Defective processing and presentation of exogenous antigens in mutants with normal HLA class II genes

Elizabeth Mellins, Laura Smith, Benjamin Arp, Tom Cotner, Esteban Celis, Donald Pious

Research output: Contribution to journalArticle

218 Scopus citations


PRESENTATION of an exogenous protein antigen to helper (CD4+) T-lymphocytes by antigen presenting cells (APC) generally requires that the APCs degrade the native protein antigen into an immunogenic peptide, a process termed 'antigen processing', and that this peptide bind to a major histocompatibility complex (MHC) class II molecule1-3. The complex of peptide and MHC molecule on the APC surface provides the stimulatory ligand for the αβJ T cell receptor4. The intracellular pathways and molecular mechanisms involved in the generation of the peptide-MHC complex are not well understood. Here, we describe several mutant APCs which are altered in their ability to present native exogenous protein antigens but effectively present immunogenic peptides derived from these proteins. The lesions in these mutants are not in the class II structural genes, but they affect the conformation of mature class II dimers.

Original languageEnglish (US)
Pages (from-to)71-74
Number of pages4
Issue number6253
StatePublished - Jan 1 1990
Externally publishedYes


ASJC Scopus subject areas

  • General

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