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National Academy of Sciences, Proceedings of the National Academy of Sciences, 35(106), p. 14831-14836, 2009

DOI: 10.1073/pnas.0900742106

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A luminal flavoprotein in endoplasmic reticulum-associated degradation

Journal article published in 2009 by Jan Riemer, Christian Appenzeller-Herzog ORCID, Linda Johansson, Bernd Bodenmiller, Rasmus Hartmann-Petersen, Lars Ellgaard ORCID
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

The quality control system of the endoplasmic reticulum (ER) discriminates between native and non-native proteins. The latter are degraded by the ER-associated degradation (ERAD) pathway. While many cytosolic and membrane components of this system are known, only few luminal players have been identified. In this study, we characterize ERFAD (ER Flavoprotein Associated with Degradation), a novel ER luminal flavoprotein that functions in ERAD. Upon knockdown of ERFAD, the degradation of the ERAD model substrate ribophorin 332 is delayed, and the overall level of polyubiquitinated cellular proteins is decreased. We also identify the ERAD components SEL1L, OS-9 and ERdj5, a known reductase of ERAD substrates, as interaction partners of ERFAD. Our data show that ERFAD facilitates the dislocation of certain ERAD substrates to the cytosol, and we discuss the findings in relation to a potential redox function of the protein.