8ECR | pdb_00008ecr

KRAS4B 1-185 (C185S) bound to GDP-Mg2+

• PDB DOI: https://doi.org/10.2210/pdb8ECR/pdb

• Classification: HYDROLASE
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): Yes 


• Deposited: 2022-09-02 Released: 2023-09-06 
• Deposition Author(s): Betts, L., Rossman, K.L.
• Funding Organization(s): National Institutes of Health/National Cancer Institute (NIH/NCI)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.42 Å
• R-Value Free: 
  0.169 (Depositor), 0.235 (DCC) 
• R-Value Work: 
  0.147 (Depositor) 
• R-Value Observed: 
  0.165 (Depositor) 

Starting Model: experimental

Literature

KRAS4B 1-185 (C185S) bound to GDP-Mg2+

Betts, L., Rossman, K.L.

To be published.

Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Biological Assembly 2  

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

Biological assembly 2 assigned by authors.

Macromolecule Content 

• Total Structure Weight: 43.23 kDa 
• Atom Count: 3,001 
• Modeled Residue Count: 331 
• Deposited Residue Count: 370 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
GTPase KRas	A, B	185	Homo sapiens	Mutation(s): 1  Gene Names: KRAS, KRAS2, RASK2 EC: 3.6.5.2
UniProt & NIH Common Fund Data Resources
Find proteins for P01116 (Homo sapiens) Explore P01116  Go to UniProtKB:  P01116
PHAROS:  P01116 GTEx:  ENSG00000133703

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
GDP (Subject of Investigation/LOI)	D [auth A], G [auth B]	GUANOSINE-5'-DIPHOSPHATE C10 H15 N5 O11 P2 QGWNDRXFNXRZMB-UUOKFMHZSA-N
GOL	E [auth A]	GLYCEROL C3 H8 O3 PEDCQBHIVMGVHV-UHFFFAOYSA-N
MG (Subject of Investigation/LOI)	C [auth A], F [auth B]	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.42 Å
• R-Value Free:  0.169 (Depositor), 0.235 (DCC) 
• R-Value Work:  0.147 (Depositor) 
• R-Value Observed: 0.165 (Depositor) 

Space Group: P 3

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 84.313	α = 90
b = 84.313	β = 90
c = 41.733	γ = 120

Software Package:

Software Name	Purpose
PHENIX	refinement
XDS	data reduction
XDS	data scaling
PHENIX	phasing

Structure Validation

Entry History 

& Funding Information

Deposition Data

• Released Date: 2023-09-06 
Deposition Author(s): Betts, L., Rossman, K.L.

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Funding Organization	Location	Grant Number
National Institutes of Health/National Cancer Institute (NIH/NCI)	United States	5R01CA223495

Revision History  

• Version 1.0: 2023-09-06
  Type: Initial release
  
• Version 2.0: 2023-09-20
  Changes: Advisory, Author supporting evidence, Database references, Polymer sequence, Source and taxonomy, Structure summary
• Version 2.1: 2023-09-27
  Changes: Database references
• Version 2.2: 2026-03-04
  Changes: Database references, Refinement description, Structure summary