5VYG
Crystal structure of hFA9 EGF repeat with O-glucose trisaccharide
Summary for 5VYG
| Entry DOI | 10.2210/pdb5vyg/pdb |
| Descriptor | Coagulation factor IX, alpha-D-xylopyranose-(1-3)-alpha-D-xylopyranose-(1-3)-beta-D-glucopyranose, CALCIUM ION, ... (4 entities in total) |
| Functional Keywords | notch regulation, egf repeat, glycosylation, transferase-hydrolase complex, transferase, hydrolase |
| Biological source | Homo sapiens (Human) |
| Total number of polymer chains | 3 |
| Total formula weight | 18584.08 |
| Authors | |
| Primary citation | Takeuchi, H.,Yu, H.,Hao, H.,Takeuchi, M.,Ito, A.,Li, H.,Haltiwanger, R.S. O-Glycosylation modulates the stability of epidermal growth factor-like repeats and thereby regulates Notch trafficking J. Biol. Chem., 292:15964-15973, 2017 Cited by PubMed Abstract: Glycosylation in the endoplasmic reticulum (ER) is closely associated with protein folding and quality control. We recently described a non-canonical ER quality control mechanism for folding of thrombospondin type 1 repeats by protein -fucosyltransferase 2 (POFUT2). Epidermal growth factor-like (EGF) repeats are also small cysteine-rich protein motifs that can be -glycosylated by several ER-localized enzymes, including protein -glucosyltransferase 1 (POGLUT1) and POFUT1. Both POGLUT1 and POFUT1 modify the Notch receptor on multiple EGF repeats and are essential for full Notch function. The fact that POGLUT1 and POFUT1 can distinguish between folded and unfolded EGF repeats raised the possibility that they participate in a quality control pathway for folding of EGF repeats in proteins such as Notch. Here, we demonstrate that cell-surface expression of endogenous Notch1 in HEK293T cells is dependent on the presence of and in an additive manner. unfolding assays reveal that addition of -glucose or -fucose stabilizes a single EGF repeat and that addition of both -glucose and -fucose enhances stability in an additive manner. Finally, we solved the crystal structure of a single EGF repeat covalently modified by a full -glucose trisaccharide at 2.2 Å resolution. The structure reveals that the glycan fills up a surface groove of the EGF with multiple contacts with the protein, providing a chemical basis for the stabilizing effects of the glycans. Taken together, this work suggests that -fucose and -glucose glycans cooperatively stabilize individual EGF repeats through intramolecular interactions, thereby regulating Notch trafficking in cells. PubMed: 28729422DOI: 10.1074/jbc.M117.800102 PDB entries with the same primary citation |
| Experimental method | X-RAY DIFFRACTION (2.2 Å) |
Structure validation
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