4qnz

Crystal structure of rhomboid intramembrane protease GlpG F146I in complex with peptide derived inhibitor Ac-FATA-cmk

spinqualitylabelsall models 4qnz, resolution 2.55Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4qnz is a 2 chain structure with sequence from Escherichia coli str. K-12 substr. MC4100. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.55Å Ligands: 0QE, ACE, BNG, CL Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed The mechanisms of intramembrane proteases are incompletely understood due to the lack of structural data on substrate complexes. To gain insight into substrate binding by rhomboid proteases, we have synthesised a series of novel peptidyl-chloromethylketone (CMK) inhibitors and analysed their interactions with Escherichia coli rhomboid GlpG enzymologically and structurally. We show that peptidyl-CMKs derived from the natural rhomboid substrate TatA from bacterium Providencia stuartii bind GlpG in a substrate-like manner, and their co-crystal structures with GlpG reveal the S1 to S4 subsites of the protease. The S1 subsite is prominent and merges into the 'water retention site', suggesting intimate interplay between substrate binding, specificity and catalysis. Unexpectedly, the S4 subsite is plastically formed by residues of the L1 loop, an important but hitherto enigmatic feature of the rhomboid fold. We propose that the homologous region of members of the wider rhomboid-like protein superfamily may have similar substrate or client-protein binding function. Finally, using molecular dynamics, we generate a model of the Michaelis complex of the substrate bound in the active site of GlpG. Substrate binding and specificity of rhomboid intramembrane protease revealed by substrate-peptide complex structures.,Zoll S, Stanchev S, Began J, Skerle J, Lepsik M, Peclinovska L, Majer P, Strisovsky K EMBO J. 2014 Sep 12. pii: e201489367. PMID:25216680 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Rhomboid protease

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