Response to Comment on "PDK1 Nucleates T Cell Receptor-Induced Signaling Complex for NF-
B Activation"
Ki-young Lee,
Jae-Hyuck Shim,
Matthew S. Hayden,
Jan-Schulze Luehrmann,
Sankar Ghosh*
In their comment, Gruber
et al. report constitutive phosphorylation
of protein kinase C

at threonine residue 538. However, they
fail to note that, consistent with our results, a number of
other groups have previously reported inducible phosphorylation
of Thr-538 in T cells. Although the physiological relevance
of this discrepancy is unclear, substantial differences in experimental
conditions and reagents may account for the conflicting observations.
Section of Immunology and Department of Molecular Biophysics and Biochemistry, Yale University School of Medicine, New Haven, CT 06520, USA.
* To whom correspondence should be addressed. E-mail: Sankar.ghosh{at}yale.edu