1993 Volume 16 Issue 10 Pages 956-959
Lignoceroyl-coenzyme A (CoA) ligase activity was detected in microsomal fractions from chicken liver in the presence of α-cyclodextrin as a solubilizing agent of lignoceric acid. Heptakis(2, 6-di-O-methyl)-β-cyclodextrin (dimethyl-β-cyclodextrin) and hexakis(2, 6-di-O-methyl)-α-cyclodextrin (dimethyl-α-cyclodextrin), among the cyclodextrins tested, were more effective than α-cyclodextrin as solubilizing agents. We have characterized lignoceroyl-CoA ligase activity in comparison with palmitoyl-CoA ligase activity. Lignoceroyl-CoA and palmitoyl-CoA ligase activities showed a similar dependency on CoA concentration. However, lignoceroyl-CoA ligase activity exhibited responses to the Mg2+ ion, adenosine triphosphate (ATP), ATP analogues (adenosine monophosphate (AMP) and adenosine diphosphate (ADP)), and heat treatment, which were distinctly different from the responses of palmitoyl-CoA ligase activity. These results are consistent with the idea that lignoceroyl-CoA and palmitoyl-CoA are synthesized by two different enzymes.