Predicted to enable 2 iron, 2 sulfur cluster binding activity and ubiquinol-cytochrome-c reductase activity. Predicted to be located in membrane. Is an ortholog of C. elegans isp-1. In C. elegans, isp-1 is involved in mitochondrial electron transport, ubiquinol to cytochrome c; positive regulation of nematode larval development; and regulation of macromolecule metabolic process.