4ACR

Crystal structure of N-glycosylated, C-terminally truncated human glypican-1

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.55 Å
  • R-Value Free: 0.292 
  • R-Value Work: 0.251 
  • R-Value Observed: 0.253 

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This is version 1.3 of the entry. See complete history. 


Literature

Crystal Structure of N-Glycosylated Human Glypican-1 Core Protein: Structure of Two Loops Evolutionarily Conserved in Vertebrate Glypican-1.

Svensson, G., Awad, W., Hakansson, M., Mani, K., Logan, D.T.

(2012) J Biol Chem 287: 14040

  • DOI: 10.1074/jbc.M111.322487
  • Primary Citation of Related Structures:  
    4ACR, 4AD7

  • PubMed Abstract: 

    • Glypicans are a family of cell-surface proteoglycans that regulate Wnt, hedgehog, bone morphogenetic protein, and fibroblast growth factor signaling. Loss-of-function mutations in glypican core proteins and in glycosaminoglycan-synthesizing enzymes h ...

    Glypicans are a family of cell-surface proteoglycans that regulate Wnt, hedgehog, bone morphogenetic protein, and fibroblast growth factor signaling. Loss-of-function mutations in glypican core proteins and in glycosaminoglycan-synthesizing enzymes have revealed that glypican core proteins and their glycosaminoglycan chains are important in shaping animal development. Glypican core proteins consist of a stable α-helical domain containing 14 conserved Cys residues followed by a glycosaminoglycan attachment domain that becomes exclusively substituted with heparan sulfate (HS) and presumably adopts a random coil conformation. Removal of the α-helical domain results in almost exclusive addition of the glycosaminoglycan chondroitin sulfate, suggesting that factors in the α-helical domain promote assembly of HS. Glypican-1 is involved in brain development and is one of six members of the vertebrate family of glypicans. We expressed and crystallized N-glycosylated human glypican-1 lacking HS and N-glycosylated glypican-1 lacking the HS attachment domain. The crystal structure of glypican-1 was solved using crystals of selenomethionine-labeled glypican-1 core protein lacking the HS domain. No additional electron density was observed for crystals of glypican-1 containing the HS attachment domain, and CD spectra of the two protein species were highly similar. The crystal structure of N-glycosylated human glypican-1 core protein at 2.5 Å, the first crystal structure of a vertebrate glypican, reveals the complete disulfide bond arrangement of the conserved Cys residues, and it also extends the structural knowledge of glypicans for one α-helix and two long loops. Importantly, the loops are evolutionarily conserved in vertebrate glypican-1, and one of them is involved in glycosaminoglycan class determination.

    Organizational Affiliation: 

    Department of Experimental Medical Science, Division of Neuroscience, Glycobiology Group, Lund University, Biomedical Center A13, SE-221 84 Lund, Sweden.



Macromolecules
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(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
GLYPICAN-1A, B, C, D478Homo sapiensMutation(s): 0 
Gene Names: GPC1
Find proteins for P35052 (Homo sapiens)
Explore P35052 
Go to UniProtKB:  P35052
NIH Common Fund Data Resources
PHAROS  P35052
GTEx  ENSG00000063660
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.55 Å
  • R-Value Free: 0.292 
  • R-Value Work: 0.251 
  • R-Value Observed: 0.253 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 47.17α = 90
b = 168.63β = 94.59
c = 147.76γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XSCALEdata scaling
Auto-Rickshawphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-02-22
    Type: Initial release
  • Version 1.1: 2012-05-02
    Changes: Other
  • Version 1.2: 2018-01-17
    Changes: Data collection
  • Version 1.3: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Data collection, Derived calculations, Other, Structure summary