The human GCOM1 complex gene interacts with the NMDA receptor and internexin-alpha

Area of Science:

• Neuroscience
• Molecular Biology
• Genetics

Background:

• The GCOM1 gene is known for roles in transcription and cardiac myocytes.
• Its functions within the central nervous system (CNS) remain largely uncharacterized.

Purpose of the Study:

• To investigate the CNS functions of the GCOM1 gene.
• To identify novel GCOM1 interacting proteins and pathways.

Main Methods:

• Cloning of human and rat brain cDNAs for GCOM1 combined (Gcom) proteins (Gcom15).
• Yeast two-hybrid (Y2H) screens to identify GCOM1 interacting genes (Gints).
• Co-expression in heterologous cells and co-immunoprecipitation (co-IP) assays.

Main Results:

• Identified novel 105-kDa Gcom15 proteins in human and rat brains.
• Discovered 27 novel Gints, including synaptic proteins implicated in neurologic diseases.
• Demonstrated Gcom15 interaction with the NR1 subunit of the NMDA receptor (NMDAR).
• Showed co-IP of GCOM1 proteins with internexin-alpha (INA), an NMDAR interactor.

Conclusions:

• GCOM1 plays a role in the CNS, interacting with the NMDAR.
• A novel GCOM1-GRIN1-INA interaction pathway suggests potential neuroprotective mechanisms.