2ARJ
CD8alpha-alpha in complex with YTS 105.18 Fab
Summary for 2ARJ
| Entry DOI | 10.2210/pdb2arj/pdb |
| Related | 1AKJ 1BQH 1CD8 1NEZ 1Q69 |
| Descriptor | YTS 105.18 antigen binding region Light chain, YTS 105.18 antigen binding region Heavy chain, T-cell surface glycoprotein CD8 alpha chain, ... (4 entities in total) |
| Functional Keywords | protein-protein complex, antibody fab, immune system, immunoglobulin domain |
| Biological source | Mus musculus (house mouse) More |
| Cellular location | Membrane; Single-pass type I membrane protein: P01731 |
| Total number of polymer chains | 6 |
| Total formula weight | 120683.41 |
| Authors | Shore, D.A.,Teyton, L.,Dwek, R.A.,Rudd, P.M.,Wilson, I.A. (deposition date: 2005-08-19, release date: 2006-05-30, Last modification date: 2024-10-30) |
| Primary citation | Shore, D.A.,Teyton, L.,Dwek, R.A.,Rudd, P.M.,Wilson, I.A. Crystal structure of the TCR co-receptor CD8alphaalpha in complex with monoclonal antibody YTS 105.18 Fab fragment at 2.88 A resolution. J.Mol.Biol., 358:347-354, 2006 Cited by PubMed Abstract: The CD8 glycoprotein functions as an essential element in the control of T-cell selection, maturation and the TCR-mediated response to peptide antigen. CD8 is expressed as both heterodimeric CD8alphabeta and homodimeric CD8alphaalpha isoforms, which have distinct physiological roles and exhibit tissue-specific expression patterns. CD8alphaalpha has previously been crystallized in complex with class I pMHC and, more recently, with the mouse class Ib thymic leukemia antigen (TL). Here, we present the crystal structure of a soluble form of mouse CD8alphaalpha in complex with rat monoclonal antibody YTS 105.18 Fab fragment at 2.88 A resolution. YTS 105.18, which is commonly used in the blockade of CD8+ T-cell activation in response to peptide antigen, is specific for mouse CD8alpha. The YTS 105.18 Fab is one of only five rat IgG Fab structures to have been reported to date. Analysis of the YTS 105.18 Fab epitope on CD8alpha reveals that this antibody blocks CD8 activity by hydrogen bonding to residues that are critical for interaction with both class I pMHC and TL. Structural comparison of the liganded and unliganded forms of soluble CD8alphaalpha indicates that the mouse CD8alphaalpha immunoglobulin-domain dimer does not undergo significant structural alteration upon interaction either with class I pMHC or TL. PubMed: 16530222DOI: 10.1016/j.jmb.2006.02.016 PDB entries with the same primary citation |
| Experimental method | X-RAY DIFFRACTION (2.88 Å) |
Structure validation
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