PMID: 9189757Mar 1, 1997Paper

Molecular properties of the proteasome activator PA28 family proteins and gamma-interferon regulation

Genes to Cells : Devoted to Molecular & Cellular Mechanisms
N TanahashiK Tanaka

Abstract

Recent cDNA cloning of two homologous proteasome activators, PA28 alpha and PA28 beta, indicated the presence of a structurally related third protein, Ki antigen, but a functional relationship between Ki antigen and the two PA28 proteins is unknown. Accumulating evidence has implicated an important role for PA28 in the major histocompatibility complex (MHC) class I-restricted antigen processing pathway. Recently, an immunomodulatory cytokine gamma-interferon (gamma-IFN) was found to increase greatly the messages for PA28 alpha and PA28 beta, but not Ki antigen, in human cells. Ki antigen was co-immunoprecipitated with the 20S proteasome by anti-proteasome antibody, and associated reversibly with the 20S proteasome, as observed for PA28 alpha and PA28 beta. Therefore, Ki antigen was renamed PA28 gamma. Anti-PA28 gamma antibody, however, did not immunoprecipitate PA28 alpha and PA28 beta. gamma-IFN caused an almost complete loss of the PA28 gamma protein in cells without affecting its mRNA level, whereas the levels of both mRNA and protein for PA28 alpha and PA28 beta were coordinately upregulated by gamma-IFN. Finally we showed that the human chromosomal genes of PA28 alpha and PA28 gamma were located on 14q11.2 and 17q21.32-21....Continue Reading

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