Stimulation of cyclic adenosine 3′,5′-monophosphate-dependent protein kinase with brain gangliosides

Futoshi Arakane, Kohji Fukunaga, Mei Satake, Kohji Miyazaki, Hitoshi Okamura, Eishichi Miyamoto

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

The holoenzyme of cAMP-dependent protein kinase (cAMP-kinase) partially purified from the particulate fraction of rat brain was stimulated by gangliosides. Among various gangliosides tested, GM 1 was most potent, giving Ka value of 19.5 μM. The maximal activation of the kinase was obtained with 100 μM GM 1 using kemptide as substrate. Gangliosides inhibited the kinase activity of the catalytic subunit of cAMP-kinase. Of various substrates tested, the ganghoside-stimulated cAMP-kinase could phosphorylate microtubule-associated protein 2, synapsin I and myelin basic protein, but not histone H 1 and casein. The molecular mechanisms of the stimulatory effect of gangliosides were investigated. The kinase activated with GM 1 was inhibited by the addition of PKItide, a specific inhibitor for cAMP-kinase. However, GM 1 did not dissociate the holoenzyme into the catalytic and regulatory subunits and did not interfere with the binding ability of cAMP to the holoenzyme. These results suggest that the gangliosides can directly activate cAMP-kinase in a different manner from cAMP.

Original languageEnglish
Pages (from-to)187-193
Number of pages7
JournalNeurochemistry International
Volume26
Issue number2
DOIs
Publication statusPublished - 1995 Feb

ASJC Scopus subject areas

  • Cellular and Molecular Neuroscience
  • Cell Biology

Fingerprint Dive into the research topics of 'Stimulation of cyclic adenosine 3′,5′-monophosphate-dependent protein kinase with brain gangliosides'. Together they form a unique fingerprint.

  • Cite this