6TQK image
Entry Detail
PDB ID:
6TQK
EMDB ID:
Title:
Cryo-EM of native human uromodulin (UMOD)/Tamm-Horsfall protein (THP) filament.
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
2019-12-16
Release Date:
2020-11-04
Method Details:
Experimental Method:
Resolution:
3.35 Å
Aggregation State:
FILAMENT
Reconstruction Method:
HELICAL
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Uromodulin
Chain IDs:A, B, C
Chain Length:563
Number of Molecules:3
Biological Source:Homo sapiens
Ligand Molecules
Primary Citation

Abstact

Assembly of extracellular filaments and matrices mediating fundamental biological processes such as morphogenesis, hearing, fertilization, and antibacterial defense is driven by a ubiquitous polymerization module known as zona pellucida (ZP) "domain". Despite the conservation of this element from hydra to humans, no detailed information is available on the filamentous conformation of any ZP module protein. Here, we report a cryo-electron microscopy study of uromodulin (UMOD)/Tamm-Horsfall protein, the most abundant protein in human urine and an archetypal ZP module-containing molecule, in its mature homopolymeric state. UMOD forms a one-start helix with an unprecedented 180-degree twist between subunits enfolded by interdomain linkers that have completely reorganized as a result of propeptide dissociation. Lateral interaction between filaments in the urine generates sheets exposing a checkerboard of binding sites to capture uropathogenic bacteria, and UMOD-based models of heteromeric vertebrate egg coat filaments identify a common sperm-binding region at the interface between subunits.

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Primary Citation of related structures