RGD Reference Report - Primary structures of two homologous subunits of PA28, a gamma-interferon-inducible protein activator of the 20S proteasome. - Rat Genome Database

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Primary structures of two homologous subunits of PA28, a gamma-interferon-inducible protein activator of the 20S proteasome.

Authors: Ahn, JY  Tanahashi, N  Akiyama, K  Hisamatsu, H  Noda, C  Tanaka, K  Chung, CH  Shibmara, N  Willy, PJ  Mott, JD 
Citation: Ahn JY, etal., FEBS Lett 1995 Jun 5;366(1):37-42.
RGD ID: 69948
Pubmed: PMID:7789512   (View Abstract at PubMed)

The primary structures of two proteins that comprise PA28, an activator of the 20S proteasome, have been determined by cDNA cloning and sequencing. These protein subunits, termed PA28 alpha and PA28 beta, are about 50% identical to one another and are highly conserved between rat and human. PA28 alpha and PA28 beta are homologous to a previously described protein, Ki antigen, whose function is unknown. PA28 alpha, but neither PA28 beta nor Ki antigen, contains a 'KEKE motif', which has been postulated to promote the binding of proteins having this structural feature. PA28 alpha and PA28 beta were coordinately regulated by gamma-interferon, which greatly induced mRNA levels of both proteins in cultured cells. The mRNA level of the Ki antigen also increased in response to gamma-interferon treatment, but the magnitude of the increase was less than that for the PA28s, and the effect was transient. These results demonstrate the existence of a new protein family, at least two of whose members are involved in proteasome activation. They also provide the basis for future structure/function studies of PA28 subunits and the determination of their relative physiological roles in the regulation of proteasome activity.

Objects referenced in this article
Gene PSME2 proteasome activator subunit 2 Homo sapiens
Gene Psme1 proteasome activator subunit 1 Rattus norvegicus
Gene Psme2 proteasome activator subunit 2 Rattus norvegicus

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