Chimeric Family 1 beta-glucosidase made with non-contiguous SCHEMA

Experimental Data Snapshot

  • Resolution: 3.00 Å
  • R-Value Free: 0.294 
  • R-Value Work: 0.239 
  • R-Value Observed: 0.242 

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This is version 1.2 of the entry. See complete history


Chimeragenesis of distantly-related proteins by noncontiguous recombination.

Smith, M.A.Romero, P.A.Wu, T.Brustad, E.M.Arnold, F.H.

(2013) Protein Sci 22: 231-238

  • DOI: https://doi.org/10.1002/pro.2202
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    We introduce a method for identifying elements of a protein structure that can be shuffled to make chimeric proteins from two or more homologous parents. Formulating recombination as a graph-partitioning problem allows us to identify noncontiguous segments of the sequence that should be inherited together in the progeny proteins. We demonstrate this noncontiguous recombination approach by constructing a chimera of β-glucosidases from two different kingdoms of life. Although the protein's alpha-beta barrel fold has no obvious subdomains for recombination, noncontiguous SCHEMA recombination generated a functional chimera that takes approximately half its structure from each parent. The X-ray crystal structure shows that the structural blocks that make up the chimera maintain the backbone conformations found in their respective parental structures. Although the chimera has lower β-glucosidase activity than the parent enzymes, the activity was easily recovered by directed evolution. This simple method, which does not rely on detailed atomic models, can be used to design chimeras that take structural, and functional, elements from distantly-related proteins.

  • Organizational Affiliation

    Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Beta-glucosidase Chimeric protein
A, B, C
467Thermotoga maritima MSB8Trichoderma reeseiMutation(s): 6 
Gene Names: bglAbgl2
Find proteins for O93785 (Hypocrea jecorina)
Explore O93785 
Go to UniProtKB:  O93785
Find proteins for Q08638 (Thermotoga maritima (strain ATCC 43589 / DSM 3109 / JCM 10099 / NBRC 100826 / MSB8))
Explore Q08638 
Go to UniProtKB:  Q08638
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupsO93785Q08638
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.00 Å
  • R-Value Free: 0.294 
  • R-Value Work: 0.239 
  • R-Value Observed: 0.242 
  • Space Group: P 31 1 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 115.377α = 90
b = 115.377β = 90
c = 282.538γ = 120
Software Package:
Software NamePurpose
SCALAdata scaling
PDB_EXTRACTdata extraction
Blu-Icedata collection
XSCALEdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-01-09
    Type: Initial release
  • Version 1.1: 2013-08-28
    Changes: Database references
  • Version 1.2: 2017-07-26
    Changes: Refinement description, Source and taxonomy