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-Structure paper
タイトル | Crystal structure of a soluble CD28-Fab complex. |
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ジャーナル・号・ページ | Nat Immunol, Vol. 6, Issue 3, Page 271-279, Year 2005 |
掲載日 | 2005年2月6日 |
著者 | Edward J Evans / Robert M Esnouf / Raquel Manso-Sancho / Robert J C Gilbert / John R James / Chao Yu / Janet A Fennelly / Cheryl Vowles / Thomas Hanke / Björn Walse / Thomas Hünig / Poul Sørensen / David I Stuart / Simon J Davis / |
PubMed 要旨 | Naive T cell activation requires signaling by the T cell receptor and by nonclonotypic cell surface receptors. The most important costimulatory protein is the monovalent homodimer CD28, which ...Naive T cell activation requires signaling by the T cell receptor and by nonclonotypic cell surface receptors. The most important costimulatory protein is the monovalent homodimer CD28, which interacts with CD80 and CD86 expressed on antigen-presenting cells. Here we present the crystal structure of a soluble form of CD28 in complex with the Fab fragment of a mitogenic antibody. Structural comparisons redefine the evolutionary relationships of CD28-related proteins, antigen receptors and adhesion molecules and account for the distinct ligand-binding and stoichiometric properties of CD28 and the related, inhibitory homodimer CTLA-4. Cryo-electron microscopy-based comparisons of complexes of CD28 with mitogenic and nonmitogenic antibodies place new constraints on models of antibody-induced receptor triggering. This work completes the initial structural characterization of the CD28-CTLA-4-CD80-CD86 signaling system. |
リンク | Nat Immunol / PubMed:15696168 |
手法 | EM (単粒子) / X線回折 |
解像度 | 2.7 - 28.0 Å |
構造データ | EMDB-1219: PDB-1yjd: |
化合物 | ChemComp-NAG: ChemComp-HOH: |
由来 |
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キーワード | IMMUNE SYSTEM/SIGNALING PROTEIN / IgSF / CD28 homodimer / IMMUNE SYSTEM-SIGNALING PROTEIN COMPLEX |