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Mol. Cell. Biol., 02 1996, 694-703, Vol 16, No. 2
D Parker, K Ferreri, T Nakajima, VJ LaMorte, R Evans, SC Koerber, C Hoeger and MR Montminy
We have characterized a phosphoserine binding domain in the coactivator
CREB-binding protein (CBP) which interacts with the protein kinase A-
phosphorylated, and hence activated, form of the cyclic AMP-responsive
factor CREB. The CREB binding domain, referred to as KIX, is alpha helical
and binds to an unstructured kinase-inducible domain in CREB following
phosphorylation of CREB at Ser-133. Phospho-Ser-133 forms direct contacts
with residues in KIX, and these contacts are further stabilized by
hydrophobic residues in the kinase-inducible domain which flank
phospho-Ser-133. Like the src homology 2 (SH2) domains which bind
phosphotyrosine-containing peptides, phosphoserine 133 appears to
coordinate with a single arginine residue (Arg-600) in KIX which is
conserved in the CBP-related protein P300. Since mutagenesis of Arg-600 to
Gln severely reduces CREB-CBP complex formation, our results demonstrate
that, as in the case of tyrosine kinase pathways, signal transduction
through serine/threonine kinase pathways may also require protein
interaction motifs which are capable of recognizing phosphorylated amino
acids.
Copyright © 1996, American Society for Microbiology
Phosphorylation of CREB at Ser-133 induces complex formation with CREB- binding protein via a direct mechanism
Clayton Foundation Laboratories for Peptide Biology, Salk Institute, La Jolla, California 92037, USA.
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