2ozo
From Proteopedia
| |||||||
| , resolution 2.600Å | |||||||
|---|---|---|---|---|---|---|---|
| Ligands: | and | ||||||
| Gene: | ZAP70, SRK (Homo sapiens) | ||||||
| Activity: | Non-specific protein-tyrosine kinase, with EC number 2.7.10.2 | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
Autoinhibited intact human ZAP-70
Contents |
Overview
ZAP-70, a cytoplasmic tyrosine kinase required for T cell antigen receptor signaling, is controlled by a regulatory segment that includes a tandem SH2 unit responsible for binding to immunoreceptor tyrosine-based activation motifs (ITAMs). The crystal structure of autoinhibited ZAP-70 reveals that the inactive kinase domain adopts a conformation similar to that of cyclin-dependent kinases and Src kinases. The autoinhibitory mechanism of ZAP-70 is, however, distinct and involves interactions between the regulatory segment and the hinge region of the kinase domain that reduce its flexibility. Two tyrosine residues in the SH2-kinase linker that activate ZAP-70 when phosphorylated are involved in aromatic-aromatic interactions that connect the linker to the kinase domain. These interactions are inconsistent with ITAM binding, suggesting that destabilization of this autoinhibited ZAP-70 conformation is the first step in kinase activation.
Disease
Known diseases associated with this structure: Selective T-cell defect OMIM:[176947]
About this Structure
2OZO is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.
Reference
Structural basis for the inhibition of tyrosine kinase activity of ZAP-70., Deindl S, Kadlecek TA, Brdicka T, Cao X, Weiss A, Kuriyan J, Cell. 2007 May 18;129(4):735-46. PMID:17512407
Page seeded by OCA on Thu Mar 20 18:06:39 2008
