36OR | pdb_000036or

Room-temperature multiconformer model of HRas-GMPPNP

• PDB DOI: https://doi.org/10.2210/pdb36OR/pdb

• Classification: ONCOPROTEIN
• Organism(s): Homo sapiens
• Expression System: Escherichia coli BL21
• Mutation(s): No 


• Deposited: 2026-06-24 Released: 2026-11-04 
• Deposition Author(s): Wang, H.K., Hekstra, D.R.
• Funding Organization(s): National Science Foundation (NSF, United States), National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.90 Å
• R-Value Free: 
  0.173 (Depositor), 0.173 (DCC) 
• R-Value Work: 
  0.136 (Depositor), 0.137 (DCC) 
• R-Value Observed: 
  0.137 (Depositor) 

Starting Models: experimental

Literature

Symmetry Breaking under Vectorial Perturbations in Macromolecular X-ray Crystallography.

Wang, H.K., Greisman, J.B., Dalton, K.M., Hewitt, R.A., White, K.I., Hekstra, D.R.

(2026) bioRxiv 

• PubMed: 42856210 
• DOI: https://doi.org/10.64898/2026.09.28.753211
• Primary Citation Related Structures: 
  36OR, 36OU


• PubMed Abstract: 
  

  Proteins are molecular machines whose dynamics govern their function. Using time-resolved crystallography, the basis of protein mechanics can be uncovered by physical perturbation on protein crystals. Perturbations are often vector fields that, in crystals, break symmetry. Lacking existing tools for analyzing symmetry breaking, we built open-source software to do so. We applied this method to three time-resolved crystallography experiments and analyzed the effect of vectorial perturbations on macromolecular crystal structure. We demonstrate that our method can handle symmetry reduction in all 65 Sohncke space groups.

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Organizational Affiliation: 
• Department of Molecular and Cellular Biology, Harvard University, Cambridge, MA 02138, USA.
Graduate Program in Biophysics, Harvard University, Boston, MA 02115, USA.
Current address: D. E. Shaw Research New York, NY 10036, USA.
Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, 94025, CA, USA.
Department of Biology, New York University, New York, NY 10003.
Department of Molecular and Cellular Physiology, Department of Neurology and Neurological Sciences, Department of Structural Biology, Department of Photon Science, Howard Hughes Medical Institute, Stanford University, Stanford, CA, 94305.
John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138.

Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Macromolecule Content 

• Total Structure Weight: 19.63 kDa 
• Atom Count: 2,478 
• Modeled Residue Count: 166 
• Deposited Residue Count: 166 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
GTPase HRas	A	166	Homo sapiens	Mutation(s): 0  Gene Names: HRAS, HRAS1 EC: 3.6.5.2
UniProt & NIH Common Fund Data Resources
Find proteins for P01112 (Homo sapiens) Explore P01112  Go to UniProtKB:  P01112
PHAROS:  P01112 GTEx:  ENSG00000174775

Small Molecules

Ligands 4 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
GNP (Subject of Investigation/LOI)	E [auth A]	PHOSPHOAMINOPHOSPHONIC ACID-GUANYLATE ESTER C10 H17 N6 O13 P3 UQABYHGXWYXDTK-UUOKFMHZSA-N
ACT	H [auth A]	ACETATE ION C2 H3 O2 QTBSBXVTEAMEQO-UHFFFAOYSA-M
CA	B [auth A], C [auth A], F [auth A]	CALCIUM ION Ca BHPQYMZQTOCNFJ-UHFFFAOYSA-N
MG	D [auth A], G [auth A]	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.90 Å
• R-Value Free:  0.173 (Depositor), 0.173 (DCC) 
• R-Value Work:  0.136 (Depositor), 0.137 (DCC) 
• R-Value Observed: 0.137 (Depositor) 

Space Group: H 3 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 89.967	α = 90
b = 89.967	β = 90
c = 136.406	γ = 120

Software Package:

Software Name	Purpose
PHENIX	refinement
Aimless	data scaling
XDS	data reduction
PDB_EXTRACT	data extraction
PHENIX	phasing

Structure Validation

Entry History 

& Funding Information

Deposition Data

• Released Date: 2026-11-04 
Deposition Author(s): Wang, H.K., Hekstra, D.R.

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Funding Organization	Location	Grant Number
National Science Foundation (NSF, United States)	United States	DGE2140743
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)	United States	DP2-GM141000

Revision History  

• Version 1.0: 2026-11-04
  Type: Initial release