10,12-Tricosadiynoic acid-CoA rapidly inhibits ACOX1 activity in a time- and concentration-dependent manner. The activity of ACOX1 decreases by nearly 95% after 5 min of incubation with 10 eq of 10,12-Tricosadiynoic acid-CoA. ACOX1 activity is inhibited only if free 10,12-Tricosadiynoic Acid is activated as the CoA thioester, the substrate form. Inhibition of ACOX1 by 10,12-Tricosadiynoic acid-CoA is irreversible. And the kinetics parameters KI and kinact are calculated to be 680 nm and 3.18 min, respectively.
10,12-Tricosadiynoic acid is the precursor of 10,12-Tricosadiynoic acid-CoA and is transformed into 10,12-Tricosadiynoic acid-CoA by peroxisomal very long chain acyl-CoA synthetase (VLACS) after entering into cells, and it inhibits ACOX1 in vivo.
10,12-Tricosadiynoic acid (500 nM) inhibits acyl-CoA oxidase-1 (ACOX1) activity. 10,12-Tricosadiynoic acid treatment abrogates the protective effect by Sirt5 siRNA.