Evolutionary dynamics of tryptophan tRNAs in Mycoplasma capricolum
Copyright policy )Evolutionary dynamics of tryptophan tRNAs in Mycoplasma capricolum
Mycoplasma capricolum uses two tryptophan codons, the "universal" nonsense codon UGA and the universal codon UGG. The bacterium contains two tryptophan tRNAs, one with anticodon UCA, (U: 2'-O-methyl U derivative), and the other with CCA (5'-C: partially 2'-O-methylated). tRNAUCA would translate codons UGA and probably UGG by wobbling. tRNACCA is much less charged by tryptophan in the cells than tRNAUCA, and the intracellular amount of tRNACCA is 5-10 times lower than that of tRNAUCA. The genes for these two tRNAs are separated by a terminator-like structure in a single operon. In vitro transcription experiments suggest that the predominance of tRNAUCA over tRNACCA results from the attenuation of transcription by this terminator-like structure.
- Nagoya University Japan
- National Institute of Genetics Japan
Base Sequence, Transcription, Genetic, Molecular Sequence Data, DNA-Directed RNA Polymerases, RNA, Transfer, Amino Acid-Specific, RNA, Transfer, Trp, Biological Evolution, Mycoplasma, Gene Expression Regulation, Genes, Bacterial, Nucleic Acid Conformation, Plasmids
Base Sequence, Transcription, Genetic, Molecular Sequence Data, DNA-Directed RNA Polymerases, RNA, Transfer, Amino Acid-Specific, RNA, Transfer, Trp, Biological Evolution, Mycoplasma, Gene Expression Regulation, Genes, Bacterial, Nucleic Acid Conformation, Plasmids
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