3a5y

Crystal structure of GenX from Escherichia coli in complex with lysyladenylate analog

spinqualitylabelsall models 3a5y, resolution 1.90Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3a5y is a 4 chain structure with sequence from Escherichia coli. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: KAA Gene: ECs5136, GenX (Escherichia coli) Activity: Lysine--tRNA ligase, with EC number 6.1.1.6 Resources: FirstGlance, OCA, RCSB, PDBsum Function [C3SGA2_ECOLX] 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' (By similarity).[HAMAP-Rule:MF_00174] 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 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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