Identification of cGMP-Dependent protein kinase anchoring proteins (GKAPs)

Ngan K. Vo, Jessica M. Gettemy, Vincent M. Coghlan

Research output: Contribution to journalArticlepeer-review

44 Scopus citations


To promote both efficiency and selectivity, many protein kinases and phosphatases are maintained in specific subcellular microenvironments through their association with anchoring proteins. In this study, we describe a new class of proteins, called GKAPS, that specifically bind the Type II cGMP-dependent protein kinase (PKG). GKAPs were detected in rat aorta, brain, and intestine using a protein overlay technique. The PKG binding proteins were distinct from AKAPs, proteins known to bind the cAMP-dependent protein kinase (PKA). Furthermore, a synthetic peptide that blocks association of PKA with AKAPs did not affect the PKG-GKAP interaction. Deletion mutagenesis was used to map the GKAP binding determinants within PKG to the N-terminal regulatory region. While most GKAPs were tissue-specific, a ubiquitous PKG-binding protein was detected and identified as myosin. Analysis of myosin fragments revealed that PKG binds within Subfragment 2. The results define a novel class of anchoring proteins that may target PKG for specific functional roles.

Original languageEnglish (US)
Pages (from-to)831-835
Number of pages5
JournalBiochemical and Biophysical Research Communications
Issue number3
StatePublished - May 29 1998
Externally publishedYes

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology


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