6T2Y

Streptavidin variants harbouring an artificial organocatalyst based cofactor


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.240 
  • R-Value Work: 0.193 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.3 of the entry. See complete history


Literature

An Artificial Cofactor Catalyzing the Baylis-Hillman Reaction with Designed Streptavidin as Protein Host*.

Lechner, H.Emann, V.R.Breuning, M.Hocker, B.

(2021) Chembiochem 22: 1573-1577

  • DOI: https://doi.org/10.1002/cbic.202000880
  • Primary Citation of Related Structures:  
    6T1E, 6T1G, 6T1K, 6T2L, 6T2Y, 6T2Z, 6T30, 6T31, 6T32

  • PubMed Abstract: 

    An artificial cofactor based on an organocatalyst embedded in a protein has been used to conduct the Baylis-Hillman reaction in a buffered system. As protein host, we chose streptavidin, as it can be easily crystallized and thereby supports the design process. The protein host around the cofactor was rationally designed on the basis of high-resolution crystal structures obtained after each variation of the amino acid sequence. Additionally, DFT-calculated intermediates and transition states were used to rationalize the observed activity. Finally, repeated cycles of structure determination and redesign led to a system with an up to one order of magnitude increase in activity over the bare cofactor and to the most active proteinogenic catalyst for the Baylis-Hillman reaction known today.


  • Organizational Affiliation

    Department of Biochemistry, University Bayreuth, Universitätsstrasse 30, 95447, Bayreuth, Germany.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Streptavidin
A, B
159Streptomyces avidiniiMutation(s): 0 
UniProt
Find proteins for P22629 (Streptomyces avidinii)
Explore P22629 
Go to UniProtKB:  P22629
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP22629
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.240 
  • R-Value Work: 0.193 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 57.515α = 90
b = 84.449β = 90
c = 98.665γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
Cootmodel building
XDSdata reduction
XDSdata scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Austrian Science FundAustriaJ 3994

Revision History  (Full details and data files)

  • Version 1.0: 2020-11-18
    Type: Initial release
  • Version 1.1: 2021-05-05
    Changes: Database references
  • Version 1.2: 2021-05-12
    Changes: Database references
  • Version 1.3: 2024-01-24
    Changes: Advisory, Data collection, Database references, Refinement description