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Updated: Oct 2, 2026

Real-time Live Imaging of T-cell Signaling Complex Formation
Published on: June 23, 2013
Coordination of three signaling enzymes by AKAP79, a mammalian scaffold protein
T M Klauck1, M C Faux, K Labudda
1Vollum Institute, Oregon Health Sciences University, Portland, 97201, USA.
Abstract:
Multivalent binding proteins, such as the yeast scaffold protein Sterile-5, coordinate the location of kinases by serving as platforms for the assembly of signaling units. Similarly, in mammalian cells the cyclic adenosine 3',5'-monophosphate-dependent protein kinase (PKA) and phosphatase 2B [calcineurin (CaN)] are complexed by an A kinase anchoring protein, AKAP79. Deletion analysis and binding studies demonstrate that a third enzyme, protein kinase C (PKC), binds AKAP79 at a site distinct from those bound by PKA or CaN. The subcellular distributions of PKC and AKAP79 were similar in neurons. Thus, AKAP79 appears to function as a scaffold protein for three multifunctional enzymes.
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