5VYG

Crystal structure of hFA9 EGF repeat with O-glucose trisaccharide


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.212 
  • R-Value Observed: 0.214 

wwPDB Validation   3D Report Full Report


This is version 2.0 of the entry. See complete history


Literature

O-Glycosylation modulates the stability of epidermal growth factor-like repeats and thereby regulates Notch trafficking

Takeuchi, H.Yu, H.Hao, H.Takeuchi, M.Ito, A.Li, H.Haltiwanger, R.S.

(2017) J Biol Chem 292: 15964-15973

  • DOI: 10.1074/jbc.M117.800102
  • Primary Citation of Related Structures:  
    5VYG

  • 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 O -fucosyltransferase 2 (POFUT2) ...

    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 O -fucosyltransferase 2 (POFUT2). Epidermal growth factor-like (EGF) repeats are also small cysteine-rich protein motifs that can be O -glycosylated by several ER-localized enzymes, including protein O -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 POGLUT1 and POFUT1 in an additive manner. In vitro unfolding assays reveal that addition of O -glucose or O -fucose stabilizes a single EGF repeat and that addition of both O -glucose and O -fucose enhances stability in an additive manner. Finally, we solved the crystal structure of a single EGF repeat covalently modified by a full O -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 O -fucose and O -glucose glycans cooperatively stabilize individual EGF repeats through intramolecular interactions, thereby regulating Notch trafficking in cells.


    Organizational Affiliation

    the Department of Biochemistry and Cell Biology, Stony Brook University, Stony Brook, New York 11794.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Coagulation factor IXB [auth A], A [auth B], C50Homo sapiensMutation(s): 0 
Gene Names: F9
EC: 3.4.21.22
UniProt & NIH Common Fund Data Resources
Find proteins for P00740 (Homo sapiens)
Explore P00740 
Go to UniProtKB:  P00740
PHAROS:  P00740
Protein Feature View
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  • Reference Sequence
Oligosaccharides

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Entity ID: 2
MoleculeChainsChain Length2D DiagramGlycosylation3D Interactions
alpha-D-xylopyranose-(1-3)-alpha-D-xylopyranose-(1-3)-beta-D-glucopyranoseD, E, F3O-Glycosylation Oligosaccharides Interaction
Glycosylation Resources
GlyTouCan:  G41179DF
GlyCosmos:  G41179DF
GlyGen:  G41179DF
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

Download Ideal Coordinates CCD File 
G [auth B], H [auth B], I [auth C]CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.212 
  • R-Value Observed: 0.214 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 92.417α = 90
b = 46.84β = 92.58
c = 37.259γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
SCALAdata scaling
MOLREPphasing

Structure Validation

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Entry History 

Deposition Data

  • Deposited Date: 2017-05-25 
  • Released Date: 2017-08-09 
  • Deposition Author(s): Yu, H.J., Li, H.L.

Revision History  (Full details and data files)

  • Version 1.0: 2017-08-09
    Type: Initial release
  • Version 1.1: 2018-02-28
    Changes: Database references
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Atomic model, Data collection, Derived calculations, Non-polymer description, Structure summary