Defective human leukocyte antigen class I-associated antigen presentation caused by a novel beta2-microglobulin loss-of-function in melanoma cells

The Journal of Biological Chemistry
Chien-Chung ChangSoldano Ferrone

Abstract

The major histocompatibility complex class I molecules consist of three subunits, the 45-kDa heavy chain, the 12-kDa beta(2)-microglobulin (beta(2)m), and an approximately 8-9-residue antigenic peptide. Without beta(2)m, the major histocompatibility complex class I molecules cannot assemble, thereby abolishing their transport to the cell membrane and the subsequent recognition by antigen-specific T cells. Here we report a case of defective antigen presentation caused by the expression of a beta(2)m with a Cys-to-Trp substitution at position 25 (beta(2)m(C25W)). This substitution causes misfolding and degradation of beta(2)m(C25W) but does not result in complete lack of human leukocyte antigen (HLA) class I molecule expression on the surface of melanoma VMM5B cells. Despite HLA class I expression, VMM5B cells are not recognized by HLA class I-restricted, melanoma antigen-specific cytotoxic T lymphocytes even following loading with exogenous peptides or transduction with melanoma antigen-expressing viruses. Lysis of VMM5B cells is restored only following reconstitution with exogenous or endogenous wild-type beta(2)m protein. Together, our results indicate impairment of antigenic peptide presentation because of a dysfunctional bet...Continue Reading

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