Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Standalone Viewers  
Protein Workshop | Ligand Explorer

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 30406.27 
• Atom Count: 2095 
• Residue Count: 259 
• Unique protein chains: 2

2Q3Y

Ancestral Corticiod Receptor in Complex with DOC

• DOI: 10.2210/pdb2Q3Y/pdb

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


• Deposited: 2007-05-30 Released: 2007-09-04 
• Deposition Author(s): Ortlund, E.A., Bridgham, J.T., Redinbo, M.R., Thornton, J.W.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.4 Å
• R-Value Free: 0.240 
• R-Value Work: 0.196 

Literature

Crystal structure of an ancient protein: evolution by conformational epistasis

Ortlund, E.A., Bridgham, J.T., Redinbo, M.R., Thornton, J.W.

(2007) Science 317: 1544-1548

• PubMed: 17702911 
• DOI: 10.1126/science.1142819
• Primary Citation of Related Structures:  
  2Q1V, 2Q1H


• PubMed Abstract: 
  

The structural mechanisms by which proteins have evolved new functions are known only indirectly. We report x-ray crystal structures of a resurrected ancestral protein-the approximately 450 million-year-old precursor of vertebrate glucocorticoid (GR) and mineralocorticoid (MR) receptors. Using structural, phylogenetic, and functional analysis, we identify the specific set of historical mutations that recapitulate the evolution of GR's hormone specificity from an MR-like ancestor. These substitutions repositioned crucial residues to create new receptor-ligand and intraprotein contacts. Strong epistatic interactions occur because one substitution changes the conformational position of another site. "Permissive" mutations-substitutions of no immediate consequence, which stabilize specific elements of the protein and allow it to tolerate subsequent function-switching changes-played a major role in determining GR's evolutionary trajectory.

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Organizational Affiliation: 

Department of Chemistry, University of North Carolina, Chapel Hill, NC 27599, USA.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Ancestral Corticiod Receptor	A	249	N/A	Mutation(s): 0
Protein Feature View is not available: No corresponding UniProt sequence found.

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details
Nuclear receptor 0B2	B	10	Homo sapiens	Mutation(s): 0  Gene Names: NR0B2 (SHP)
Find proteins for Q15466 (Homo sapiens) Go to Gene View: NR0B2 Go to UniProtKB:  Q15466

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
GOL	A	GLYCEROL GLYCERIN; PROPANE-1,2,3-TRIOL C3 H8 O3 PEDCQBHIVMGVHV-UHFFFAOYSA-N
1CA	A	DESOXYCORTICOSTERONE 4-PREGNEN-21-OL-3,20-DIONE; DOC; 21-HYDROXYPROGESTERONE C21 H30 O3 ZESRJSPZRDMNHY-YFWFAHHUSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.4 Å
• R-Value Free: 0.240 
• R-Value Work: 0.196 
• Space Group: P 4₃ 2₁ 2

Unit Cell:

Length (Å)	Angle (°)
a = 78.995	α = 90.00
b = 78.995	β = 90.00
c = 112.467	γ = 90.00

Software Package:

Software Name	Purpose
CNS	refinement
Blu-Ice	data collection
HKL-2000	data reduction
HKL-2000	data scaling
PHASER	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2007-05-30 
• Released Date: 2007-09-04 
• Deposition Author(s): Ortlund, E.A., Bridgham, J.T., Redinbo, M.R., Thornton, J.W.

Revision History 

• Version 1.0: 2007-09-04
  Type: Initial release
• Version 1.1: 2011-07-13
  Type: Non-polymer description, Version format compliance