Rad23 provides a link between the Png1 deglycosylating enzyme and the 26 S proteasome in yeast
- PMID: 11259433
- DOI: 10.1074/jbc.M100826200
Rad23 provides a link between the Png1 deglycosylating enzyme and the 26 S proteasome in yeast
Abstract
In addition to a role in DNA repair events in yeast, several lines of evidence indicate that the Rad23 protein (Rad23p) may regulate the activity of the 26 S proteasome. We report evidence that a de-N-glycosylating enzyme, Png1p, may be involved in the proteasomal degradation pathway via its binding to Rad23p. Interaction of Rad23p and Png1p was first detected by two-hybrid screening, and this interaction in vivo was confirmed by biochemical analyses. The Png1p-Rad23p complex was shown to be distinct from the well established DNA repair complex, Rad4p-Rad23p. We propose a model in which Rad23p functions as an escort protein to link the 26 S proteasome with proteins such as Rad4p or Png1p to regulate their cellular activities.
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