Role of plasma as activator and cofactor in phosphorylation catalyzed by protein kinase C

Jeong Hun Kang, Daisuke Asai, Jun Oishi, Kenji Kawamura, Riki Toita, Yuhua Jiang, Takeshi Mori, Takuro Niidome, Yoshiki Katayama

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


The purpose of this study was to investigate whether plasma can influence the phosphorylation of protein kinase C (PKC). Lysate samples were prepared from normal skin or melanoma tissue and were reacted with a PKC peptide substrate in the presence or absence of plasma. In normal skin tissue lysates, the phosphorylation rates were much lower than those in melanoma tissue lysates. However, the level of phosphorylated peptide was increased in both normal skin and melanoma tissue lysates if plasma was present. Phosphorylation rates in the samples taken from the centre of B16 melanoma tissue were lower than those in samples taken from the edge. Moreover, addition of activator and/or cofactors (diacylglycerol, phosphatidylserine and/or Ca2+) of PKC, or plasma to the lysates contaminated by plasma had no effect on phosphorylation rates for the peptide substrate. These results indicate that plasma can play a role of activator and cofactor for substrate phosphorylation.

Original languageEnglish
Pages (from-to)70-75
Number of pages6
JournalCell Biochemistry and Function
Issue number1
Publication statusPublished - Jan 1 2008

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Clinical Biochemistry
  • Cell Biology

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