6XRP
Crystal structure of GlpG in complex with peptide ketoamide inhibitor, Ac-RVWHA-ketoamide-phenylbutyl
Summary for 6XRP
Entry DOI | 10.2210/pdb6xrp/pdb |
Descriptor | Rhomboid protease GlpG, peptide ketoamide inhibitor, N-(4-phenylbutyl)formamide, ... (4 entities in total) |
Functional Keywords | glpg, rhomboid protease, hydrolase-hydrolase inhibitor complex, membrane protein, hydrolase/hydrolase inhibitor |
Biological source | Escherichia coli More |
Total number of polymer chains | 2 |
Total formula weight | 24734.23 |
Authors | |
Primary citation | Gandhi, S.,Baker, R.P.,Cho, S.,Stanchev, S.,Strisovsky, K.,Urban, S. Designed Parasite-Selective Rhomboid Inhibitors Block Invasion and Clear Blood-Stage Malaria. Cell Chem Biol, 27:1410-1424.e6, 2020 Cited by PubMed Abstract: Rhomboid intramembrane proteases regulate pathophysiological processes, but their targeting in a disease context has never been achieved. We decoded the atypical substrate specificity of malaria rhomboid PfROM4, but found, unexpectedly, that it results from "steric exclusion": PfROM4 and canonical rhomboid proteases cannot cleave each other's substrates due to reciprocal juxtamembrane steric clashes. Instead, we engineered an optimal sequence that enhanced proteolysis >10-fold, and solved high-resolution structures to discover that boronates enhance inhibition >100-fold. A peptide boronate modeled on our "super-substrate" carrying one "steric-excluding" residue inhibited PfROM4 but not human rhomboid proteolysis. We further screened a library to discover an orthogonal alpha-ketoamide that potently inhibited PfROM4 but not human rhomboid proteolysis. Despite the membrane-immersed target and rapid invasion, ultrastructural analysis revealed that single-dosing blood-stage malaria cultures blocked host-cell invasion and cleared parasitemia. These observations establish a strategy for designing parasite-selective rhomboid inhibitors and expose a druggable dependence on rhomboid proteolysis in non-motile parasites. PubMed: 32888502DOI: 10.1016/j.chembiol.2020.08.011 PDB entries with the same primary citation |
Experimental method | X-RAY DIFFRACTION (2.4 Å) |
Structure validation
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