Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

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

Macromolecule Content

• Total Structure Weight: 31.24 kDa 
• Atom Count: 2349 
• Modelled Residue Count: 265 
• Deposited Residue Count: 265 
• Unique protein chains: 2

2A3I

Structural and Biochemical Mechanisms for the Specificity of Hormone Binding and Coactivator Assembly by Mineralocorticoid Receptor

• DOI: 10.2210/pdb2A3I/pdb

• Classification: TRANSFERASE
• Organism(s): Homo sapiens
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): Yes 


• Deposited: 2005-06-24 Released: 2005-07-19 
• Deposition Author(s): Li, Y., Suino, K., Daugherty, J., Xu, H.E.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.95 Å
• R-Value Free: 0.253 
• R-Value Work: 0.222 
• R-Value Observed: 0.222 

Literature

Structural and biochemical mechanisms for the specificity of hormone binding and coactivator assembly by mineralocorticoid receptor

Li, Y., Suino, K., Daugherty, J., Xu, H.E.

(2005) Mol Cell 19: 367-380

• PubMed: 16061183 
• DOI: 10.1016/j.molcel.2005.06.026
• Primary Citation of Related Structures:  
  2A3I


• PubMed Abstract: 
  

Mineralocorticoid receptor (MR) controls sodium homeostasis and blood pressure through hormone binding and coactivator recruitment. Here, we report a 1.95 A crystal structure of the MR ligand binding domain containing a single C808S mutation bound to corticosterone and the fourth LXXLL motif of steroid receptor coactivator-1 (SRC1-4). Through a combination of biochemical and structural analyses, we demonstrate that SRC1-4 is the most potent MR binding motif and mutations that disrupt the MR/SRC1-4 interactions abolish the ability of the full-length SRC1 to coactivate MR. The structure also reveals a compact steroid binding pocket with a unique topology that is primarily defined by key residues of helices 6 and 7. Mutations swapping a single residue at position 848 from helix H7 between MR and glucocorticoid receptor (GR) switch their hormone specificity. Together, these findings provide critical insights into the molecular basis of hormone binding and coactivator recognition by MR and related steroid receptors.

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Organizational Affiliation: 

Laboratory of Structural Sciences, Van Andel Research Institute, 333 Bostwick Avenue, Grand Rapids, Michigan 49503, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Mineralocorticoid receptor	A	253	Homo sapiens	Mutation(s): 1  Gene Names: NR3C2, MCR, MLR
Find proteins for P08235 (Homo sapiens) Explore P08235  Go to UniProtKB:  P08235
NIH Common Fund Data Resources
PHAROS:  P08235 GTEx:  ENSG00000151623

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Nuclear receptor coactivator 1, residues 1430-1441	B	12	N/A	Mutation(s): 0  EC: 2.3.1.48
Find proteins for Q15788 (Homo sapiens) Explore Q15788  Go to UniProtKB:  Q15788
NIH Common Fund Data Resources
PHAROS:  Q15788 GTEx:  ENSG00000084676

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
C0R	C [auth A]	CORTICOSTERONE C21 H30 O4 OMFXVFTZEKFJBZ-HJTSIMOOSA-N

External Ligand Annotations
ID	Binding Affinity (Sequence Identity %)
C0R	Kd:  0.5   nM  BindingDB

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.95 Å
• R-Value Free: 0.253 
• R-Value Work: 0.222 
• R-Value Observed: 0.222 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 44.647	α = 90
b = 72.259	β = 90
c = 81.226	γ = 90

Software Package:

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

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2005-06-24 
• Released Date: 2005-07-19 
Deposition Author(s): Li, Y., Suino, K., Daugherty, J., Xu, H.E.

Revision History  

• Version 1.0: 2005-07-19
  Type: Initial release
  
• Version 1.1: 2008-04-30
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2017-10-11
  Changes: Refinement description