Download MendeleyTwo different, highly exposed, bulged structures for an unusually long peptide bound to rat MHC class I RT1-Aa.
Speir, J.A., Stevens, J., Joly, E., Butcher, G.W., Wilson, I.A.(2001) Immunity 14: 81-92
- PubMed: 11163232
- DOI: https://doi.org/10.1016/s1074-7613(01)00091-7
- Primary Citation of Related Structures:
1ED3 - PubMed Abstract:
The rat MHC class Ia molecule RT1-Aa has the unusual capacity to bind long peptides ending in arginine, such as MTF-E, a thirteen-residue, maternally transmitted minor histocompatibility antigen. The antigenic structure of MTF-E was unpredictable due to its extraordinary length and two arginines that could serve as potential anchor residues. The crystal structure of RT1-Aa-MTF-E at 2.55 A shows that both peptide termini are anchored, as in other class I molecules, but the central residues in two independent pMHC complexes adopt completely different bulged conformations based on local environment. The MTF-E epitope is fully exposed within the putative T cell receptor (TCR) footprint. The flexibility demonstrated by the MTF-E structures illustrates how different TCRs may be raised against chemically identical, but structurally dissimilar, pMHC complexes.
Organizational Affiliation:
Department of Molecular Biology and, Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA.
