1QFW

TERNARY COMPLEX OF HUMAN CHORIONIC GONADOTROPIN WITH FV ANTI ALPHA SUBUNIT AND FV ANTI BETA SUBUNIT


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.50 Å
  • R-Value Free: 0.310 
  • R-Value Work: 0.260 
  • R-Value Observed: 0.260 

Starting Models: experimental
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This is version 1.6 of the entry. See complete history


Literature

Crystal structure of a ternary complex between human chorionic gonadotropin (hCG) and two Fv fragments specific for the alpha and beta-subunits.

Tegoni, M.Spinelli, S.Verhoeyen, M.Davis, P.Cambillau, C.

(1999) J Mol Biol 289: 1375-1385

  • DOI: https://doi.org/10.1006/jmbi.1999.2845
  • Primary Citation of Related Structures:  
    1QFW

  • PubMed Abstract: 

    Human chorionic gonadotropin (hCG), is a placental hormone which exerts its major effect by stimulating progesterone production, crucially sustaining the early weeks of pregnancy. Detection of hCG with specific monoclonal antibodies (mAbs) has become the chosen means for pregnancy diagnosis. We have used antibody Fv fragments derived from two high-affinity mAbs, one against the alpha and the other against the beta-hCG subunit to enable the crystallisation of intact or desialylated hCG. Crystals of a ternary complex composed of Fv anti-alpha/hCG/Fv anti-beta were found to diffract to 3.5 A resolution, and the structure was solved by molecular replacement. In the crystal, the two Fvs keep hCG as in a molecular cage, providing good protein-protein contacts and leaving enough space for the saccharides to be accommodated in the cell solvent. The two Fvs were found not to interact directly through their complementary-determining regions with the hCG saccharides, but only with the protein. The hCG structure in the ternary complex was very close to that of the HF partially deglycosylated hormone, thus indicating that neither the saccharides nor the Fvs had any substantial influence on hormone structure.


  • Organizational Affiliation

    Architecture et Fonction des Macromolécules Biologiques UPR 9039, CNRS, IFR1, 31 Chemin Joseph Aiguier, Marseille Cedex 20, 13402, France.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
GONADOTROPIN ALPHA SUBUNIT92Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for P01215 (Homo sapiens)
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PHAROS:  P01215
GTEx:  ENSG00000135346 
Entity Groups  
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UniProt GroupP01215
Glycosylation
Glycosylation Sites: 2Go to GlyGen: P01215-1
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
GONADOTROPHIN BETA SUBUNIT145Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
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PHAROS:  P0DN86
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
ANTIBODY (ANTI ALPHA SUBUNIT) (LIGHT CHAIN)C [auth L]114Mus musculusMutation(s): 0 
UniProt
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UniProt GroupP01660
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
ANTIBODY (ANTI ALPHA SUBUNIT) (HEAVY CHAIN)D [auth H]117Mus musculusMutation(s): 0 
UniProt
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UniProt GroupP01750
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Entity ID: 5
MoleculeChains Sequence LengthOrganismDetailsImage
ANTIBODY (ANTI BETA SUBUNIT) (LIGHT CHAIN)E [auth M]108Mus musculusMutation(s): 0 
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UniProt GroupP01660
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Entity ID: 6
MoleculeChains Sequence LengthOrganismDetailsImage
ANTIBODY (ANTI BETA SUBUNIT) (HEAVY CHAIN)F [auth I]122Mus musculusMutation(s): 0 
UniProt
Find proteins for P18526 (Mus musculus)
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UniProt GroupP18526
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.50 Å
  • R-Value Free: 0.310 
  • R-Value Work: 0.260 
  • R-Value Observed: 0.260 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 104.9α = 90
b = 104.9β = 90
c = 150.1γ = 120
Software Package:
Software NamePurpose
SCALEPACKdata scaling
AMoREphasing
X-PLORrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2000-04-26
    Type: Initial release
  • Version 1.1: 2008-04-26
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Non-polymer description, Version format compliance
  • Version 1.3: 2019-11-27
    Changes: Advisory, Database references, Derived calculations
  • Version 1.4: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Data collection, Derived calculations, Structure summary
  • Version 1.5: 2023-08-16
    Changes: Advisory, Data collection, Database references, Refinement description, Structure summary
  • Version 1.6: 2024-10-16
    Changes: Structure summary