Dolichyl-diphosphooligosaccharide–protein glycosyltransferase subunit DAD1 (DAD1)

DAD1 (Dolichyl-diphosphooligosaccharide–protein glycosyltransferase subunit DAD1) is a highly conserved, integral membrane protein that acts as a minor subunit of the oligosaccharyltransferase (OST) complex in the endoplasmic reticulum[1][4][6][7]. DAD1 is critical for N-linked glycosylation of proteins—a process essential for proper protein folding, stability, and cell function. DAD1 was first identified as a defender against apoptotic cell death and functions as a negative regulator of programmed cell death (apoptosis)[1][5][7]. Loss or knockout of DAD1 disrupts glycosylation, leading to ER stress, activation of unfolded protein response pathways, and apoptosis. While its mechanistic role in apoptosis suppression is still being elucidated, DAD1 holds strong disease relevance in cancer (where its amplification may support tumor survival), immunity, and development[1][3][5][7]. However, its essentiality for cell viability means direct therapeutic targeting is highly risky, and to date, no clinical drugs acting directly on DAD1 exist.

Other names

Defender against cell death 1Oligosaccharyl transferase subunit DAD1DAD-1OST2Oligosaccharyltransferase 2 homolog (S. cerevisiae)Oligosaccharyltransferase subunit 2 (non-catalytic)

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