ATPase activity of melanosomes in liver pigment cells of Rana esculenta L.

Abstract

Luminometric methods show that melanosomes in liver pigment cells of Rana esculenta L. have endogenous ATP and ATPase activity. The K_m value of ATPase is 0.42 × 10⁻⁸ mol/l at pH 7.0. Inhibition of ATPase by antimycin and by ouabain is not effective. In the presence of an excess of ADP and Pi, ATP synthesis was observed.