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Characterization of a REG/PA28 proteasome activator homolog in Dictyostelium discoideum indicates that the ubiquitin- and ATP-independent REGgamma proteasome is an ancient nuclear protease
Department of Molecular Biology, Swedish University of Agricultural Sciences (SLU), Uppsala Biomedical Center (BMC), Box 590, S-75124 Uppsala, Sweden .
2009 (English)In: Eukaryotic Cell, ISSN 1535-9778, E-ISSN 1535-9786, Vol. 8, no 6, 844-851 p.Article in journal (Refereed) Published
Abstract [en]

The nuclear proteasome activator REGgamma/PA28gamma is an ATP- and ubiquitin-independent activator of the 20S proteasome and has been proposed to degrade and thereby regulate both a key human oncogene, encoding the coactivator SRC-3/AIB1, and the cyclin-dependent kinase inhibitor p21 (Waf/Cip1). We report the identification and characterization of a PA28/REG homolog in Dictyostelium. Association of a recombinant Dictyostelium REG with the purified Dictyostelium 20S proteasome led to the preferential stimulation of the trypsin-like proteasome peptidase activity. Immunolocalization studies demonstrated that the proteasome activator is localized to the nucleus and is present in growing as well as starving Dictyostelium cells. Our results indicate that the Dictyostelium PA28/REG activator can stimulate both the trypsin-like and chymotrypsin-like activities of the 20S proteasome and supports the idea that the REGgamma-20S proteasome represents an early unique nuclear degradation pathway for eukaryotic cells.

Place, publisher, year, edition, pages
2009. Vol. 8, no 6, 844-851 p.
National Category
Cell Biology
URN: urn:nbn:se:uu:diva-198964DOI: 10.1128/EC.00165-08PubMedID: 19411624OAI: oai:DiVA.org:uu-198964DiVA: diva2:618784
Available from: 2013-04-30 Created: 2013-04-30 Last updated: 2013-07-23Bibliographically approved

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Söderbom, Fredrik
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