Cytosolic Peptide: N-Glycanase (NGLY1)-from Basic Biology to Genetic Disorder, NGLY1 Deficiency.
NGLY1: The Peptide Cleanup Crew at the Heart of Protein Quality Control
Adv Exp Med Biol
by Fujihira H, Suzuki T
“Cytosolic Peptide: N-Glycanase (NGLY1)-from Basic Biology to Genetic Disorder, NGLY1 Deficiency. Fujihira H(1)(2), Suzuki T(3). Author information: (1)Glycometabolic Biochemistry Laboratory, Pioneering Research Institute, RIKEN, Saitama, Japan. haruhiko.fujihira@riken.jp. (2)Division of Glycobiologics, Juntendo University Graduate School of Medicine, Tokyo, Japan. haruhiko.fujihira@riken.jp. (3)Glycometabolic Biochemistry Laboratory, Pioneering Research Institute, RIKEN, Saitama, Japan. tsuzuki_gm@riken.jp. The cytosolic peptide:N-glycanase (PNGase, NGLY1 in mammals) is an enzyme that removes N-glycans from misfolded glycoproteins. NGLY1 contributes to cytosolic glycan degradation (non-lysosomal glycan degradation) and is one of the quality control systems for newly synthesized proteins, i.e., ER-associated degradation (ERAD). NGLY1 is also responsible for the activation of a transcription factor, NFE2L1, which participates in several stress responses, including regulation of proteasome subunit expression and oxidative stress. In 2012, NGLY1 deficiency, a human genetic disorder caused by the biallelic mutations in the NGLY1 gene, was discovered. Since then, research on the physiological functions of NGLY1 and the pathogenic mechanism of NGLY1 deficiency has expanded rapidly. Here, we will briefly overview the early history of NGLY1 research and then introduce its versatile functions. We will also provide mechanistic insights into the pathogenesis of NGLY1 deficiency based on studies using model animals, such as worms, flies, and rodents. © 2026. The Author(s), under exclusive license to Springer Nature Switzerland AG.”
NGLY1 isn’t a household name, but it’s a big deal in peptide research. This cytosolic enzyme—also known as peptide:N-glycanase or PNGase—acts as a molecular janitor, stripping N-glycans from misfolded glycoproteins. Why care? This is core to how cells clean up and recycle proteins that didn’t get built right the first time.
Researchers now see NGLY1 as a key player in ER-associated degradation (ERAD), a major quality control pathway. When proteins come off the assembly line in the endoplasmic reticulum, some just don’t cut it. NGLY1 helps tag these duds for demolition and recycling, keeping the whole system running smoothly.
But there’s more. NGLY1 also flips the switch for the transcription factor NFE2L1, which helps cells respond to stress. That includes ramping up proteasome production and dealing with oxidative hits. In short, NGLY1 isn’t just a passive cleaner—it’s plugged into the cell’s stress response and protein balance.
Things got real in 2012 when scientists identified NGLY1 deficiency, a genetic disorder caused by mutations in the NGLY1 gene. Since then, research has exploded, using animal models from worms to rodents to tease apart how this single enzyme impacts everything from protein turnover to cell survival.
Key takeaway: NGLY1 research highlights how essential peptide-modifying enzymes are—both for basic cell function and for understanding rare genetic disorders. If you want to see where the peptide field is going, keep an eye on NGLY1.
For a deeper dive into peptide systems and related discoveries, hit up the peptide research index. The next breakthrough could be just one enzyme away.
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