Sep 15, 1989

Ethoxylated alcohol (Neodol-12) and other surfactants in the assay of protein kinase C

Biochimica Et Biophysica Acta
T F AbidiJ D Laskin

Abstract

Most commonly used surfactants were found to be inhibitors of partially purified rat brain protein kinase C at or above their critical micellar concentrations (CMC). These include sodium lauryl sulfate, deoxycholate, octyl glucoside, dodecyl trimethylammonium bromide, linear alkylbenzene sulfonate and Triton X-100. Several detergents, including the nonionic surfactants digitonin and Neodol-12 (ethoxylated alcohol), did not inhibit protein kinase C activity, even at concentrations greater than their CMC, while the anionic surfactant, AEOS-12 (ethoxylated alcohol sulfate), inhibited enzyme activity only slightly (less than 8%). Since these latter surfactants have little or no inhibitory effect on protein kinase C, they may be of value in solubilizing cells and tissues for the determination of enzyme activity in crude extracts. Among the detergents tested, sodium lauryl sulfate and linear alkylbenzene sulfonate significantly stimulated protein kinase C activity in the absence of phosphatidylserine and calcium. This was found to be dependent on the presence of histone in the protein kinase C assay. These detergents failed to stimulate protein kinase C activity when endogenous proteins in the partially purified rat brain extracts we...Continue Reading

  • References18
  • Citations4

References

  • References18
  • Citations4

Citations

Mentioned in this Paper

Alcohols
Structure-Activity Relationship
Neodol 25-9
August Rats
Brain
HeLa Cells
Phosphoproteins
Micelles
Cytoplasmic Matrix
Plasma Membrane

About this Paper

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