1DY4

CBH1 IN COMPLEX WITH S-PROPRANOLOL


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.220 
  • R-Value Work: 0.191 
  • R-Value Observed: 0.191 

Starting Model: experimental
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This is version 2.2 of the entry. See complete history


Literature

Structural Basis for Enantiomer Binding and Separation of a Common Beta-Blocker: Crystal Structure of Cellobiohydrolase Cel7A with Bound (S)-Propranolol at 1.9 A Resolution

Stahlberg, J.Henriksson, H.Divne, C.Isaksson, R.Pettersson, G.Johansson, G.Jones, T.A.

(2001) J Mol Biol 305: 79

  • DOI: https://doi.org/10.1006/jmbi.2000.4237
  • Primary Citation of Related Structures:  
    1DY4

  • PubMed Abstract: 

    Cellobiohydrolase Cel7A (previously called CBH 1), the major cellulase produced by the mould fungus Trichoderma reesei, has been successfully exploited as a chiral selector for separation of stereo-isomers of some important pharmaceutical compounds, e.g. adrenergic beta-blockers. Previous investigations, including experiments with catalytically deficient mutants of Cel7A, point unanimously to the active site as being responsible for discrimination of enantiomers. In this work the structural basis for enantioselectivity of basic drugs by Cel7A has been studied by X-ray crystallography. The catalytic domain of Cel7A was co-crystallised with the (S)-enantiomer of a common beta-blocker, propranolol, at pH 7, and the structure of the complex was determined and refined at 1. 9 A resolution. Indeed, (S)-propranolol binds at the active site, in glucosyl-binding subsites -1/+1. The catalytic residues Glu212 and Glu217 make tight salt links with the secondary amino group of (S)-propranolol. The oxygen atom attached to the chiral centre of (S)-propranolol forms hydrogen bonds to the nucleophile Glu212 O(epsilon1) and to Gln175 N(epsilon2), whereas the aromatic naphthyl moiety stacks with the indole ring of Trp376 in site +1. The bidentate charge interaction with the catalytic glutamate residues is apparently crucial, since no enantioselectivity has been obtained with the catalytically deficient mutants E212Q and E217Q. Activity inhibition experiments with wild-type Cel7A were performed in conditions close to those used for crystallisation. Competitive inhibition constants for (R)- and (S)-propranolol were determined at 220 microM and 44 microM, respectively, corresponding to binding free energies of 20 kJ/mol and 24 kJ/mol, respectively. The K(i) value for (R)-propranolol was 57-fold lower than the highest concentration, 12.5 mM, used in co-crystallisation experiments. Still several attempts to obtain a complex with the (R)-enantiomer have failed. By using cellobiose as a selective competing ligand, the retention of the enantiomers of propranolol on the chiral stationary phase (CSP) based on Cel7A mutant D214N were resolved into enantioselective and non- selective binding. The enantioselective binding was weaker for both enantiomers on D214N-CSP than on wild-type-CSP.


  • Organizational Affiliation

    Department of Molecular Biology, University of Uppsala, Uppsala, SE-751 24, Sweden.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
EXOGLUCANASE 1434Trichoderma reesei QM9414Mutation(s): 0 
EC: 3.2.1.91
UniProt
Find proteins for P62694 (Hypocrea jecorina)
Explore P62694 
Go to UniProtKB:  P62694
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP62694
Glycosylation
Glycosylation Sites: 2
Sequence Annotations
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  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
PCA
Query on PCA
A
L-PEPTIDE LINKINGC5 H7 N O3GLN
Binding Affinity Annotations 
IDSourceBinding Affinity
SNP PDBBind:  1DY4 Ki: 4.40e+4 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.220 
  • R-Value Work: 0.191 
  • R-Value Observed: 0.191 
  • Space Group: I 2 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 82.96α = 90
b = 83.11β = 90
c = 110.68γ = 90
Software Package:
Software NamePurpose
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling
CNSphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2000-12-18
    Type: Initial release
  • Version 1.1: 2011-07-20
    Changes: Other
  • Version 1.2: 2014-02-12
    Changes: Source and taxonomy
  • Version 1.3: 2017-07-05
    Changes: Data collection
  • Version 1.4: 2018-01-31
    Changes: Derived calculations
  • Version 1.5: 2019-05-08
    Changes: Data collection, Experimental preparation
  • Version 1.6: 2019-11-20
    Changes: Derived calculations, Other
  • Version 2.0: 2020-03-11
    Changes: Data collection, Polymer sequence
  • Version 2.1: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Data collection, Derived calculations, Structure summary
  • Version 2.2: 2023-12-06
    Changes: Data collection, Database references, Refinement description, Structure summary