2XOW

Structure of GlpG in complex with a mechanism-based isocoumarin inhibitor

Summary for 2XOW

• Entry DOI: 10.2210/pdb2xow/pdb
• Related: 2IC8 2IRV 2XOV
• Descriptor: RHOMBOID PROTEASE GLPG, 5-AMINO-2-(2-METHOXY-2-OXOETHYL)BENZOIC ACID, nonyl beta-D-glucopyranoside, ... (4 entities in total)
• Functional Keywords: hydrolase, membrane protein, intramembrane protease
• Biological source: ESCHERICHIA COLI
• Total number of polymer chains: 1
• Total formula weight: 25325.54

Authors

Vinothkumar, K.R.,Strisovsky, K.,Andreeva, A.,Christova, Y.,Verhelst, S.,Freeman, M. (deposition date: 2010-08-24, release date: 2010-10-13, Last modification date: 2024-11-13)

Primary citation

Vinothkumar, K.R.,Strisovsky, K.,Andreeva, A.,Christova, Y.,Verhelst, S.,Freeman, M.
The Structural Basis for Catalysis and Substrate Specificity of a Rhomboid Protease
Embo J., 29:3797-, 2010

PubMed Abstract: Rhomboids are intramembrane proteases that use a catalytic dyad of serine and histidine for proteolysis. They are conserved in both prokaryotes and eukaryotes and regulate cellular processes as diverse as intercellular signalling, parasitic invasion of host cells, and mitochondrial morphology. Their widespread biological significance and consequent medical potential provides a strong incentive to understand the mechanism of these unusual enzymes for identification of specific inhibitors. In this study, we describe the structure of Escherichia coli rhomboid GlpG covalently bound to a mechanism-based isocoumarin inhibitor. We identify the position of the oxyanion hole, and the S₁- and S₂'-binding subsites of GlpG, which are the key determinants of substrate specificity. The inhibitor-bound structure suggests that subtle structural change is sufficient for catalysis, as opposed to large changes proposed from previous structures of unliganded GlpG. Using bound inhibitor as a template, we present a model for substrate binding at the active site and biochemically test its validity. This study provides a foundation for a structural explanation of rhomboid specificity and mechanism, and for inhibitor design.

PubMed: 20890268
DOI: 10.1038/EMBOJ.2010.243

Experimental method

X-RAY DIFFRACTION (2.09 Å)