9cip

MicroED structure of the C11 cysteine protease clostripain

spinqualitylabelsall models 9cip, resolution 2.50Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 9cip is a 2 chain structure with sequence from Hathewaya histolytica. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Electron crystallography, Resolution 2.5Å Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function CLOS_HATHI Cysteine endopeptidase with strict specificity. Publication Abstract from PubMed Clostripain secreted from Clostridium histolyticum is the founding member of the C11 family of Clan CD cysteine peptidases, which is an important group of peptidases secreted by numerous bacteria. Clostripain is an arginine-specific endopeptidase. Because of its efficacy as a cysteine peptidase, it is widely used in laboratory settings. Despite its importance the structure of clostripain remains unsolved. Here we describe the first structure of an active form of C. histolyticum clostripain determined at 2.5 A resolution using microcrystal electron diffraction (MicroED). The structure was determined from a single nanocrystal after focused ion beam milling. The structure of clostripain shows a typical Clan CD alpha/beta/alpha sandwich architecture and the Cys231/His176 catalytic dyad in the active site. It has a large electronegative substrate binding pocket showing its ability to accommodate large and diverse substrates. A loop in the heavy chain formed between residues 452 and 457 is potentially important for substrate binding. In conclusion, this result demonstrates the importance of MicroED to determine the unknown structure of macromolecules such as clostripain, which can be further used as a platform to study substrate binding and design of potential inhibitors against this class of peptidases. MicroED structure of the C11 cysteine protease clostripain.,Ruma YN, Bu G, Hattne J, Gonen T J Struct Biol X. 2024 Jul 6;10:100107. doi: 10.1016/j.yjsbx.2024.100107. , eCollection 2024 Dec. PMID:39100863 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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