4ARB

Mus musculus Acetylcholinesterase in complex with (S)-C5685 at 2.25 A resolution.

• PDB DOI: https://doi.org/10.2210/pdb4ARB/pdb

• Classification: HYDROLASE
• Organism(s): Mus musculus
• Expression System: Homo sapiens
• Mutation(s): No 


• Deposited: 2012-04-23 Released: 2012-11-28 
• Deposition Author(s): Berg, L., Niemiec, M.S., Qian, W., Andersson, C.D., WittungStafshede, P., Ekstrom, F., Linusson, A.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.25 Å
• R-Value Free: 0.209 
• R-Value Work: 0.172 
• R-Value Observed: 0.172 

Biological Assembly 1  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Homo 2-mer - A2 

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

Macromolecule Content

• Total Structure Weight: 122.75 kDa 
• Atom Count: 9,506 
• Modelled Residue Count: 1,068 
• Deposited Residue Count: 1,096 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
ACETYLCHOLINESTERASE	A, B	548	Mus musculus	Mutation(s): 0  EC: 3.1.1.7
UniProt & NIH Common Fund Data Resources
Find proteins for P21836 (Mus musculus) Explore P21836  Go to UniProtKB:  P21836
IMPC:  MGI:87876

Small Molecules

Ligands 4 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
C57	C [auth A], J [auth B]	4-(DIMETHYLAMINO)-N-{[(2S)-1-ETHYLPYRROLIDIN-2-YL]METHYL}-2-METHOXY-5-NITROBENZAMIDE C17 H26 N4 O4 AFNPLUMDSLEAPD-LBPRGKRZSA-N
P6G	K [auth B]	HEXAETHYLENE GLYCOL C12 H26 O7 IIRDTKBZINWQAW-UHFFFAOYSA-N
NAG	E [auth A], G [auth A], M [auth B]	2-acetamido-2-deoxy-beta-D-glucopyranose C8 H15 N O6 OVRNDRQMDRJTHS-FMDGEEDCSA-N
PEG	D [auth A], F [auth A], H [auth A], I [auth A], L [auth B], N [auth B]	DI(HYDROXYETHYL)ETHER C4 H10 O3 MTHSVFCYNBDYFN-UHFFFAOYSA-N

Binding Affinity Annotations
ID	Source	Binding Affinity
C57	PDBBind:  4ARB	Kd: 1300 (nM) from 1 assay(s)
	Binding MOAD:  4ARB	Kd: 1300 (nM) from 1 assay(s)

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.25 Å
• R-Value Free: 0.209 
• R-Value Work: 0.172 
• R-Value Observed: 0.172 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 78.926	α = 90
b = 111.781	β = 90
c = 227.071	γ = 90

Software Package:

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

Structure Validation

Entry History 

Deposition Data

• Released Date: 2012-11-28 
Deposition Author(s): Berg, L., Niemiec, M.S., Qian, W., Andersson, C.D., WittungStafshede, P., Ekstrom, F., Linusson, A.

Revision History  

• Version 1.0: 2012-11-28
  Type: Initial release
  
• Version 1.1: 2013-01-16
  Changes: Database references
• Version 2.0: 2018-01-17
  Changes: Atomic model, Data collection
• Version 2.1: 2018-02-28
  Changes: Source and taxonomy
• Version 2.2: 2020-07-29
  Type: Remediation
  Reason: Carbohydrate remediation
  Changes: Data collection, Derived calculations, Other, Structure summary
• Version 2.3: 2023-12-20
  Changes: Data collection, Database references, Refinement description, Structure summary