4d6x

Crystal structure of the receiver domain of NtrX from Brucella abortus

spinqualitylabelsall models 4d6x, resolution 2.11Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4d6x is a 4 chain structure with sequence from "bacterium_abortus"_schmidt_in_schmidt_and_weis_1901 "bacterium abortus" schmidt in schmidt and weis 1901. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: IMD Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed Brucella abortus is an important pathogenic bacterium that has to overcome oxygen deficiency in order to achieve a successful infection. Previously, we proved that a two-component system formed by the histidine kinase NtrY and the response regulator NtrX is essential to achieve an adaptive response to low oxygen tension conditions. Even though the relevance of this signaling pathway has already been demonstrated in other microorganisms, its molecular activation mechanism has not yet been described in detail. In this article, we report the first crystal structures from different conformations of the NtrX receiver domain from B. abortus, and we propose a sequence of events to explain the structural rearrangements along the activation process. The analysis of the structures obtained in the presence of the phosphoryl group analog beryllofluoride led us to postulate that changes in the interface formed by the alpha4 helix and the beta5 strand are important for the activation, producing a reorientation of the alpha5 helix. Also, a biochemical characterization of the NtrX receiver domain enzymatic activities was performed, describing its autophosphorylation and autodephosphorylation kinetics. Finally, the role of H85, an important residue, was addressed by site-directed mutagenesis. Overall, these results provide significant structural basis for understanding the response regulator activation in this bacterial two-component system. Snapshots of Conformational Changes Shed Light into the NtrX Receiver Domain Signal Transduction Mechanism.,Fernandez I, Otero LH, Klinke S, Carrica MD, Goldbaum FA J Mol Biol. 2015 Jun 23. pii: S0022-2836(15)00350-2. doi:, 10.1016/j.jmb.2015.06.010. PMID:26113057 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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