1kjm
From Proteopedia
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TAP-A-associated rat MHC class I molecule
Overview
Antigenic peptides are loaded onto class I MHC molecules in the, endoplasmic reticulum (ER) by a complex consisting of the MHC class I, heavy chain, beta(2)-microglobulin, calreticulin, tapasin, Erp57 (ER60), and the transporter associated with antigen processing (TAP). While most, mammalian species transport these peptides into the ER via a single allele, of TAP, rats have evolved different TAPs, TAP-A and TAP-B, that are, present in different inbred strains. Each TAP delivers a different, spectrum of peptides and is associated genetically with distinct subsets, of MHC class Ia alleles, but the molecular basis for the conservation (or, co-evolution) of the two transporter alleles is unknown. We have, determined the crystal structures of a representative of each MHC subset, viz RT1-A(a) and RT1-A1(c), in association with high-affinity nonamer, peptides. The structures reveal how the chemical properties of the two, different rat MHC F-pockets match those of the corresponding C termini of, the peptides, corroborating biochemical data on the rates of peptide-MHC, complex assembly. An unusual sequence in RT1-A1(c) leads to a major, deviation from the highly conserved beta(3)/alpha(1) loop (residues 40-59), conformation in mouse and human MHC class I structures. This loop change, contributes to profound changes in the shape of the A-pocket in the, peptide-binding groove and may explain the function of RT1-A1(c) as an, inhibitory natural killer cell ligand.
About this Structure
1KJM is a Protein complex structure of sequences from Rattus norvegicus with SO4 as ligand. Full crystallographic information is available from OCA.
Reference
Crystal structures of two rat MHC class Ia (RT1-A) molecules that are associated differentially with peptide transporter alleles TAP-A and TAP-B., Rudolph MG, Stevens J, Speir JA, Trowsdale J, Butcher GW, Joly E, Wilson IA, J Mol Biol. 2002 Dec 13;324(5):975-90. PMID:12470953
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