National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
P41GM136508
米国
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R35GM135175
米国
引用
ジャーナル: Proc Natl Acad Sci U S A / 年: 2020 タイトル: MicroED structure of lipid-embedded mammalian mitochondrial voltage-dependent anion channel. 著者: Michael W Martynowycz / Farha Khan / Johan Hattne / Jeff Abramson / Tamir Gonen / 要旨: A structure of the murine voltage-dependent anion channel (VDAC) was determined by microcrystal electron diffraction (MicroED). Microcrystals of an essential mutant of VDAC grew in a viscous bicelle ...A structure of the murine voltage-dependent anion channel (VDAC) was determined by microcrystal electron diffraction (MicroED). Microcrystals of an essential mutant of VDAC grew in a viscous bicelle suspension, making it unsuitable for conventional X-ray crystallography. Thin, plate-like crystals were identified using scanning-electron microscopy (SEM). Crystals were milled into thin lamellae using a focused-ion beam (FIB). MicroED data were collected from three crystal lamellae and merged for completeness. The refined structure revealed unmodeled densities between protein monomers, indicative of lipids that likely mediate contacts between the proteins in the crystal. This body of work demonstrates the effectiveness of milling membrane protein microcrystals grown in viscous media using a focused ion beam for subsequent structure determination by MicroED. This approach is well suited for samples that are intractable by X-ray crystallography. To our knowledge, the presented structure is a previously undescribed mutant of the membrane protein VDAC, crystallized in a lipid bicelle matrix and solved by MicroED.
Voltage-dependentanion-selectivechannelprotein1 / mVDAC1 / Outer mitochondrial membrane protein porin 1 / Plasmalemmal porin / Voltage-dependent ...mVDAC1 / Outer mitochondrial membrane protein porin 1 / Plasmalemmal porin / Voltage-dependent anion-selective channel protein 5 / mVDAC5