7UAI

Meprin alpha helix in complex with fetuin-B

Summary for 7UAI

• Entry DOI: 10.2210/pdb7uai/pdb
• EMDB information: 26419 26420 26421 26422 26423 26424 26426
• Descriptor: Meprin A subunit alpha, Fetuin-B, 2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose, ... (8 entities in total)
• Functional Keywords: metalloprotease, complex, helical, extracellular, oncoprotein
• Biological source: Homo sapiens (human); More
• Total number of polymer chains: 6
• Total formula weight: 364672.47

Authors

Bayly-Jones, C.,Lupton, C.J.,Fritz, C.,Schlenzig, D.,Whisstock, J.C. (deposition date: 2022-03-13, release date: 2022-11-02, Last modification date: 2024-10-23)

Primary citation

Bayly-Jones, C.,Lupton, C.J.,Fritz, C.,Venugopal, H.,Ramsbeck, D.,Wermann, M.,Jager, C.,de Marco, A.,Schilling, S.,Schlenzig, D.,Whisstock, J.C.
Helical ultrastructure of the metalloprotease meprin alpha in complex with a small molecule inhibitor.
Nat Commun, 13:6178-6178, 2022

PubMed Abstract: The zinc-dependent metalloprotease meprin α is predominantly expressed in the brush border membrane of proximal tubules in the kidney and enterocytes in the small intestine and colon. In normal tissue homeostasis meprin α performs key roles in inflammation, immunity, and extracellular matrix remodelling. Dysregulated meprin α is associated with acute kidney injury, sepsis, urinary tract infection, metastatic colorectal carcinoma, and inflammatory bowel disease. Accordingly, meprin α is the target of drug discovery programs. In contrast to meprin β, meprin α is secreted into the extracellular space, whereupon it oligomerises to form giant assemblies and is the largest extracellular protease identified to date (~6 MDa). Here, using cryo-electron microscopy, we determine the high-resolution structure of the zymogen and mature form of meprin α, as well as the structure of the active form in complex with a prototype small molecule inhibitor and human fetuin-B. Our data reveal that meprin α forms a giant, flexible, left-handed helical assembly of roughly 22 nm in diameter. We find that oligomerisation improves proteolytic and thermal stability but does not impact substrate specificity or enzymatic activity. Furthermore, structural comparison with meprin β reveal unique features of the active site of meprin α, and helical assembly more broadly.

PubMed: 36261433
DOI: 10.1038/s41467-022-33893-7

Experimental method

ELECTRON MICROSCOPY (2.8 Å)