Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 19521.73 
• Atom Count: 1362 
• Residue Count: 166 
• Unique protein chains: 1

1P2S

H-Ras 166 in 50% 2,2,2 triflouroethanol

• DOI: 10.2210/pdb1P2S/pdb

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


• Deposited: 2003-04-16 Released: 2003-08-05 
• Deposition Author(s): Buhrman, G.K., de Serrano, V., Mattos, C.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.45 Å
• R-Value Free: 0.230 
• R-Value Work: 0.188 

Literature

Organic Solvents Order the Dynamic Switch II in Ras Crystals

Buhrman, G.K., de Serrano, V., Mattos, C.

(2003) Structure 11: 747-751

• PubMed: 12842038 
• Primary Citation of Related Structures:  
  1P2V, 1P2U, 1P2T


• PubMed Abstract: 
  

Room temperature crystal structures of crosslinked H-Ras bound to GMPPNP were solved in 50% 2,2,2-trifluoroethanol, 60% 1,6-hexanediol, and 50% isopropanol. The disordered switch II region of Ras is ordered in the presence of 2,2,2-trifluoroethanol or 1,6-hexanediol. The overall backbone conformation of switch II in these organic solvents is the same as in the Ras-GMPPNP complexes with RalGDS, PI(3) kinase, and RasGAP, indicating a biologically relevant form. Key polar interactions that stabilize the ordered switch are enhanced in the presence of hydrophobic cosolvents. These results suggest that hydrophobic solvents can be used in general to order short biologically relevant segments of disordered regions in protein crystals by favoring H-bonding interactions between atoms that are highly solvated and mobile in aqueous solution.

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Organizational Affiliation: 

Department of Molecular and Structural Biochemistry, North Carolina State University, 128 Polk Hall, Raleigh, NC 27695, USA.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Transforming protein p21/H-RAS-1	A	166	Homo sapiens	Mutation(s): 0  Gene Names: HRAS (HRAS1)
Find proteins for P01112 (Homo sapiens) Go to Gene View: HRAS Go to UniProtKB:  P01112

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
ETF	A	TRIFLUOROETHANOL C2 H3 F3 O RHQDFWAXVIIEBN-UHFFFAOYSA-N
MG	A	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N
GNP	A	PHOSPHOAMINOPHOSPHONIC ACID-GUANYLATE ESTER C10 H17 N6 O13 P3 UQABYHGXWYXDTK-UUOKFMHZSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.45 Å
• R-Value Free: 0.230 
• R-Value Work: 0.188 
• Space Group: P 3₂ 2 1

Unit Cell:

Length (Å)	Angle (°)
a = 40.330	α = 90.00
b = 40.330	β = 90.00
c = 161.330	γ = 120.00

Software Package:

Software Name	Purpose
SCALEPACK	data scaling
CNS	phasing
CNS	refinement
DENZO	data reduction

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2003-04-16 
• Released Date: 2003-08-05 
• Deposition Author(s): Buhrman, G.K., de Serrano, V., Mattos, C.

Revision History 

• Version 1.0: 2003-08-05
  Type: Initial release
• Version 1.1: 2008-04-29
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance