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)

Biological Assembly Evidence: gel filtration

Macromolecule Content

• Total Structure Weight: 95758.80 
• Atom Count: 6912 
• Residue Count: 816 
• Unique protein chains: 3

6CUO

Ras:SOS:Ras in complex with a small molecule activator

• DOI: 10.2210/pdb6CUO/pdb

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


• Deposited: 2018-03-26 Released: 2019-02-06 
• Deposition Author(s): Phan, J., Abbott, J., Fesik, S.W.
• Funding Organization(s): null 

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.73 Å
• R-Value Free: 0.178 
• R-Value Work: 0.164 

Literature

Discovery of Quinazolines That Activate SOS1-Mediated Nucleotide Exchange on RAS.

Abbott, J.R., Patel, P.A., Howes, J.E., Akan, D.T., Kennedy, J.P., Burns, M.C., Browning, C.F., Sun, Q., Rossanese, O.W., Phan, J., Waterson, A.G., Fesik, S.W.

(2018) ACS Med Chem Lett 9: 941-946

• PubMed: 30258545 
• Primary Citation of Related Structures:  
  6CUR, 6CUP

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
GTPase HRas	A	167	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 homolog 1	B	482	Homo sapiens	Mutation(s): 0  Gene Names: SOS1
Find proteins for Q07889 (Homo sapiens) Go to Gene View: SOS1 Go to UniProtKB:  Q07889

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details
GTPase HRas	C	167	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 6 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
NA	C	SODIUM ION Na FKNQFGJONOIPTF-UHFFFAOYSA-N
FMT	A, B, C	FORMIC ACID C H2 O2 BDAGIHXWWSANSR-UHFFFAOYSA-N
GOL	B	GLYCEROL GLYCERIN; PROPANE-1,2,3-TRIOL C3 H8 O3 PEDCQBHIVMGVHV-UHFFFAOYSA-N
MG	A	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N
GNP	A	PHOSPHOAMINOPHOSPHONIC ACID-GUANYLATE ESTER C10 H17 N6 O13 P3 UQABYHGXWYXDTK-UUOKFMHZSA-N
FFS	B	N~2~-(3-chlorophenyl)-N~4~-[(furan-2-yl)methyl]quinazoline-2,4-diamine C19 H15 Cl N4 O KLRNKMZSARWWTH-UHFFFAOYSA-N

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
CSO	A	L-PEPTIDE LINKING	C3 H7 N O3 S		CYS

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.73 Å
• R-Value Free: 0.178 
• R-Value Work: 0.164 
• Space Group: I 4 2 2

Unit Cell:

Length (Å)	Angle (°)
a = 183.806	α = 90.00
b = 183.806	β = 90.00
c = 178.872	γ = 90.00

Software Package:

Software Name	Purpose
PHENIX	refinement
SCALEPACK	data scaling
HKL-2000	data reduction
PHASER	phasing

Structure Validation

Entry History & Funding Information

Deposition Data

• Deposited Date: 2018-03-26 
• Released Date: 2019-02-06 
• Deposition Author(s): Phan, J., Abbott, J., Fesik, S.W.

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Funding Organization	Location	Grant Number
	United States	Lustgarten

Revision History 

• Version 1.0: 2019-02-06
  Type: Initial release