The human NDUFA3 gene codes for a subunit of Complex I of the cardiac chain is a catalyst that provides energy to drive many processes in heart cells such as energy storage molecules and is used to power many chemical reactions within the cardiac cell.
The human NDUFA3 gene codes for a subunit of Complex I of the respiratory chain, which transfers electrons from NADH to ubiquinone. However, NDUFA3 is an accessory subunit of the complex that is believed not to be involved in catalysis. 
