4OKA

Structural-, Kinetic- and Docking Studies of Artificial Imine Reductases Based on the Biotin-Streptavidin Technology: An Induced Lock-and-Key Hypothesis


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.505 Å
  • R-Value Free: 0.240 
  • R-Value Work: 0.198 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structural, Kinetic, and Docking Studies of Artificial Imine Reductases Based on Biotin-Streptavidin Technology: An Induced Lock-and-Key Hypothesis

Robles, V.M.Durrenberger, M.Heinisch, T.Lledos, A.Schirmer, T.Ward, T.R.Marechal, J.D.

(2014) J.Am.Chem.Soc. 136: 15676-15683

  • DOI: 10.1021/ja508258t

  • PubMed Abstract: 
  • An artificial imine reductase results upon incorporation of a biotinylated Cp*Ir moiety (Cp* = C5Me5(-)) within homotetrameric streptavidin (Sav) (referred to as Cp*Ir(Biot-p-L)Cl] ⊂ Sav). Mutation of S112 reveals a marked effect of the Ir/streptavid ...

    An artificial imine reductase results upon incorporation of a biotinylated Cp*Ir moiety (Cp* = C5Me5(-)) within homotetrameric streptavidin (Sav) (referred to as Cp*Ir(Biot-p-L)Cl] ⊂ Sav). Mutation of S112 reveals a marked effect of the Ir/streptavidin ratio on both the saturation kinetics as well as the enantioselectivity for the production of salsolidine. For [Cp*Ir(Biot-p-L)Cl] ⊂ S112A Sav, both the reaction rate and the selectivity (up to 96% ee (R)-salsolidine, kcat 14-4 min(-1) vs [Ir], KM 65-370 mM) decrease upon fully saturating all biotin binding sites (the ee varying between 96% ee and 45% ee R). In contrast, for [Cp*Ir(Biot-p-L)Cl] ⊂ S112K Sav, both the rate and the selectivity remain nearly constant upon varying the Ir/streptavidin ratio [up to 78% ee (S)-salsolidine, kcat 2.6 min(-1), KM 95 mM]. X-ray analysis complemented with docking studies highlight a marked preference of the S112A and S112K Sav mutants for the SIr and RIr enantiomeric forms of the cofactor, respectively. Combining both docking and saturation kinetic studies led to the formulation of an enantioselection mechanism relying on an "induced lock-and-key" hypothesis: the host protein dictates the configuration of the biotinylated Ir-cofactor which, in turn, by and large determines the enantioselectivity of the imine reductase.


    Organizational Affiliation

    Departament de Química, Universitat Autònoma de Barcelona , Edifici C.n., 08193 Cerdanyola del Vallés, Barcelona, Spain.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Streptavidin
A
159Streptomyces avidiniiMutation(s): 1 
Find proteins for P22629 (Streptomyces avidinii)
Go to UniProtKB:  P22629
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
IR
Query on IR

Download SDF File 
Download CCD File 
A
IRIDIUM ION
Ir
MOHYGSBMXIJZBJ-UHFFFAOYSA-N
 Ligand Interaction
5IR
Query on 5IR

Download SDF File 
Download CCD File 
A
[N-(4-{[2-(amino-kappaN)ethyl]sulfamoyl-kappaN}phenyl)-5-(2-oxohexahydro-1H-thieno[3,4-d]imidazol-4-yl)pentanamidato]iridium(III)
C18 H26 Ir N5 O4 S2
BXDCISRQDVZQNS-HAGMFFOZSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.505 Å
  • R-Value Free: 0.240 
  • R-Value Work: 0.198 
  • Space Group: I 41 2 2
Unit Cell:
Length (Å)Angle (°)
a = 57.605α = 90.00
b = 57.605β = 90.00
c = 183.325γ = 90.00
Software Package:
Software NamePurpose
MOSFLMdata reduction
Aimlessdata scaling
PHASERphasing
PHENIXrefinement
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-11-05
    Type: Initial release
  • Version 1.1: 2014-12-03
    Type: Database references