2RIW

The Reactive loop cleaved human Thyroxine Binding Globulin complexed with thyroxine


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.04 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.196 
  • R-Value Observed: 0.198 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Allosteric modulation of hormone release from thyroxine and corticosteroid-binding globulins

Qi, X.Loiseau, F.Chan, W.L.Yan, Y.Wei, Z.Milroy, L.G.Myers, R.M.Ley, S.V.Read, R.J.Carrell, R.W.Zhou, A.

(2011) J Biol Chem 286: 16163-16173

  • DOI: 10.1074/jbc.M110.171082
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • The release of hormones from thyroxine-binding globulin (TBG) and corticosteroid-binding globulin (CBG) is regulated by movement of the reactive center loop in and out of the β-sheet A of the molecule. To investigate how these changes are transmitted ...

    The release of hormones from thyroxine-binding globulin (TBG) and corticosteroid-binding globulin (CBG) is regulated by movement of the reactive center loop in and out of the β-sheet A of the molecule. To investigate how these changes are transmitted to the hormone-binding site, we developed a sensitive assay using a synthesized thyroxine fluorophore and solved the crystal structures of reactive loop cleaved TBG together with its complexes with thyroxine, the thyroxine fluorophores, furosemide, and mefenamic acid. Cleavage of the reactive loop results in its complete insertion into the β-sheet A and a substantial but incomplete decrease in binding affinity in both TBG and CBG. We show here that the direct interaction between residue Thr(342) of the reactive loop and Tyr(241) of the hormone binding site contributes to thyroxine binding and release following reactive loop insertion. However, a much larger effect occurs allosterically due to stretching of the connecting loop to the top of the D helix (hD), as confirmed in TBG with shortening of the loop by three residues, making it insensitive to the S-to-R transition. The transmission of the changes in the hD loop to the binding pocket is seen to involve coherent movements in the s2/3B loop linked to the hD loop by Lys(243), which is, in turn, linked to the s4/5B loop, flanking the thyroxine-binding site, by Arg(378). Overall, the coordinated movements of the reactive loop, hD, and the hormone binding site allow the allosteric regulation of hormone release, as with the modulation demonstrated here in response to changes in temperature.


    Organizational Affiliation

    Department of Biochemistry, Nanjing University, Nanjing, China.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Thyroxine-binding globulin
A
338Homo sapiensMutation(s): 0 
Gene Names: SERPINA7TBG
Find proteins for P05543 (Homo sapiens)
Go to UniProtKB:  P05543
NIH Common Fund Data Resources
PHAROS  P05543

Find similar proteins by: Sequence  |  Structure

Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Thyroxine-binding globulin
B
40Homo sapiensMutation(s): 0 
Gene Names: SERPINA7TBG
Find proteins for P05543 (Homo sapiens)
Go to UniProtKB:  P05543
NIH Common Fund Data Resources
PHAROS  P05543
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
T44
Query on T44

Download CCD File 
A
3,5,3',5'-TETRAIODO-L-THYRONINE
C15 H11 I4 N O4
XUIIKFGFIJCVMT-LBPRGKRZSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.04 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.196 
  • R-Value Observed: 0.198 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 173.594α = 90
b = 42.164β = 90
c = 55.98γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
ADSCdata collection
MOSFLMdata reduction
SCALAdata scaling
PHASERphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2008-10-14
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 1.2: 2013-01-16
    Changes: Database references