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Phosphorylation of Elp1 by Hrr25 is required for Elongator-dependent tRNA modification in yeast

Details zur Publikation
Abdel-Fattah, W.; Jablonowski, D.; Di Santo, R.; Scheidt, V.; Hammermeister, A.; ten Have, S.; Thüring, K.; Helm, M.; Schaffrath, R.; Stark, M.

Zusammenfassung, Abstract
Elongator is a conserved protein complex comprising six different polypeptides that has been ascribed a wide range of functions, but which is now known to be required for modification of uridine residues in the wobble position of a subset of tRNAs in yeast, plants, worms and mammals. In previous work, we showed that Elongator's largest subunit (Elp1; also known as Iki3) was phosphorylated and implicated the yeast casein kinase I Hrr25 in Elongator function. Here we report identification of ninein vivophosphorylation sites within Elp1 and show that four of these, clustered close to the Elp1 C-terminus and adjacent to a region that binds tRNA, are important for Elongator's tRNA modification function. Hrr25 protein kinase directly modifies Elp1 on two sites (Ser-1198 and Ser-1202) and through analyzing non-phosphorylatable (alanine) and acidic, phosphomimic substitutions at Ser-1198, Ser-1202 and Ser-1209, we provide evidence that phosphorylation plays a positive role in the tRNA modification function of Elongator and may regulate the interaction of Elongator both with its accessory protein Kti12 and with Hrr25 kinase.

Zuletzt aktualisiert 2019-01-11 um 16:05