1KDM

THE CRYSTAL STRUCTURE OF THE HUMAN SEX HORMONE-BINDING GLOBULIN (TETRAGONAL CRYSTAL FORM)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.35 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.193 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Resolution of a disordered region at the entrance of the human sex hormone-binding globulin steroid-binding site.

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

(2002) J.Mol.Biol. 318: 621-626

  • DOI: 10.1016/S0022-2836(02)00169-9
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The crystal structure of human sex hormone-binding globulin (SHBG) has revealed how 5alpha-dihydrotestosterone intercalates between the two seven-stranded beta-sheets of its amino-terminal laminin G-like domain. However, a region of disorder (residue ...

    The crystal structure of human sex hormone-binding globulin (SHBG) has revealed how 5alpha-dihydrotestosterone intercalates between the two seven-stranded beta-sheets of its amino-terminal laminin G-like domain. However, a region of disorder (residues 130 to 135 of SHBG) was identified together with a zinc-binding site in immediate proximity to the steroid. It has been important to resolve the structure of this region because previous studies have suggested that these residues may contribute to steroid binding directly. Here, we present the 2.35 A and 1.7 A crystal structures of the amino-terminal LG domain of SHBG obtained from a tetragonal crystal form and by EDTA-soaking of a trigonal crystal form, respectively. In both of these new structures, residues Pro130 to Arg135 are now clearly visible. Substitution of the two residues (Leu131Gly and Lys134Ala) pointing towards the steroid has shown that only Leu131 contributes significantly to steroid binding. Rather than covering the steroid-binding pocket in an extended conformation, a 3(10) helical turn is formed by residues Leu131 to Lys134 in this segment. Unfolding of this secondary structure element can either facilitate the entry of the steroids into the binding site or modulate the important contribution that Leu131 makes to steroid binding. A comparison with previous structures supports the concept that zinc binding re-orients the side-chain of His136, and this residue serves as a lever causing disorder within the loop structure between Pro130 and Arg135.


    Organizational Affiliation

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




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
sex hormone-binding globulin
A
177Homo sapiensMutation(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
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

Download SDF File 
Download CCD File 
A
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
DHT
Query on DHT

Download SDF File 
Download CCD File 
A
5-ALPHA-DIHYDROTESTOSTERONE
C19 H30 O2
NVKAWKQGWWIWPM-ABEVXSGRSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
DHTIC50: 3.8 nM (100) BINDINGDB
DHTKd: 0.2 nM (100) BINDINGDB
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.35 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.193 
  • Space Group: P 43 2 2
Unit Cell:
Length (Å)Angle (°)
a = 52.240α = 90.00
b = 52.240β = 90.00
c = 148.530γ = 90.00
Software Package:
Software NamePurpose
MARdata collection
REFMACrefinement
XDSdata scaling
XDSdata reduction
MARdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-05-15
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance