Stable tRNA precursors in HeLa cells.
AUTOR(ES)
Harada, F
RESUMO
Two tRNA precursors were isolated from 32P-labeled or unlabeled HeLa cells by two dimensional polyacrylamide gel electrophoresis, and were sequenced. These were the precursors of tRNAMet and tRNALeu, and both contained four extra nucleotides including 5'-triphosphates at their 5'-end and nine extra nucleotides including oligo U at their 3'-end. These RNAs are the first naturally occurring tRNA precursors from higher eukaryotes whose sequences have been determined. In these molecules, several modified nucleosides such as m2G, t6A and ac4C in mature tRNAs were undermodified. Two additional hydrogen bonds were formed in the clover leaf structures of these tRNA precursors. These extra hydrogen bonds may be responsible for the stabilities of these tRNA precursors.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=320459Documentos Relacionados
- Involvement of protein kinase C in the control of tRNA modification with queuine in HeLa cells.
- Specific RNA-cleaving activities from HeLa cells.
- Mitochondrial origin of membrane-associated heterogeneous RNA in HeLa cells.
- A membrane-associated RNA of cytoplasmic origin in HeLa cells.
- Translational inhibition in mitotic HeLa cells.