5BUP

Crystal structure of the ZP-C domain of mouse ZP2

Summary for 5BUP

• Entry DOI: 10.2210/pdb5bup/pdb
• Descriptor: Zona pellucida sperm-binding protein 2, ACETATE ION (3 entities in total)
• Functional Keywords: sperm receptor, immunoglobulin-like domain, zona pellucida, zp domain, protein polymerization, cell adhesion
• Biological source: Mus musculus (House mouse)
• Cellular location: Processed zona pellucida sperm-binding protein 2: Secreted, extracellular space, extracellular matrix . Cell membrane ; Single-pass type I membrane protein : P20239
• Total number of polymer chains: 1
• Total formula weight: 24003.90

Authors

Nishimura, K.,Jovine, L. (deposition date: 2015-06-04, release date: 2016-01-27, Last modification date: 2024-10-23)

Primary citation

Bokhove, M.,Nishimura, K.,Brunati, M.,Han, L.,de Sanctis, D.,Rampoldi, L.,Jovine, L.
A structured interdomain linker directs self-polymerization of human uromodulin.
Proc.Natl.Acad.Sci.USA, 113:1552-1557, 2016

PubMed Abstract: Uromodulin (UMOD)/Tamm-Horsfall protein, the most abundant human urinary protein, plays a key role in chronic kidney diseases and is a promising therapeutic target for hypertension. Via its bipartite zona pellucida module (ZP-N/ZP-C), UMOD forms extracellular filaments that regulate kidney electrolyte balance and innate immunity, as well as protect against renal stones. Moreover, salt-dependent aggregation of UMOD filaments in the urine generates a soluble molecular net that captures uropathogenic bacteria and facilitates their clearance. Despite the functional importance of its homopolymers, no structural information is available on UMOD and how it self-assembles into filaments. Here, we report the crystal structures of polymerization regions of human UMOD and mouse ZP2, an essential sperm receptor protein that is structurally related to UMOD but forms heteropolymers. The structure of UMOD reveals that an extensive hydrophobic interface mediates ZP-N domain homodimerization. This arrangement is required for filament formation and is directed by an ordered ZP-N/ZP-C linker that is not observed in ZP2 but is conserved in the sequence of deafness/Crohn's disease-associated homopolymeric glycoproteins α-tectorin (TECTA) and glycoprotein 2 (GP2). Our data provide an example of how interdomain linker plasticity can modulate the function of structurally similar multidomain proteins. Moreover, the architecture of UMOD rationalizes numerous pathogenic mutations in both UMOD and TECTA genes.

PubMed: 26811476
DOI: 10.1073/pnas.1519803113

Experimental method

X-RAY DIFFRACTION (2.251 Å)