Lipid bilayer-bound conformation of an integral membrane beta barrel protein by multidimensional MAS NMR
 

Lipid bilayer-bound conformation of an integral membrane beta barrel protein by multidimensional MAS NMR

Abstract


The human voltage dependent anion channel 1 (VDAC) is a 32Â*kDa β-barrel integral membrane protein that controls the transport of ions across the outer mitochondrial membrane. Despite the determination of VDAC solution and diffraction structures, a structural basis for the mechanism of its function is not yet fully understood. Biophysical studies suggest VDAC requires a lipid bilayer to achieve full function, motivating the need for atomic resolution structural information of VDAC in a membrane environment. Here we report an essential step toward that goal: extensive assignments of backbone and side chain resonances for VDAC in DMPC lipid bilayers via magic angle spinning nuclear magnetic resonance (MAS NMR). VDAC reconstituted into DMPC lipid bilayers spontaneously forms two-dimensional lipid crystals, showing remarkable spectral resolution (0.5â??0.3Â*ppm for 13C line widths and