Catalysis of the reaction: fatty acid (C-16 or longer) + 2-C = fatty acid (C-16 or longer + 2-C)
1. GOC: tb
2. MetaCyc ICOSANOYL-COA-SYNTHASE-RXN3. Reactome: R-HSA-2046083 "Elongation of arachidonyl-CoA to docosatetraenoyl-CoA"
4. Reactome: R-HSA-2046088 "Elongation of stearidonoyl-CoA to eicosatetraenoyl-CoA"
5. Reactome: R-HSA-2046090 "Elongation of docosapentaenoyl-CoA to tetracosapentaenoyl-CoA"
6. Reactome: R-HSA-2046094 "Elongation of gamma-lenolenoyl-CoA to dihomo-gamma-lenolenoyl-CoA"
7. Reactome: R-HSA-2046095 "Elongation of docosatetraenoyl-CoA to tetracosatetraenoyl-CoA"
8. Reactome: R-HSA-2046100 "Elongation of eicosapentaenoyl-CoA to docosapentaenoyl-CoA"
9. Reactome: R-HSA-548800 "ELOVL1,2,3,5 elongate AA-CoA and Mal-CoA to 3ODCT-CoA"
10. Reactome: R-HSA-548814 "ELOVL3,6,7 elongate PALM-CoA and Mal-CoA to 3OOD-CoA"
11. Reactome: R-HSA-548815 "ELOVL7 elongates ICS-CoA and Mal-CoA to 3ODC-CoA"
12. Reactome: R-HSA-548830 "ELOVL1,4 elongate TCS-CoA and Mal-CoA to 3OHC-CoA"