Supplementary Material for: Down regulation of Endo-beta-N-acetylglucosaminidase in Caenorhabditis elegans improves stress adaptivity

Introduction: Endo-beta-N-acetylglucosaminidase (ENGASE) is one of the key enzymes involved in the structural and functional regulations of glycoproteins. Although its enzymatic activities and applications have been well studied in vitro, its biological function in vivo yet remains to be illustrated. In this study, the biological function of ENGASE in Caenorhabditis elegans (C. elegans) was explored in detail.
Methods: An Engase gene knockout in C. elegans (CeEng-1 or CeEngase) was constructed and subjected to a panel of phenotypical and glycomics analysis. In addition, in vitro and in vivo ENGASE inhibition assays were performed.
Results: Engase knockout worm’s adaptivity to environmental stresses (heat and osmotic) was significantly improved, and its longevity was also increased mildly. A clustered change in basement membrane proteins (e.g., LAM-1, LAM-2, and EPI-1) was illustrated by Nglycopeptide analysis, suggesting ENGASE is involved in a basement membrane-based stress regulation. Then, the heat stress phenotype was further supported by in vivo CeEngase knockdown assay and in vitro and in vivo small compound inhibitory assay of CeENGASE, indicating ENGASE is a potential drug target for stress management.
Conclusion: Engase is actively involved in a basement membrane-mediated stress adaptation, and could serve as a potential target for healthcare products.