Protocol for engineering and validating a synthetic mitochondrial intermembrane bridge in mammalian cells

Area of Science:

• Mitochondrial biology
• Cellular communication
• Protein engineering

Background:

• Membrane contact sites are crucial for communication between cellular compartments.
• The mitochondrial contact site and cristae organizing system (MICOS) plays a key role in mitochondrial structure and function.
• Understanding MICOS function requires tools to probe intercompartmental interactions.

Purpose of the Study:

• To develop and validate a synthetic bridge connecting the inner and outer mitochondrial membranes.
• To support the function of the endogenous mitochondrial contact site and cristae organizing system (MICOS).
• To provide a tool for studying the MICOS complex and its associated proteins.

Main Methods:

• Engineering a chimeric protein, named MitoT.
• Stable expression of MitoT in cultured mammalian cells.
• Validation of the synthetic bridge's ability to support MICOS function.

Main Results:

• Successful engineering and stable expression of the MitoT chimeric protein.
• Demonstrated ability of MitoT to bridge the inner and outer mitochondrial membranes.
• Validation of the synthetic bridge's support for endogenous MICOS function.

Conclusions:

• The engineered synthetic bridge (MitoT) is a functional tool for studying mitochondrial membrane contact sites.
• This approach facilitates research into the MICOS complex and its associated proteins.
• The protocol offers a valuable method for investigating intercompartmental communication within mitochondria.