Download MendeleyCrystal Structure of Arrestin-3 Reveals the Basis of the Difference in Receptor Binding Between Two Non-visual Subtypes.
Zhan, X., Gimenez, L.E., Gurevich, V.V., Spiller, B.W.(2011) J Mol Biol 406: 467-478
- PubMed: 21215759
- DOI: https://doi.org/10.1016/j.jmb.2010.12.034
- Primary Citation of Related Structures:
3P2D - PubMed Abstract:
Arrestins are multi-functional proteins that regulate signaling and trafficking of the majority of G protein-coupled receptors (GPCRs), as well as sub-cellular localization and activity of many other signaling proteins. We report the first crystal structure of arrestin-3, solved at 3.0 Å resolution. Arrestin-3 is an elongated two-domain molecule with overall fold and key inter-domain interactions that hold the free protein in the basal conformation similar to the other subtypes. Arrestin-3 is the least selective member of the family, binding a wide variety of GPCRs with high affinity and demonstrating lower preference for active phosphorylated forms of the receptors. In contrast to the other three arrestins, part of the receptor-binding surface in the arrestin-3 C-domain does not form a contiguous β-sheet, which is consistent with increased flexibility. By swapping the corresponding elements between arrestin-2 and arrestin-3 we show that the presence of this loose structure is correlated with reduced arrestin selectivity for activated receptors, consistent with a conformational change in this β-sheet upon receptor binding.
Organizational Affiliation:
Department of Pharmacology, Vanderbilt University, Nashville, TN 37232, USA.
