Abstract
Latent and spontaneously active forms of phosphorylase phosphatase were separated by heparin-Sepharose chromatography of rabbit liver extract. The latent enzyme had an absolute polycation (histone H1, polybrene) requirement for the activity assayed with phosphorylase a and phosphorylase kinase substrates. Ethanol treatment resulted in the activation of both phosphatases by dissociating of 150–180 kDa holoenzymes to 33–38 kDa catalytic subunits as judged by gel filtration. The latent and spontaneously active phosphatases were differentiated according to their abilities to dephosphorylate the α and the β subunits of phosphorylase kinase and sensitivities to inhibition by inhibitor-2 or heparin, and were classified as type-2A and type-1 phosphatases, respectively.
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