Acidic Environment Induces Dimerization and Ligand Binding Site Collapse in the Vps10p Domain of Sortilin.Januliene, D., Andersen, J.L., Nielsen, J.A., Quistgaard, E.M., Hansen, M., Strandbygaard, D., Moeller, A., Petersen, C.M., Madsen, P., Thirup, S.S.
(2017) Structure 25: 1809-1819.e3
- PubMed: 29107483
- DOI: 10.1016/j.str.2017.09.015
- PubMed Abstract:
Sortilin is a neuronal receptor involved in transmembrane signaling, endocytosis, and intracellular sorting of proteins. It cycles through a number of cellular compartments where it encounters various acidic conditions. The crystal structure of the s ...
Sortilin is a neuronal receptor involved in transmembrane signaling, endocytosis, and intracellular sorting of proteins. It cycles through a number of cellular compartments where it encounters various acidic conditions. The crystal structure of the sortilin ectodomain has previously been determined at neutral pH. Here, we present the 3.5-Å resolution crystal structure of sortilin at pH 5.5, which represents an environment similar to that of late endosomes, where ligands are released. The structure reveals an overall distortion of the 10-bladed β-propeller domain. This distortion and specific conformational changes, caused by protonation of a number of histidine residues, render the currently known binding sites unavailable for ligand binding. Access to the binding sites is furthermore blocked by a reversible and pH-dependent formation of tight sortilin dimers, also confirmed by electron microscopy, size-exclusion chromatography, and mutational studies. This study reveals how sortilin binding sites are disrupted and explains pH-dependent ligand affinity.
MIND Centre, Department of Molecular Biology and Genetics, Aarhus University, 8000 Aarhus, Denmark; Department of Structural Biology, Max Planck Institute of Biophysics, 60438 Frankfurt am Main, Germany.