Abstract
Cryoelectron tomography is a method to image biological samples three-dimensionally at molecular resolution. This modality provides insights into intracellular processes in their physiological settings. Obtaining a high-quality sample for cryoelectron tomography on mitochondria, however, can be challenging. In this chapter, we describe the crucial steps from sample preparation to data acquisition enabling studies of mitochondrial translation in situ by cryoelectron tomography. We provide detailed protocols for yeast and human mitochondria preparations yielding a high concentration of intact mitochondrial vesicles on cryo-EM grids. In addition, we describe a workflow for particle identification and spatial mapping in context of the organelle.
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