Structural highlights
Function
EPMA_ECOLI With EpmB is involved in the beta-lysylation step of the post-translational modification of translation elongation factor P (EF-P) on 'Lys-34'. Catalyzes the ATP-dependent activation of (R)-beta-lysine produced by EpmB, forming a lysyl-adenylate, from which the beta-lysyl moiety is then transferred to the epsilon-amino group of EF-P 'Lys-34'. The substrate (R)-beta-lysine is 100-fold more efficient than either (S)-beta-lysine or L-alpha-lysine. Cannot ligate lysine to any tRNA.[HAMAP-Rule:MF_00174][1] [2] [3]
Evolutionary Conservation
Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.
Publication Abstract from PubMed
Aminoacyl-tRNA synthetase (aaRS) paralogs with unknown functions exist in various species. We now report novel 'protein lysylation' by an Escherichia coli lysyl-tRNA synthetase paralog, GenX/PoxA/YjeA. X-ray crystallographic analysis shows that the structure of the GenX protein resembles that of a class II aaRS. Further in vitro studies reveal that it specifically aminoacylates EF-P with lysine. The shape of the protein substrate mimics that of the L-shaped tRNA, and its lysylation site corresponds to the tRNA 3' end. Thus, we show how the aaRS architecture can be adapted to achieve aminoacylation of a specific protein. Moreover, in vivo analyses reveal that the translation elongation factor P (EF-P) lysylation by GenX is enhanced by YjeK (lysine 2,3-aminomutase paralog), which is encoded next to the EF-P gene, and might convert alpha-lysyl-EF-P to beta-lysyl-EF-P. In vivo analyses indicate that the EF-P modification by GenX and YjeK is essential for cell survival.
A paralog of lysyl-tRNA synthetase aminoacylates a conserved lysine residue in translation elongation factor P.,Yanagisawa T, Sumida T, Ishii R, Takemoto C, Yokoyama S Nat Struct Mol Biol. 2010 Sep;17(9):1136-43. Epub 2010 Aug 22. PMID:20729861[4]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Yanagisawa T, Sumida T, Ishii R, Takemoto C, Yokoyama S. A paralog of lysyl-tRNA synthetase aminoacylates a conserved lysine residue in translation elongation factor P. Nat Struct Mol Biol. 2010 Sep;17(9):1136-43. Epub 2010 Aug 22. PMID:20729861 doi:10.1038/nsmb.1889
- ↑ Roy H, Zou SB, Bullwinkle TJ, Wolfe BS, Gilreath MS, Forsyth CJ, Navarre WW, Ibba M. The tRNA synthetase paralog PoxA modifies elongation factor-P with (R)-β-lysine. Nat Chem Biol. 2011 Aug 14;7(10):667-9. PMID:21841797 doi:10.1038/nchembio.632
- ↑ Park JH, Johansson HE, Aoki H, Huang BX, Kim HY, Ganoza MC, Park MH. Post-translational modification by β-lysylation is required for activity of Escherichia coli elongation factor P (EF-P). J Biol Chem. 2012 Jan 20;287(4):2579-90. PMID:22128152 doi:10.1074/jbc.M111.309633
- ↑ Yanagisawa T, Sumida T, Ishii R, Takemoto C, Yokoyama S. A paralog of lysyl-tRNA synthetase aminoacylates a conserved lysine residue in translation elongation factor P. Nat Struct Mol Biol. 2010 Sep;17(9):1136-43. Epub 2010 Aug 22. PMID:20729861 doi:10.1038/nsmb.1889
