6533b86efe1ef96bd12cc920
RESEARCH PRODUCT
Kti12, a PSTK-like tRNA dependent ATPase essential for tRNA modification by Elongator
Michael J. R. StarkRene ZabelKarin D. BreunigSebastian GlattRościsław KrutyhołowaMark HelmAnnekathrin Reinhardt-tewsRaffael SchaffrathAlexander HammermeisterWael Abdel-fattahsubject
TRNA modificationSaccharomyces cerevisiae ProteinsProtein ConformationWobble base pairSaccharomyces cerevisiaeBiologyChaetomiumCrystallography X-Ray03 medical and health scienceschemistry.chemical_compound0302 clinical medicineRNA TransferATP hydrolysisGeneticsRNA and RNA-protein complexesAnticodonRNA Processing Post-TranscriptionalUridine030304 developmental biologyAdaptor Proteins Signal TransducingAdenosine Triphosphatases0303 health sciencesSelenocysteineRNATRNA bindingCell biologychemistryTransfer RNASelenocysteine incorporationCarrier ProteinsRibosomes030217 neurology & neurosurgerydescription
Abstract Posttranscriptional RNA modifications occur in all domains of life. Modifications of anticodon bases are of particular importance for ribosomal decoding and proteome homeostasis. The Elongator complex modifies uridines in the wobble position and is highly conserved in eukaryotes. Despite recent insights into Elongator's architecture, the structure and function of its regulatory factor Kti12 have remained elusive. Here, we present the crystal structure of Kti12′s nucleotide hydrolase domain trapped in a transition state of ATP hydrolysis. The structure reveals striking similarities to an O-phosphoseryl-tRNA kinase involved in the selenocysteine pathway. Both proteins employ similar mechanisms of tRNA binding and show tRNASec-dependent ATPase activity. In addition, we demonstrate that Kti12 binds directly to Elongator and that ATP hydrolysis is crucial for Elongator to maintain proper tRNA anticodon modification levels in vivo. In summary, our data reveal a hitherto uncharacterized link between two translational control pathways that regulate selenocysteine incorporation and affect ribosomal tRNA selection via specific tRNA modifications.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2019-03-01 |