Use of a novel method to find substrates of protein kinase C delta identifies M2 pyruvate kinase

Int J Biochem Cell Biol. 2007;39(5):978-87. doi: 10.1016/j.biocel.2007.01.018. Epub 2007 Jan 24.

Abstract

Protein kinase C (PKC) family members have been implicated in numerous cellular processes. However, identifying the substrates of each PKC isozyme remains a challenge. Here, we describe a method using two-dimensional (2D) isoelectric focusing gel electrophoresis to identify substrates of delta PKC (deltaPKC) in MCF-7 breast carcinoma cells. We show that M2 pyruvate kinase is a substrate of deltaPKC, and further characterize the interaction between M2 pyruvate kinase and deltaPKC in MCF-7 cells by immunoprecipitation. deltaPKC activation in vitro or in cells did not appear to alter the enzyme activity or polymerization of M2 pyruvate kinase.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Amino Acid Sequence
  • Cell Line, Tumor
  • Chromatography, Gel
  • Electrophoresis, Gel, Two-Dimensional / methods
  • HSP27 Heat-Shock Proteins
  • Heat-Shock Proteins / chemistry
  • Heat-Shock Proteins / metabolism
  • Humans
  • Immunoprecipitation
  • Isoelectric Focusing / methods
  • Molecular Chaperones
  • Molecular Sequence Data
  • Neoplasm Proteins / chemistry
  • Neoplasm Proteins / metabolism
  • Phosphorylation
  • Protein Binding
  • Protein Kinase C-delta / chemistry
  • Protein Kinase C-delta / metabolism*
  • Pyruvate Kinase / chemistry
  • Pyruvate Kinase / metabolism*
  • Substrate Specificity

Substances

  • HSP27 Heat-Shock Proteins
  • HSPB1 protein, human
  • Heat-Shock Proteins
  • Molecular Chaperones
  • Neoplasm Proteins
  • Pyruvate Kinase
  • Protein Kinase C-delta