Structural highlights
Function
[PLCG1_BOVIN] Mediates the production of the second messenger molecules diacylglycerol (DAG) and inositol 1,4,5-trisphosphate (IP3). Plays an important role in the regulation of intracellular signaling cascades. Becomes activated in response to ligand-mediated activation of receptor-type tyrosine kinases, such as PDGFRA, PDGFRB, FGFR1, FGFR2, FGFR3 and FGFR4. Plays a role in actin reorganization and cell migration (By similarity).
Evolutionary Conservation
Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.
Publication Abstract from PubMed
The protein-tyrosine kinase Syk couples immune recognition receptors to multiple signal transduction pathways, including the mobilization of calcium and the activation of NFAT. The ability of Syk to regulate signaling is influenced by its phosphorylation on tyrosine residues within the linker B region. The phosphorylation of both Y342 and Y346 is necessary for optimal signaling from the B cell receptor for antigen. The SH2 domains of multiple signaling proteins share the ability to bind this doubly phosphorylated site. The NMR structure of the C-terminal SH2 domain of PLCgamma (PLCC) bound to a doubly phosphorylated Syk peptide reveals a novel mode of phosphotyrosine recognition. PLCC undergoes extensive conformational changes upon binding to form a second phosphotyrosine-binding pocket in which pY346 is largely desolvated and stabilized through electrostatic interactions. The formation of the second binding pocket is distinct from other modes of phosphotyrosine recognition in SH2-protein association. The dependence of signaling on simultaneous phosphorylation of these two tyrosine residues offers a new mechanism to fine-tune the cellular response to external stimulation.
Structural basis for the requirement of two phosphotyrosine residues in signaling mediated by Syk tyrosine kinase.,Groesch TD, Zhou F, Mattila S, Geahlen RL, Post CB J Mol Biol. 2006 Mar 10;356(5):1222-36. Epub 2005 Dec 27. PMID:16410013[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Groesch TD, Zhou F, Mattila S, Geahlen RL, Post CB. Structural basis for the requirement of two phosphotyrosine residues in signaling mediated by Syk tyrosine kinase. J Mol Biol. 2006 Mar 10;356(5):1222-36. Epub 2005 Dec 27. PMID:16410013 doi:10.1016/j.jmb.2005.11.095
