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Volkwein, Wolfram; Krafczyk, Ralph; Jagtap, Pravin Kumar Ankush; Parr, Marina; Mankina, Elena; Macosek, Jakub; Guo, Zhenghuan; Fuerst, Maximilian Josef Ludwig Johannes; Pfab, Miriam; Frishman, Dmitrij; Hennig, Janosch; Jung, Kirsten; Lassak, Jürgen (2019): Switching the Post-translational Modification of Translation Elongation Factor EF-P. In: Frontiers in Microbiology, Vol. 10, 1148
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Abstract

Tripeptides with two consecutive prolines are the shortest and most frequent sequences causing ribosome stalling. The bacterial translation elongation factor P (EF-P) relieves this arrest, allowing protein biosynthesis to continue. A seven amino acids long loop between beta-strands beta 3/beta 4 is crucial for EF-P function and modified at its tip by lysylation of lysine or rhamnosylation of arginine. Phylogenetic analyses unveiled an invariant proline in the -2 position of the modification site in EF-Ps that utilize lysine modifications such as Escherichia coli. Bacteria with the arginine modification like Pseudomonas putida on the contrary have selected against it. Focusing on the EF-Ps from these two model organisms we demonstrate the importance of the beta 3/beta 4 loop composition for functionalization by chemically distinct modifications. Ultimately, we show that only two amino acid changes in E. coli EF-P are needed for switching the modification strategy from lysylation to rhamnosylation.