip yellow mosaic virus (TYMV), the so-called 'tRNA-like' domain, presents functional, structural and primary sequence homologies with canonical tRNAs. In particular, one of the stem-loops resembles the TPsi(pseudouridine)-branch of tRNA, except for the presence of a guanosine at position 37 (numbering is from the 3'-end) instead of the classical uridine-55 in tRNA (numbering is from the 5'-end). Both the wild-type TYMV-RNA fragment and a variant, TYMV-mut G37U in which G-37 has been replaced by U-37, have been tested as potential substrates for the yeast tRNA modification enzymes. Results indicate that two modified nucleotides were formed upon incubation of the wild-type TYMV-fragment in a yeast extract: one Psi which formed quantitatively at position 65, and one ribothymidine (T) which formed at low level at position U-38. In the TYMV-mutant G37U, besides the quantitative formation of both Psi-65 and T-38, an additional Psi was detected at position 37. Modified nucleotides Psi-65, T-38 and Psi-37 in TYMV RNA are equivalent to Psi-27, T-54 and Psi-55 in tRNA, respectively. Purified yeast recombinant tRNA:Psisynthases (Pus1 and Pus4), which catalyze respectively the formation of Psi-27 and Psi-55 in yeast tRNAs, are shown to catalyze the quantitative formation of Psi-65 and Psi-37, respectively, in the tRNA-like 3'-domain of mutant TYMV RNA in vitro . These results are discussed in relation to structural elements that are needed by the corresponding enzymes in order to catalyze these post-transcriptional modification reactions.
- Subjects :
- TRNA modification
Molecular Sequence Data
Guanosine
Pseudouridine
chemistry.chemical_compound
RNA, Transfer
Genetics
Nucleotide
Tymovirus
RNA Processing, Post-Transcriptional
Intramolecular Transferases
Uridine
Hydro-Lyases
chemistry.chemical_classification
Turnip yellow mosaic virus
Base Sequence
biology
Nucleic acid sequence
RNA
biology.organism_classification
Biochemistry
chemistry
Transfer RNA
Nucleic Acid Conformation
RNA, Viral
Research Article
Subjects
Details
- ISSN :
- 13624962
- Volume :
- 26
- Database :
- OpenAIRE
- Journal :
- Nucleic Acids Research
- Accession number :
- edsair.doi.dedup.....c641ad1bafd912ec7a52391ff4569306