On the cross-regulation of protein tyrosine phosphatases and receptor tyrosine kinases in intracellular signaling.
Intracellular signaling proteins are very often regulated by site-specific phosphorylation. For example, growth factor receptors in eukaryotic cells contain intrinsic tyrosine kinase activity and use inter- and intra-molecular interactions to recruit and orient potential protein substrates for phosphorylation. Equally important in determining the magnitude and kinetics of such a response is protein dephosphorylation, catalysed by phosphatase enzymes. A growing body of evidence indicates that certain protein tyrosine phosphatases (PTPs), like tyrosine kinases, are affected by intermolecular interactions that alter the specific activity or localization of their catalytic domains. Using a detailed kinetic modeling framework, we theoretically explore the regulation of PTPs through their association with receptor tyrosine kinases, as noted for the Src homology 2-domain-containing PTPs, SHP-1 and -2. Receptor-PTP binding, in turn, is expected to influence the phosphorylation pattern of those receptors and proteins they associate with, and we show how PTPs might serve to co- or counter-regulate parallel pathways in a signaling network.
Department of Chemical Engineering, 113 Riddick Lab., Box 7905, North Carolina State University, Raleigh, NC 27695-7905, USA. jason.haugh@ncsu.edu
Jason M
JM
Haugh
Ian C
IC
Schneider
Jodee M
JM
Lewis
D000818:Animals; D002462:Cell Membrane / Q000378:metabolism*; D008954:Models, Biological; D010766:Phosphorylation; D017027:Protein Tyrosine Phosphatases / Q000378:metabolism*; D015398:Signal Transduction / Q000502:physiology*; D019061:src-Family Kinases / Q000378:metabolism*
D019061:src-Family Kinases; D017027:Protein Tyrosine Phosphatases