The IS10 antisense RNA blocks ribosome binding at the transposase translation initiation site.

AUTOR(ES)

Ma, C

RESUMO

Transposase (tnp) expression from insertion sequence IS10 is controlled, in part, by an antisense RNA, RNA-OUT, which pairs to the translation initiation region of the tnp mRNA, RNA-IN. Genetic experiments suggest that control occurs post-transcriptionally. Here, we present evidence that bears on the control mechanism. Specific ribosome binding at the tnp translation initiation site is demonstrated in vitro. Two mutations that alter tnp translation in vivo are shown to have corresponding effects in vitro. Most importantly, RNA-OUT/RNA-IN pairing is shown to block ribosome binding. In conjunction with the work described in the accompanying paper, we propose that inhibition of ribosome binding also occurs in vivo, and that it is sufficient to account for control. Implications for translational control in analogous systems are discussed.

Documentos Relacionados

• The IS10 transposase mRNA is destabilized during antisense RNA control.
• Translation start of IS10 transposase protein.
• IS10 transposase mutations that specifically alter target site recognition.
• Initiation of translation with Pseudomonas aeruginosa phage PP7 RNA: nucleotide sequence of the coat cistron ribosome binding site.
• Intragenic Suppression of Integration-Defective Is10 Transposase Mutants