1. Structural studies of neuropilin‐2 reveal a zinc ion binding site remote from the vascular endothelial growth factor binding pocket
- Author
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Tsai, Y.C.I., Fotinou, C., Rana, R., Yelland, T., Frankel, P., Zachary, I., and Djordjevic, S.
- Subjects
Vascular Endothelial Growth Factor A ,animal structures ,Binding Sites ,neuropilins ,vascular endothelial growth factor ,Sequence Homology, Amino Acid ,Protein Conformation ,zinc ,Original Articles ,respiratory system ,X‐ray crystallography ,Crystallography, X-Ray ,Neuropilin-2 ,embryonic structures ,cardiovascular system ,Humans ,Original Article ,sense organs ,Amino Acid Sequence ,signalling - Abstract
Neuropilin-2 is a transmembrane receptor involved in lymphangiogenesis and neuronal development. In adults, neuropilin-2 and its homologous protein neuropilin-1 have been implicated in cancers and infection. Molecular determinants of the ligand selectivity of neuropilins are poorly understood. We have identified and structurally characterized a zinc ion binding site on human neuropilin-2. The neuropilin-2-specific zinc ion binding site is located near the interface between domains b1 and b2 in the ectopic region of the protein, remote from the neuropilin binding site for its physiological ligand, i.e. vascular endothelial growth factor. We also present an X-ray crystal structure of the neuropilin-2 b1 domain in a complex with the C-terminal sub-domain of VEGF-A. Zn(2+) binding to neuropilin-2 destabilizes the protein structure but this effect was counteracted by heparin, suggesting that modifications by glycans and zinc in the extracellular matrix may affect functional neuropilin-2 ligand binding and signalling activity.
- Published
- 2016