2ems

Crystal Structure Analysis of the radixin FERM domain complexed with adhesion molecule CD43

spinqualitylabelsall models 2ems, resolution 2.90Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2ems is a 2 chain structure with sequence from Lk3 transgenic mice. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Related: 2emt Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [RADI_MOUSE] Probably plays a crucial role in the binding of the barbed end of actin filaments to the plasma membrane. [LEUK_MOUSE] One of the major glycoproteins of thymocytes and T lymphocytes. Plays a role in the physicochemical properties of the T-cell surface and in lectin binding. Presents carbohydrate ligands to selectins. Has an extended rodlike structure that could protrude above the glycocalyx of the cell and allow multiple glycan chains to be accessible for binding. Is a counter-receptor for SN/Siglec-1. During T-cell activation is actively removed from the T-cell-APC (antigen-presenting cell) contact site thus suggesting a negative regulatory role in adaptive immune response. 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 CD43/leukosialin/sialophorin is the major adhesion molecule in most hematopoietic cells and belongs to the sialomucin superfamily. In leukocyte emigration and activation, the exclusion of CD43 from the immunological synapse is an essential step. While the exclusion requires binding of the cytoplasmic region to ERM (ezrin/radixin/moesin) proteins, the detailed specific nature of the interaction between CD43 and ERM proteins is obscure. We have characterized the conformational properties of the CD43 cytoplasmic region, consisting of 124 amino acid residues, by hydrodynamic and spectroscopic measurements. Sedimentation equilibrium and velocity studies of ultracentrifugation revealed that the CD43 cytoplasmic peptide exists in a monomeric and extended form in solution. The crystal structure of the complex between the radixin FERM (4.1 and ERM) domain and the CD43 juxtamembrane region peptide reveals that the nonpolar region of the peptide binds subdomain C of the FERM domain. CD43 lacks the Motif-1 sequence for FERM binding found in the FERM-intercellular adhesion molecule-2 complex but possesses two conserved leucine residues that dock into the hydrophobic pocket of subdomain C without forming a 3(10)-helix. The FERM-binding site on CD43 is overlapped with the functional nuclear localization signal sequence. Our structure suggests that regulation of ERM binding may be coupled with regulated intramembrane proteolysis of CD43 followed by the nuclear transfer of the cytoplasmic peptide. Structural basis of the cytoplasmic tail of adhesion molecule CD43 and its binding to ERM proteins.,Takai Y, Kitano K, Terawaki S, Maesaki R, Hakoshima T J Mol Biol. 2008 Sep 5;381(3):634-44. Epub 2008 Jun 7. PMID:18614175 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Radixin

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