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Second proteasome-related gene in the human MHC class II region.

Kelly A., Powis S.H., Glynne R., Radley E., Beck S., Trowsdale J.

Antgen processing involves the generation of peptides from cytosolic proteins and their transport into the endoplasmic reticulum where they associate with major histocompatibility complex (MHC) class I molecules. Two genes have been identified in the MHC class II region, RING4 and RING11 in humans, which are believed to encode the peptide transport proteins. Attention is now focused on how the transporters are provided with peptides. The proteasome, a large complex of subunits with multiple proteolytic activities, is a candidate for this function. Recently we reported a proteasome-related sequence, RING10, mapping between the transporter genes. Here we describe a second human proteasome-like gene, RING12, immediately centromeric of the RING4 locus. Therefore RING12, 4, 10 and 11 form a tightly linked cluster of interferon-inducible genes within the MHC with an essential role in antigen processing.

Nature 353:667-668(1991) [PubMed] [Europe PMC]

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