From Microscopy to Nanoscopy: Contemporary Physical Methods in Mitochondrial Structural Biology.

Area of Science:

• Cell Biology
• Biophysics
• Biochemistry

Background:

• Mitochondria are vital for cellular energy, signaling, and metabolism.
• Classical methods limit understanding of mitochondrial proton transfer, membrane curvature effects on oxidative phosphorylation, and enzyme supercomplex organization.

Purpose of the Study:

• To systematically review contemporary physical methods for investigating mitochondrial structure and function at micro and nano scales.
• To highlight how these methods overcome limitations of traditional biochemical approaches.

Main Methods:

• Advanced fluorescence and super-resolution microscopy
• Electron and volume electron microscopy
• Scanning probe techniques
• Cryo-electron tomography
• Fluorescent probes, expansion and phase microscopy
• Machine-learning-based image analysis
• Raman spectroscopy, NMR, X-ray and neutron scattering

Main Results:

• These physical methods enable high-resolution imaging and quantitative assessment of mitochondrial morphology, membrane potential, and dynamics in living systems.
• Spectroscopic and scattering techniques probe mitochondrial redox state, metabolite composition, and membrane organization.
• Integration of experimental data with computational frameworks facilitates model testing and technology development.

Conclusions:

• Contemporary physical methods provide unprecedented insights into mitochondrial mechanisms.
• Combining high-resolution data with computational analysis is key to advancing mitochondrial research and developing new biomedical technologies.