8UF4
Crystal structure of wildtype dystroglycan proteolytic domain (juxtamembrane domain)
Summary for 8UF4
| Entry DOI | 10.2210/pdb8uf4/pdb |
| Descriptor | a-dystroglycan, Beta-dystroglycan, CALCIUM ION, ... (5 entities in total) |
| Functional Keywords | sea domain, mechanoreceptor, cell adhesion |
| Biological source | Homo sapiens (human) More |
| Total number of polymer chains | 4 |
| Total formula weight | 58018.08 |
| Authors | Anderson, M.J.M.,Shi, K.,Hayward, A.N.,Uhlens, C.,Evans III, R.L.,Grant, E.,Greenberg, L.,Aihara, H.,Gordon, W.R. (deposition date: 2023-10-03, release date: 2024-09-11, Last modification date: 2025-03-26) |
| Primary citation | Anderson, M.J.M.,Hayward, A.N.,Smiley, A.T.,Shi, K.,Pawlak, M.R.,Aird, E.J.,Grant, E.,Greenberg, L.,Aihara, H.,Evans 3rd, R.L.,Ulens, C.,Gordon, W.R. Molecular basis of proteolytic cleavage regulation by the extracellular matrix receptor dystroglycan. Structure, 32:1984-1996.e5, 2024 Cited by PubMed Abstract: The dystrophin-glycoprotein-complex (DGC), anchored by the transmembrane protein dystroglycan, functions to mechanically link the extracellular matrix and actin cytoskeleton. Breaking this connection is associated with diseases such as muscular dystrophy, yet cleavage of dystroglycan by matrix-metalloproteinases (MMPs) remains an understudied mechanism to disrupt the DGC. We determined the crystal structure of the membrane-adjacent domain (amino acids 491-722) of E. coli expressed human dystroglycan to understand MMP cleavage regulation. The structural model includes tandem immunoglobulin-like (IGL) and sperm/enterokinase/agrin-like (SEAL) domains, which support proteolysis in diverse receptors to facilitate mechanotransduction, membrane protection, and viral entry. The structure reveals a C-terminal extension that buries the MMP site by packing into a hydrophobic pocket, a unique mechanism of MMP cleavage regulation. We further demonstrate structure-guided and disease-associated mutations disrupt proteolytic regulation using a cell-surface proteolysis assay. Thus disrupted proteolysis is a potentially relevant mechanism for "breaking" the DGC link to contribute to disease pathogenesis. PubMed: 39305901DOI: 10.1016/j.str.2024.08.019 PDB entries with the same primary citation |
| Experimental method | X-RAY DIFFRACTION (2.43 Å) |
Structure validation
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