O6-Methylguanosine leads to position-dependent effects on ribosome speed and fidelity.

ABSTRACT: Nucleic acids are under constant assault from endogenous and environmental agents that alter their physical and chemical properties. O6-methylation of guanosine (m(6)G) is particularly notable for its high mutagenicity, pairing with T, during DNA replication. Yet, while m(6)G accumulates in both DNA and RNA, little is known about its effects on RNA. Here, we investigate the effects of m(6)G on the decoding process, using a reconstituted bacterial translation system. m(6)G at the first and third position of the codon decreases the accuracy of tRNA selection. The ribosome readily incorporates near-cognate aminoacyl-tRNAs (aa-tRNAs) by forming m(6)G-uridine codon-anticodon pairs. Surprisingly, the introduction of m(6)G to the second position of the codon does not promote miscoding, but instea

SUBMITTER: Hudson BH 

PROVIDER: S-EPMC4536324 | biostudies-literature | 2015 Sep

REPOSITORIES: biostudies-literature