Open Close
Rojas-Benítez, D., Ibar, C., Glavic, A. (2013). The Drosophila EKC/KEOPS complex: Roles in protein synthesis homeostasis and animal growth.  Fly 7(3): 168--172.
FlyBase ID
Publication Type

The TOR signaling pathway is crucial in the translation of nutritional inputs into the protein synthesis machinery regulation, allowing animal growth. We recently identified the Bud32 (yeast)/PRPK (human) ortholog in Drosophila, Prpk (p53-related protein kinase), and found that it is required for TOR kinase activity. Bud32/PRPK is an ancient and atypical kinase conserved in evolution from Archeae to humans, being essential for Archeae. It has been linked with p53 stabilization in human cell culture and its absence in yeast causes a slow-growth phenotype. This protein has been associated to KEOPS (kinase, putative endopeptidase and other proteins of small size) complex together with Kae1p (ATPase), Cgi-121 and Pcc1p. This complex has been implicated in telomere maintenance, transcriptional regulation, bud site selection and chemical modification of tRNAs (tRNAs). Bud32p and Kae1p have been related with N6-threonylcarbamoyladenosine (t (6)A) synthesis, a particular chemical modification that occurs at position 37 of tRNAs that pair A-starting codons, required for proper translation in most species. Lack of this modification causes mistranslations and open reading frame shifts in yeast. The core constituents of the KEOPS complex are present in Drosophila, but their physical interaction has not been reported yet. Here, we present a review of the findings regarding the function of this complex in different organisms and new evidence that extends our recent observations of Prpk function in animal growth showing that depletion of Kae1 or Prpk, in accordance with their role in translation in yeast, is able to induce the unfolded protein response (UPR) in Drosophila. We suggest that EKC/KEOPS complex could be integrating t (6)A-modified tRNA availability with translational rates, which are ultimately reflected in animal growth.

PubMed ID
PubMed Central ID
PMC4049849 (PMC) (EuropePMC)
Related Publication(s)
Research paper

Drosophila p53-related protein kinase is required for PI3K/TOR pathway-dependent growth.
Ibar et al., 2013, Development 140(6): 1282--1291 [FBrf0220916]

Associated Information
Associated Files
Other Information
Secondary IDs
    Language of Publication
    Additional Languages of Abstract
    Parent Publication
    Publication Type
    Publication Year
    1933-6934 1933-6942
    Data From Reference
    Gene Groups (1)
    Genes (3)