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Evolutionary dynamics of tryptophan tRNAs in Mycoplasma capricolum

โœ Scribed by Yamao, Fumiaki ;Iwagami, Shoji ;Azumi, Yoshitaka ;Muto, Akira ;Osawa, Syozo ;Fujita, Nobuyuki ;Ishihama, Akira

Publisher
Springer
Year
1988
Tongue
English
Weight
854 KB
Volume
212
Category
Article
ISSN
0026-8925

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โœฆ Synopsis

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.

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