2XUG

Crystal structure of mAChE-Y337A-TZ2PA6 anti complex (1 wk)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.192 

Starting Model: experimental
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This is version 1.5 of the entry. See complete history


Literature

Conformational Remodeling of Femtomolar Inhibitor-Acetylcholinesterase Complexes in the Crystalline State

Bourne, Y.Radic, Z.Taylor, P.Marchot, P.

(2010) J Am Chem Soc 132: 18292

  • DOI: https://doi.org/10.1021/ja106820e
  • Primary Citation of Related Structures:  
    2XUD, 2XUF, 2XUG, 2XUH, 2XUI, 2XUJ, 2XUK, 2XUO, 2XUP, 2XUQ

  • PubMed Abstract: 

    The active center of acetylcholinesterase (AChE), a target site for competitive inhibitors, resides centrosymmetric to the subunit at the base of a deep, narrow gorge lined by aromatic residues. At the gorge entry, a peripheral site encompasses overlapping binding loci for noncompetitive inhibitors, which alter substrate access to the gorge. The click-chemistry inhibitor TZ2PA6 links the active center ligand, tacrine, to the peripheral site ligand, propidium, through a biorthogonal reaction of an acetylene and an azide that forms either a syn1 or an anti1 triazole. Compared with wild-type mouse AChE, a Tyr337Ala mutant displays full catalytic activity, albeit with 2-3 orders of magnitude higher affinities for the TZ2PA6 syn1 and anti1 regioisomers, reflected in low femtomolar K(d) values, diffusion-limited association, and dissociation half-times greater than 1 month and 1 week, respectively. Three structures of each of the co-crystallized syn1 and anti1 complexes of the Tyr337Ala mutant were solved at three distinct times of crystal maturation, consistent with or exceeding the half-lives of the complexes in solution, while crystalline complexes obtained from soaked Tyr337Ala crystals led to picturing "freshly formed" complexes. The structures, at 2.55-2.75 Å resolution, reveal a range of unprecedented conformations of the bound regioisomers, not observed in the wild-type AChE complexes, associated with concerted positional rearrangements of side chains in the enzyme gorge. Moreover, time-dependent conformational remodeling of the crystalline complexes appears to correlate with the dissociation half-times of the solution complexes. Hence, for the tight-binding TZ2PA6 inhibitors, the initial complexes kinetically driven in solution slowly form more stable complexes governed by thermodynamic equilibrium and observable in mature crystals.


  • Organizational Affiliation

    Architecture et Fonction des Macromolécules Biologiques (AFMB, CNRS UMR-6098), Universités d'Aix-Marseille, Campus Luminy-Case 932, F-13288 Marseille cedex 09, France. yves.bourne@afmb.univ-mrs.fr


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
ACETYLCHOLINESTERASE
A, B
544Mus musculusMutation(s): 1 
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
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP21836
Glycosylation
Glycosylation Sites: 2Go to GlyGen: P21836-1
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.192 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 79.463α = 90
b = 111.7β = 90
c = 227.463γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
HKL-2000data reduction
SCALAdata scaling
REFMACphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-12-08
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Data collection, Derived calculations, Other, Structure summary
  • Version 1.4: 2021-05-12
    Changes: Derived calculations, Structure summary
  • Version 1.5: 2023-12-20
    Changes: Data collection, Database references, Refinement description