Defender against cell death 1 (DAD1) (DAD1)

Defender against cell death 1 (DAD1) is a highly conserved protein that serves as an essential subunit of the oligosaccharyltransferase (OST) complex located in the endoplasmic reticulum [1, 2]. The OST complex is responsible for the N-linked glycosylation of nascent polypeptides, a critical post-translational modification for protein folding and stability [3]. DAD1 was initially identified for its role in preventing programmed cell death; its depletion or mutation triggers apoptosis in various cell lines [2, 4]. In the context of disease, DAD1 is often overexpressed in several types of cancer, such as hepatocellular carcinoma, where it may contribute to tumor cell survival and proliferation by maintaining glycosylation homeostasis and suppressing apoptotic pathways [5, 6]. While specific small-molecule inhibitors exclusively targeting DAD1 are not yet in clinical use, the OST complex as a whole is an area of active research for anti-cancer therapies, with compounds like NGI-1 showing efficacy in preclinical models [7]. Targeting DAD1 presents significant therapeutic challenges because it is an essential gene, and its systemic inhibition could lead to severe toxicity or embryonic lethality [1, 8]. Sources: [1] UniProt (P61803); [2] Nakashima et al. (1993) PMID: 7961739; [3] Sanjay et al. (1998) PMID: 9836615; [4] Kelleher & Gilmore (1997) PMID: 9334251; [5] Tanaka et al. (2001) PMID: 11350495; [6] NCBI Gene (1603); [7] Lopez-Samblas et al. (2016) PMID: 28619654; [8] Hong et al. (2000) PMID: 10849010.

Other names

DAD-1OST2Oligosaccharyltransferase complex subunit DAD1

Inhibition of the oligosaccharyltransferase (OST) complex to disrupt N-linked glycosylation and induce apoptosis in susceptible cells.