1jf1

From Proteopedia

proteopedia linkproteopedia link

Template:STRUCTURE 1jf1

Crystal structure of HLA-A2*0201 in complex with a decameric altered peptide ligand from the MART-1/Melan-A

Overview

We have determined high-resolution crystal structures of the complexes of HLA-A2 molecules with two modified immunodominant peptides from the melanoma tumor-associated protein Melan-A/Melanoma Ag recognized by T cells-1. The two peptides, a decamer and nonamer with overlapping sequences (ELAGIGILTV and ALGIGILTV), are modified in the second residue to increase their affinity for HLA-A2. The modified decamer is more immunogenic than the natural peptide and a candidate for peptide-based melanoma immunotherapy. The crystal structures at 1.8 and 2.15 A resolution define the differences in binding modes of the modified peptides, including different clusters of water molecules that appear to stabilize the peptide-HLA interaction. The structures suggest both how the wild-type peptides would bind and how three categories of cytotoxic T lymphocytes with differing fine specificity might recognize the two peptides.

About this Structure

1JF1 is a Protein complex structure of sequences from Homo sapiens. Full crystallographic information is available from OCA.

Reference

Crystal structures of two closely related but antigenically distinct HLA-A2/melanocyte-melanoma tumor-antigen peptide complexes., Sliz P, Michielin O, Cerottini JC, Luescher I, Romero P, Karplus M, Wiley DC, J Immunol. 2001 Sep 15;167(6):3276-84. PMID:11544315 Page seeded by OCA on Fri May 2 21:08:44 2008