6g15

Crystal structure of pppGpp bound RbgA from S. aureus

spinqualitylabelsall models 6g15, resolution 1.65Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6g15 is a 2 chain structure with sequence from Staphylococcus aureus subsp. aureus USA300. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.65Å Ligands: C1Z Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function A0A0H2XK72_STAA3 Required for a late step of 50S ribosomal subunit assembly. Has GTPase activity.[PIRNR:PIRNR006230] Publication Abstract from PubMed Efficient adaptation to environmental changes is pivotal for all bacterial cells. Almost all bacterial species depend on the conserved stringent response system to prompt timely transcriptional and metabolic responses according to stress conditions and nutrient depletion. The stringent response relies on the stress-dependent synthesis of the second messenger nucleotides and alarmones (p)ppGpp, which pleiotropically target and reprogram processes that consume cellular resources, such as ribosome biogenesis. Here we show that (p)ppGpp acts on the ribosome biogenesis GTPase A (RbgA) of Gram-positive bacteria. Using X-ray crystallography, hydrogen-deuterium exchange mass spectrometry (HDX-MS) and kinetic analysis, we demonstrate that the alarmones (p)ppGpp bind to RbgA in a manner similar to that of binding by GDP and GTP and therby act as competitive inhibitors. Our structural analysis of Staphylococcus aureus RbgA bound to ppGpp and pppGpp at 1.8 A and 1.65 A resolution, respectively, suggested that the alarmones (p)ppGpp prevent the active GTPase conformation of RbgA by sterically blocking the association of its G2 motif via their 3'-pyrophosphate moieties. Taken together, our structural and biochemical characterization of RbgA in the context of the alarmone-mediated stringent response reveals how (p)ppGpp affects the function of RbgA and reprograms this GTPase to arrest the ribosomal large subunit. Structural basis for (p)ppGpp-mediated inhibition of the GTPase RbgA.,Pausch P, Steinchen W, Wieland M, Klaus T, Freibert SA, Altegoer F, Wilson DN, Bange G J Biol Chem. 2018 Oct 26. pii: RA118.003070. doi: 10.1074/jbc.RA118.003070. PMID:30366986 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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