Asparagine-linked glycans (N-glycans) are crucial signals for protein folding, sorting, and endoplasmic reticulum (ER)-associated degradation (ERAD) in yeast and mammals.Although similar ERAD processes were reported in plants, little is known about their biochemical mechanisms, especially their relationships with N-glycans.Recently we showed two loss-of-function mutations in the Arabidopsis thaliana homolog of the yeast ALG12 and ALG9 result in transfer of incompletely assembled glycans to polypeptides.