Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 21285.29 
• Atom Count: 1415 
• Residue Count: 189 
• Unique protein chains: 1

1LHU

CRYSTAL STRUCTURE OF THE N-TERMINAL LG-DOMAIN OF SHBG IN COMPLEX WITH ESTRADIOL

• DOI: 10.2210/pdb1LHU/pdb

• Classification: TRANSPORT PROTEIN
• Organism(s): Homo sapiens
• Expression System: Escherichia coli


• Deposited: 2002-04-17 Released: 2002-10-23 
• Deposition Author(s): Grishkovskaya, I., Avvakumov, G.V., Hammond, G.L., Catalano, M.G., Muller, Y.A.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.8 Å
• R-Value Free: 0.237 
• R-Value Work: 0.204 

Literature

Steroid Ligands Bind Human Sex Hormone-binding Globulin in Specific Orientations and Produce Distinct Changes in Protein Conformation

Grishkovskaya, I., Avvakumov, G.V., Hammond, G.L., Catalano, M., Muller, Y.A.

(2002) J.Biol.Chem. 277: 32086-32093

• PubMed: 12065592 
• DOI: 10.1074/jbc.M203999200
• Primary Citation of Related Structures:  
  1LHV, 1LHO, 1LHN


• PubMed Abstract: 
  

The amino-terminal laminin G-like domain of human sex hormone-binding globulin (SHBG) contains a single high affinity steroid-binding site. Crystal structures of this domain in complex with several different steroid ligands have revealed that estradiol occupies the SHBG steroid-binding site in an opposite orientation when compared with 5 alpha-dihydrotestosterone or C19 androgen metabolites (5 alpha-androstan-3 beta,17 beta-diol and 5 alpha-androstan-3 beta,17 alpha-diol) or the synthetic progestin levonorgestrel. Substitution of specific residues within the SHBG steroid-binding site confirmed that Ser(42) plays a key role in determining high affinity interactions by hydrogen bonding to functional groups at C3 of the androstanediols and levonorgestrel and the hydroxyl at C17 of estradiol. Among residues participating in the hydrogen bond network with hydroxy groups at C17 of C19 steroids or C3 of estradiol, Asp(65) appears to be the most important. The different binding mode of estradiol is associated with a difference in the position/orientation of residues (Leu(131) and Lys(134)) in the loop segment (Leu(131)-His(136)) that covers the steroid-binding site as well as others (Leu(171)-Lys(173) and Trp(84)) on the surface of human SHBG and may provide a basis for ligand-dependent interactions between SHBG and other macromolecules. These new crystal structures have also enabled us to construct a simple space-filling model that can be used to predict the characteristics of novel SHBG ligands.

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Organizational Affiliation: 

Forschungsgruppe Kristallographie, Max-Delbrück-Centrum für Molekulare Medizin, D-13092 Berlin, Germany.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
SEX HORMONE-BINDING GLOBULIN	A	189	Homo sapiens	Mutation(s): 0  Gene Names: SHBG
Find proteins for P04278 (Homo sapiens) Go to Gene View: SHBG Go to UniProtKB:  P04278

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
CA	A	CALCIUM ION Ca BHPQYMZQTOCNFJ-UHFFFAOYSA-N
EST	A	ESTRADIOL C18 H24 O2 VOXZDWNPVJITMN-ZBRFXRBCSA-N

External Ligand Annotations
ID	Binding Affinity (Sequence Identity %)
EST	Kd: 1.5 nM (100) BINDINGDB
EST	IC50: 50 nM (100) BINDINGDB
EST	Kd: 1.48 nM PDBBIND

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.8 Å
• R-Value Free: 0.237 
• R-Value Work: 0.204 
• Space Group: H 3 2

Unit Cell:

Length (Å)	Angle (°)
a = 103.638	α = 90.00
b = 103.638	β = 90.00
c = 84.492	γ = 120.00

Software Package:

Software Name	Purpose
MAR345	data collection
CNS	phasing
SCALEPACK	data scaling
CNS	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2002-04-17 
• Released Date: 2002-10-23 
• Deposition Author(s): Grishkovskaya, I., Avvakumov, G.V., Hammond, G.L., Catalano, M.G., Muller, Y.A.

Revision History 

• Version 1.0: 2002-10-23
  Type: Initial release
• Version 1.1: 2008-04-28
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance
• Version 1.3: 2017-10-11
  Type: Refinement description