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

Tanveer F. Abidi, Carol A. Faaland, Diana D. Scala, Linda D. Rhein, Jeffrey D. Laskin

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


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 were used as the substrate. Our results indicate that activity of protein kinase C can be modified by the conditions of the assay and by the detergents used to extract the enzyme.

Original languageEnglish (US)
Pages (from-to)362-368
Number of pages7
JournalBBA - General Subjects
Issue number3
StatePublished - Sep 15 1989

All Science Journal Classification (ASJC) codes

  • Biophysics
  • Biochemistry
  • Molecular Biology


  • Ethoxylated alcohol
  • Protein kinase C
  • Surfactant


Dive into the research topics of 'Ethoxylated alcohol (Neodol-12) and other surfactants in the assay of protein kinase C'. Together they form a unique fingerprint.

Cite this