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Letter

Nature Cell Biology 7, 999–1006 (1 October 2005) | doi:10.1038/ncb1299

Membrane-bound Ubx2 recruits Cdc48 to ubiquitin ligases and their substrates to ensure efficient ER-associated protein degradation

Christian Schuberth & Alexander Buchberger

Endoplasmic reticulum (ER)-associated protein degradation (ERAD) is a quality control system that removes misfolded proteins from the ER. ERAD substrates are channelled from the ER via a proteinacious pore to the cytosolic ubiquitin–proteasome system — a process involving dedicated ubiquitin ligases and the chaperone-like AAA ATPase Cdc48 (also known as p97).