6be0

AvrA delL154 with IP6, CoA

spinqualitylabelsall models 6be0, resolution 2.44Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6be0 is a 1 chain structure with sequence from Salmonella enterica subsp. enterica serovar Typhimurium str. ST4/74. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.438Å Ligands: COA, IHP Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function E8XKZ3_SALT4 Publication Abstract from PubMed Bacterial effector proteins are essential for the infection and proliferation of pathogenic bacteria through manipulation of host immune response pathways. AvrA is a Salmonella effector belonging to the YopJ family of acetyltransferases, which suppresses c-JUN N-terminal kinase (JNK) signaling in mammals through acetylation of mitogen activated receptor kinase kinase 4/7 (MKK4/7). Interestingly, two paralogues of AvrA exist that differ by only a single internal leucine residue, which when absent (AvrAL140), abrogates the ability to suppress JNK signaling. Here, we present the first crystal structure of a bacterial effector from an animal pathogen, AvrAL140, accompanied by a thorough biophysical characterization of both AvrA variants. The structure in complex with inositol hexaphosphate and coenzyme A reveals two closely associated domains consisting of a catalytic core that resembles the CE clan peptidases, and a wedge-shaped regulatory region that mediates co-factor and substrate binding. The loss of the putative function of AvrAL140 is due to its inability to interact with MKK4/7, which ultimately arises from an altered conformation of a critical helix adjacent to the active site, that harbors L140. These results provide general insights into substrate recognition across the YopJ family of acetyltransferases. Structural analysis of the bacterial effector, AvrA, identifies a critical helix involved in MKK4-substrate recognition.,Labriola J, Zhou Y, Nagar B Biochemistry. 2018 Jul 19. doi: 10.1021/acs.biochem.8b00512. PMID:30025209 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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