PMID- 12663445 OWN - NLM STAT- MEDLINE DCOM- 20030912 LR - 20210206 IS - 0006-4971 (Print) IS - 0006-4971 (Linking) VI - 102 IP - 2 DP - 2003 Jul 15 TI - The minor histocompatibility antigen HA-3 arises from differential proteasome-mediated cleavage of the lymphoid blast crisis (Lbc) oncoprotein. PG - 621-9 AB - Minor histocompatibility (H) antigens crucially affect the outcome of human leukocyte antigen (HLA)-identical allogeneic stem cell transplantation (SCT). To understand the basis of alloimmune responses against minor H antigens, identification of minor H peptides and their antigenicity-determining mechanisms is essential. Here we report the identification of HA-3 and its encoding gene. The HA-3 peptide, VTEPGTAQY (HA-3T), is encoded by the lymphoid blast crisis (Lbc) oncogene. We thus show for the first time that a leukemia-associated oncogene can give rise to immunogenic T-cell epitopes that may have participated in antihost and antileukemic alloimmune responses. Genotypic analysis of HA-3- individuals revealed the allelic counterpart VMEPGTAQY (HA-3M). Despite the lack of T-cell recognition of HA-3- cells, the Thr-->Met substitution had only a modest effect on peptide binding to HLA-A1 and a minimal impact on recognition by T cells when added exogenously to target cells. This substitution did not influence transporter associated with antigen processing (TAP) transport, but, in contrast to the HA-3T peptide, HA-3M is destroyed by proteasome-mediated digestion. Thus, the immunogenicity of minor H antigens can result from proteasome-mediated destruction of the negative allelic peptide. FAU - Spierings, Eric AU - Spierings E AD - Department of Immunohematology and Blood Transfusion, Leiden University Medical Center, Leiden, The Netherlands. FAU - Brickner, Anthony G AU - Brickner AG FAU - Caldwell, Jennifer A AU - Caldwell JA FAU - Zegveld, Suzanne AU - Zegveld S FAU - Tatsis, Nia AU - Tatsis N FAU - Blokland, Els AU - Blokland E FAU - Pool, Jos AU - Pool J FAU - Pierce, Richard A AU - Pierce RA FAU - Mollah, Sahana AU - Mollah S FAU - Shabanowitz, Jeffrey AU - Shabanowitz J FAU - Eisenlohr, Laurence C AU - Eisenlohr LC FAU - van Veelen, Peter AU - van Veelen P FAU - Ossendorp, Ferry AU - Ossendorp F FAU - Hunt, Donald F AU - Hunt DF FAU - Goulmy, Els AU - Goulmy E FAU - Engelhard, Victor H AU - Engelhard VH LA - eng GR - AI 33993/AI/NIAID NIH HHS/United States GR - AI20963/AI/NIAID NIH HHS/United States GR - AI44134/AI/NIAID NIH HHS/United States PT - Comparative Study PT - Journal Article PT - Research Support, Non-U.S. Gov't PT - Research Support, U.S. Gov't, P.H.S. DEP - 20030327 PL - United States TA - Blood JT - Blood JID - 7603509 RN - 0 (A Kinase Anchor Proteins) RN - 0 (AKAP13 protein, human) RN - 0 (ATP Binding Cassette Transporter, Subfamily B, Member 2) RN - 0 (ATP-Binding Cassette Transporters) RN - 0 (Adaptor Proteins, Signal Transducing) RN - 0 (Epitopes, T-Lymphocyte) RN - 0 (HLA-A1 Antigen) RN - 0 (Minor Histocompatibility Antigens) RN - 0 (Multienzyme Complexes) RN - 0 (Protein Isoforms) RN - 0 (Proto-Oncogene Proteins) RN - 0 (TAP1 protein, human) RN - EC 3.4.22.- (Cysteine Endopeptidases) RN - EC 3.4.25.1 (Proteasome Endopeptidase Complex) SB - IM MH - A Kinase Anchor Proteins MH - ATP Binding Cassette Transporter, Subfamily B, Member 2 MH - ATP-Binding Cassette Transporters/metabolism MH - Acute Disease MH - Adaptor Proteins, Signal Transducing MH - Alleles MH - Amino Acid Sequence MH - Amino Acid Substitution MH - Antigen Presentation MH - CD8-Positive T-Lymphocytes/immunology MH - Clone Cells/immunology MH - Cysteine Endopeptidases/*metabolism MH - Epitopes, T-Lymphocyte/*genetics/immunology/metabolism MH - Female MH - Genotype MH - HLA-A1 Antigen/metabolism MH - Humans MH - Leukemia, Myeloid/immunology/therapy MH - Male MH - Minor Histocompatibility Antigens MH - Molecular Sequence Data MH - Multienzyme Complexes/*metabolism MH - Pedigree MH - Peripheral Blood Stem Cell Transplantation MH - Polymorphism, Genetic MH - Proteasome Endopeptidase Complex MH - Protein Isoforms/genetics/metabolism MH - *Protein Processing, Post-Translational MH - Proto-Oncogene Proteins/*genetics/metabolism MH - Sequence Alignment MH - Sequence Homology, Amino Acid EDAT- 2003/03/29 05:00 MHDA- 2003/09/13 05:00 CRDT- 2003/03/29 05:00 PHST- 2003/03/29 05:00 [pubmed] PHST- 2003/09/13 05:00 [medline] PHST- 2003/03/29 05:00 [entrez] AID - S0006-4971(20)44383-6 [pii] AID - 10.1182/blood-2003-01-0260 [doi] PST - ppublish SO - Blood. 2003 Jul 15;102(2):621-9. doi: 10.1182/blood-2003-01-0260. Epub 2003 Mar 27.