Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 6-mer - ABCDEF Pseudo Symmetry: Asymmetric - C1 
Pseudo Stoichiometry: Hetero 6-mer -A4BC 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 77152.53 
• Atom Count: 4938 
• Residue Count: 698 
• Unique protein chains: 6

1QFW

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

• DOI: 10.2210/pdb1QFW/pdb

• Classification: IMMUNE SYSTEM
• Organism(s): Homo sapiens, Mus musculus


• Deposited: 1999-04-15 Released: 2000-04-26 
• Deposition Author(s): Tegoni, M., Spinelli, S., Cambillau, C.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3.5 Å
• R-Value Free: 0.310 
• R-Value Work: 0.260 

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

• PubMed: 10373373 
• DOI: 10.1006/jmbi.1999.2845


• 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.

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Related Citations: 

• Crystal Structure of Human Chorionic Gonadotropin
  Lapthorn, A.J.,Isaac, N.W.
  (1994) Nature 369: 455
• Role of the Carbohydrate of Human Chorionic Gonadotropinn in the Mechanism of Hormone Action
  Moyle, W.R.,Bahl, O.P.,Mrz, L.
  (1975) J.Biol.Chem. 250: 9163
• Partially Deglycosylated Human Chorioganadotropin, Stabilized by Intersubunit Disulfide Bonds, Shows Full Bioactivity
  Heikoop, J.C.,Van Den Boogaart, P.,De Leeuw, R.,Rosej, U.M.,Mulders, W.M.,Grootenhuis, P.D.J.
  (1998) Eur.J.Biochem. 253: 354
• Structure of Human Chorionic Gonadotropin at 2.6 Resolution from MAD Analysis of the Selenomethionyl Protein
  Wu, H.,Lustbader, J.W.,Liu, Y.,Canfield, R.E.,Hendrikson, W.A.
  (1994) Structure 2: 545
• Site Specificity of the Chorionic Gonadotropin N-Linked Oligosaccharides in Signal Transduction
  Matzuk, M.M.,Keene, J.L.,Boime, I.
  (1989) J.Biol.Chem. 264: 2409
• Crystallization and Characterization of Human Chorionic Gonadotropin in Chemically Deglycosylated and Enzymatically Desialylated States
  Hendrickson, W.A.,Canfield, R.E.
  (1989) Biochemistry 28: 9239




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Organizational Affiliation: 

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

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
GONADOTROPIN ALPHA SUBUNIT	A	92	Homo sapiens	Gene Names: CGA
Find proteins for P01215 (Homo sapiens) Go to Gene View: CGA Go to UniProtKB:  P01215

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details
GONADOTROPHIN BETA SUBUNIT	B	145	Homo sapiens	Gene Names: CGB3, CGB5, CGB8 (CGB)
Find proteins for P0DN86 (Homo sapiens) Go to Gene View: CGB3 CGB5 CGB8 Go to UniProtKB:  P0DN86

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details
ANTIBODY (ANTI ALPHA SUBUNIT) (LIGHT CHAIN)	L	114	Mus musculus
Find proteins for P01660 (Mus musculus) Go to UniProtKB:  P01660

Entity ID: 4
Molecule	Chains	Sequence Length	Organism	Details
ANTIBODY (ANTI ALPHA SUBUNIT) (HEAVY CHAIN)	H	117	Mus musculus
Find proteins for P01750 (Mus musculus) Go to UniProtKB:  P01750

Entity ID: 5
Molecule	Chains	Sequence Length	Organism	Details
ANTIBODY (ANTI BETA SUBUNIT) (LIGHT CHAIN)	M	108	Mus musculus
Find proteins for P01660 (Mus musculus) Go to UniProtKB:  P01660

Entity ID: 6
Molecule	Chains	Sequence Length	Organism	Details
ANTIBODY (ANTI BETA SUBUNIT) (HEAVY CHAIN)	I	122	Mus musculus
Find proteins for P18526 (Mus musculus) Go to UniProtKB:  P18526

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
NAG	A	N-ACETYL-D-GLUCOSAMINE C8 H15 N O6 OVRNDRQMDRJTHS-FMDGEEDCSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 3.5 Å
• R-Value Free: 0.310 
• R-Value Work: 0.260 
• Space Group: P 3₁ 2 1

Unit Cell:

Length (Å)	Angle (°)
a = 104.900	α = 90.00
b = 104.900	β = 90.00
c = 150.100	γ = 120.00

Software Package:

Software Name	Purpose
AMoRE	phasing
SCALEPACK	data scaling
X-PLOR	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1999-04-15 
• Released Date: 2000-04-26 
• Deposition Author(s): Tegoni, M., Spinelli, S., Cambillau, C.

Revision History 

• Version 1.0: 2000-04-26
  Type: Initial release
• Version 1.1: 2008-04-26
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Non-polymer description, Version format compliance