5mmh

The X-Ray Structure of the Effector Domain of the Transcriptional Regulator AmpR of Pseudomonas aeruginosa

spinqualitylabelsall models 5mmh, resolution 2.20Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5mmh is a 4 chain structure with sequence from Pseae. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Gene: ampR, PA4109 (PSEAE) Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [AMPR_PSEAE] This protein is a positive regulator of gene expression of beta-lactamase (AmpC). Publication Abstract from PubMed A complex link exists between cell-wall recycling/repair and the manifestation of resistance to beta-lactam antibiotics in many Enterobacteriaceae and Pseudomonas aeruginosa. This process is mediated by specific cell-wall-derived muropeptide products. These muropeptides are internalized into the cytoplasm and bind to the transcriptional regulator AmpR, which controls the cytoplasmic events that lead to expression of beta-lactamase, an antibiotic-resistance determinant. The effector-binding domain (EBD) of AmpR was purified to homogeneity. We document that the EBD exists exclusively as a dimer, even at a concentration as low as 1 muM. The EBD binds to the suppressor ligand UDP-N-acetyl-beta-d-muramyl-l-Ala-gamma-d-Glu-meso-DAP-d-Ala-d-Ala and binds to two activator muropeptides, N-acetyl-beta-d-glucosamine-(1-->4)-1,6-anhydro-N-acetyl-beta-d-muramyl-l-Ala-gam ma-d-Glu-meso-DAP-d-Ala-d-Ala and 1,6-anhydro-N-acetyl-beta-d-muramyl-l-Ala-gamma-d-Glu-meso-DAP-d-Ala-d-Ala, as assessed by non-denaturing mass spectrometry. The EBD does not bind to 1,6-anhydro-N-acetyl-beta-d-muramyl-l-Ala-gamma-d-Glu-meso-DAP. This binding selectivity revises the dogma in the field. The crystal structure of the EBD dimer was solved to 2.2 A resolution. The EBD crystallizes in a "closed" conformation, in contrast to the "open" structure required to bind the muropeptides. Structural issues of this ligand recognition are addressed by molecular dynamics simulations, which reveal significant differences among the complexes with the effector molecules. Muropeptide Binding and the X-ray Structure of the Effector Domain of the Transcriptional Regulator AmpR of Pseudomonas aeruginosa.,Dik DA, Dominguez-Gil T, Lee M, Hesek D, Byun B, Fishovitz J, Boggess B, Hellman LM, Fisher JF, Hermoso JA, Mobashery S J Am Chem Soc. 2017 Jan 17. doi: 10.1021/jacs.6b12819. PMID:28079369 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Transcriptional activator

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