5N71
CRYSTAL STRUCTURE OF MATURE CATHEPSIN D FROM THE TICK IXODES RICINUS (IRCD1)
Summary for 5N71
| Entry DOI | 10.2210/pdb5n71/pdb |
| Related | 5N70 |
| Descriptor | Putative cathepsin d, SULFATE ION, DI(HYDROXYETHYL)ETHER, ... (4 entities in total) |
| Functional Keywords | hydrolase |
| Biological source | Ixodes ricinus (Common tick) |
| Total number of polymer chains | 1 |
| Total formula weight | 37817.30 |
| Authors | Brynda, J.,Hanova, I.,Hobizalova, R.,Mares, M. (deposition date: 2017-02-17, release date: 2017-12-27, Last modification date: 2024-11-13) |
| Primary citation | Hanova, I.,Brynda, J.,Houstecka, R.,Alam, N.,Sojka, D.,Kopacek, P.,Maresova, L.,Vondrasek, J.,Horn, M.,Schueler-Furman, O.,Mares, M. Novel Structural Mechanism of Allosteric Regulation of Aspartic Peptidases via an Evolutionarily Conserved Exosite. Cell Chem Biol, 25:318-329.e4, 2018 Cited by PubMed Abstract: Pepsin-family aspartic peptidases are biosynthesized as inactive zymogens in which the propeptide blocks the active site until its proteolytic removal upon enzyme activation. Here, we describe a novel dual regulatory function for the propeptide using a set of crystal structures of the parasite cathepsin D IrCD1. In the IrCD1 zymogen, intramolecular autoinhibition by the intact propeptide is mediated by an evolutionarily conserved exosite on the enzyme core. After activation, the mature enzyme employs the same exosite to rebind a small fragment derived from the cleaved propeptide. This fragment functions as an effective natural inhibitor of mature IrCD1 that operates in a pH-dependent manner through a unique allosteric inhibition mechanism. The study uncovers the propeptide-binding exosite as a target for the regulation of pepsin-family aspartic peptidases and defines the structural requirements for exosite inhibition. PubMed: 29396291DOI: 10.1016/j.chembiol.2018.01.001 PDB entries with the same primary citation |
| Experimental method | X-RAY DIFFRACTION (1.88 Å) |
Structure validation
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