Control of Protein Oligomerization Symmetry by Metal Coordination: C2 and C3 Symmetrical Assemblies through CuII and NiII Coordination

Abstract

We describe the metal-dependent self-assembly of symmetrical protein homooligomers from protein building blocks that feature appropriately engineered metal-chelating motifs on their surfaces. Crystallographic studies indicate that the same four-helix-bundle protein construct, MBPC-1, can self-assemble into C₂ and C₃ symmetrical assemblies dictated by Cu^II and Ni^II coordination, respectively. The symmetry inherent in metal coordination can thus be directly applied to biological self-assembly.