PMID- 16003466 OWN - NLM STAT- MEDLINE DCOM- 20051019 LR - 20181113 IS - 0093-7711 (Print) IS - 0093-7711 (Linking) VI - 57 IP - 6 DP - 2005 Jul TI - Classification of A1- and A24-supertype molecules by analysis of their MHC-peptide binding repertoires. PG - 393-408 AB - At the functional level, the majority of human leukocyte antigen (HLA) class I MHC variants can be classified into about ten different major groups, or supertypes, characterized by overlapping peptide binding motifs and repertoires. Previous studies have detailed the peptide binding specificity of the HLA A2, A3, B7, and B44 supertypes, and predicted, on the basis of MHC pocket structures, known motifs, or the sequence of T cell epitopes, the existence of the HLA A1 and A24 supertypes. Direct experimental validation of the A1 and A24 supertypes, however, has been lacking. In the current study, the peptide-binding repertoires and main anchor specificities of several common HLA A molecules (A*0101, A*2301, A*2402, A*2601, A*2902, and A*3002) predicted to be members of the A1 or A24 supertypes were analyzed and defined using single amino acid substituted peptides and a large peptide library. Based on the present findings, the A1 supertype includes A*0101, A*2601, A*2902, and A*3002, whereas the A24 supertype includes A*2301 and A*2402. Interestingly, A*2902 is associated with a motif and peptide binding repertoire that overlaps significantly with those of all of the A1- and A24-supertype molecules studied, representing-to our knowledge-the first report of significant cross-reactivity among molecules belonging to different supertypes. FAU - Sidney, John AU - Sidney J AD - La Jolla Institute for Allergy and Immunology, 3030 Bunker Hill St., Ste. 326, San Diego, CA, 92109, USA. alex@liai.org FAU - Southwood, Scott AU - Southwood S FAU - Sette, Alessandro AU - Sette A LA - eng GR - N01-AI-40023/AI/NIAID NIH HHS/United States GR - N01-AI-40024/AI/NIAID NIH HHS/United States PT - Journal Article PT - Research Support, N.I.H., Extramural PT - Research Support, U.S. Gov't, P.H.S. DEP - 20050708 PL - United States TA - Immunogenetics JT - Immunogenetics JID - 0420404 RN - 0 (HLA-A Antigens) RN - 0 (HLA-A1 Antigen) RN - 0 (HLA-A24 Antigen) RN - 0 (Peptides) SB - IM MH - Amino Acid Motifs MH - Amino Acid Sequence MH - Cross Reactions MH - HLA-A Antigens/*chemistry/*classification/metabolism MH - HLA-A1 Antigen/*chemistry/*classification/metabolism MH - HLA-A24 Antigen MH - Humans MH - Molecular Sequence Data MH - Peptides/chemistry/metabolism EDAT- 2005/07/09 09:00 MHDA- 2005/10/20 09:00 CRDT- 2005/07/09 09:00 PHST- 2005/02/04 00:00 [received] PHST- 2005/05/12 00:00 [accepted] PHST- 2005/07/09 09:00 [pubmed] PHST- 2005/10/20 09:00 [medline] PHST- 2005/07/09 09:00 [entrez] AID - 10.1007/s00251-005-0004-2 [doi] PST - ppublish SO - Immunogenetics. 2005 Jul;57(6):393-408. doi: 10.1007/s00251-005-0004-2. Epub 2005 Jul 8.