A third interferon-gamma-induced subunit exchange in the 20S proteasome

Item Type:	Article
Title:	A third interferon-gamma-induced subunit exchange in the 20S proteasome
Creators Name:	Groettrup, M. and Kraft, R. and Kostka, S. and Standera, S. and Stohwasser, R. and Kloetzel, P.M.
Abstract:	The 20S proteasome is a protease complex of functional importance for antigen processing. Two of the 14 proteasome subunits, delta and MB1, can be replaced by the major histocompatibility complex (MHC)-encoded and interferon-gamma (IFN-gamma)-inducible subunits LMP2 and LMP7, respectively. LMP2 and LMP7 alter the cleavage site specificity of the 20S proteasome and are required for the efficient generation of T cell epitopes from a number of viral proteins and for optimal MHC class I cell surface expression. We compared the 20S proteasome subunit pattern from IFN-gamma-induced and non-induced mouse fibroblasts on two-dimensional gels and identified a third subunit exchange by microsequencing: the non-MHC-encoded subunit MECL-1 is induced by IFN-gamma and replaces a sofar barely characterized beta subunit designated 'MC14'. In analogy to LMP2 and LMP7, MECL-1 may be functional in MHC class I-restricted antigen presentation.
Keywords:	Proteasome, Interferon-{gamma}, MECL-1, Antigen Presentation, Major Histocompatibility Complex, Animals, Mice
Source:	European Journal of Immunology
ISSN:	0014-2980
Publisher:	Wiley
Volume:	26
Number:	4
Page Range:	863-869
Date:	1 April 1996
Official Publication:	https://doi.org/10.1002/eji.1830260421
PubMed:	View item in PubMed

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