Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 3-mer - A2B 

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

Macromolecule Content

• Total Structure Weight: 94897.52 
• Atom Count: 6418 
• Residue Count: 813 
• Unique protein chains: 2

1NVX

Structural evidence for feedback activation by RasGTP of the Ras-specific nucleotide exchange factor SOS

• DOI: 10.2210/pdb1NVX/pdb

• Classification: SIGNALING PROTEIN
• Organism(s): Homo sapiens
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): 1 


• Deposited: 2003-02-04 Released: 2003-04-01 
• Deposition Author(s): Margarit, S.M., Sondermann, H., Hall, B.E., Nagar, B., Hoelz, A., Pirruccello, M., Bar-Sagi, D., Kuriyan, J.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3.2 Å
• R-Value Free: 0.261 
• R-Value Work: 0.223 

Literature

Structural evidence for feedback activation by RasGTP of the Ras-specific nucleotide exchange factor SOS

Margarit, S.M., Sondermann, H., Hall, B.E., Nagar, B., Hoelz, A., Pirruccello, M., Bar-Sagi, D., Kuriyan, J.

(2003) Cell 112: 685-695

• PubMed: 12628188 
• Primary Citation of Related Structures:  
  1NVW, 1NVV, 1NVU


• PubMed Abstract: 
  

Growth factor receptors activate Ras by recruiting the nucleotide exchange factor son of sevenless (SOS) to the cell membrane, thereby triggering the production of GTP-loaded Ras. Crystallographic analyses of Ras bound to the catalytic module of SOS have led to the unexpected discovery of a highly conserved Ras binding site on SOS that is located distal to the active site and is specific for Ras.GTP. The crystal structures suggest that Ras.GTP stabilizes the active site of SOS allosterically, and we show that Ras.GTP forms ternary complexes with SOS(cat) in solution and increases significantly the rate of SOS(cat)-stimulated nucleotide release from Ras. These results demonstrate the existence of a positive feedback mechanism for the spatial and temporal regulation of Ras.

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Organizational Affiliation: 

Department of Molecular Genetics and Microbiology, State University of New York at Stony Brook, Stony Brook, NY 11794, USA.

Macromolecules

Find similar proteins by: Sequence  |  Structure

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

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details
Son of sevenless protein homolog 1	S	481	Homo sapiens	Mutation(s): 0  Gene Names: SOS1
Find proteins for Q07889 (Homo sapiens) Go to Gene View: SOS1 Go to UniProtKB:  Q07889

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
PO4	R	PHOSPHATE ION O4 P NBIIXXVUZAFLBC-UHFFFAOYSA-K
GTP	Q	GUANOSINE-5'-TRIPHOSPHATE C10 H16 N5 O14 P3 XKMLYUALXHKNFT-UUOKFMHZSA-N
MG	Q	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 3.2 Å
• R-Value Free: 0.261 
• R-Value Work: 0.223 
• Space Group: I 4 2 2

Unit Cell:

Length (Å)	Angle (°)
a = 175.206	α = 90.00
b = 175.206	β = 90.00
c = 234.128	γ = 90.00

Software Package:

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

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2003-02-04 
• Released Date: 2003-04-01 
• Deposition Author(s): Margarit, S.M., Sondermann, H., Hall, B.E., Nagar, B., Hoelz, A., Pirruccello, M., Bar-Sagi, D., Kuriyan, J.

Revision History 

• Version 1.0: 2003-04-01
  Type: Initial release
• Version 1.1: 2008-04-29
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance