1csb
CRYSTAL STRUCTURE OF CATHEPSIN B INHIBITED WITH CA030 AT 2.1 ANGSTROMS RESOLUTION: A BASIS FOR THE DESIGN OF SPECIFIC EPOXYSUCCINYL INHIBITORS
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OverviewOverview
Crystals of cysteine protease human cathepsin B inhibited with CA030 (ethyl ester of epoxysuccinyl-Ile-Pro-OH) [Murata, M., et al. (1991) FEBS Lett. 280, 307-310; Towatari, T., et al. (1991) FEBS Lett. 280, 311-315] were isomorphous to a previous published structure of cathepsin B [Musil, D., et al. (1991) EMBO J. 10, 2321-2330]. The crystal structure of the complex was refined at 2.0-A resolution to an R-value of 0.194. CA030 is well-defined in the electron density. The Ile-Pro-OH part of CA030 mimics a substrate P1' and P2' residues. The structure thus reveals for the first time a substratelike interaction in the S1' and S2' sites of a papain-like cysteine protease. The CA030 ethyl ester group occupies the S2 site. The structure confirms the role of residues His 110 and His 111 as the receptors of a peptidic substrate C-terminal carboxylic group. The structure suggests that an epoxysuccinyl fragment can be used to extend binding into primed and nonprimed substrate binding sites of a papain-like cysteine protease.
About this StructureAbout this Structure
1CSB is a Single protein structure of sequence from Homo sapiens with as ligand. Active as Cathepsin B, with EC number 3.4.22.1 Full crystallographic information is available from OCA.
ReferenceReference
Crystal structure of cathepsin B inhibited with CA030 at 2.0-A resolution: A basis for the design of specific epoxysuccinyl inhibitors., Turk D, Podobnik M, Popovic T, Katunuma N, Bode W, Huber R, Turk V, Biochemistry. 1995 Apr 11;34(14):4791-7. PMID:7718586
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