Apo structure of class a beta-lactamase Toho-1 R274N/R276N double mutant

Experimental Data Snapshot

  • Resolution: 1.03 Å
  • R-Value Free: 0.148 
  • R-Value Work: 0.138 
  • R-Value Observed: 0.138 

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Improvement of crystal quality by surface mutations of beta-lactamase Toho-1

Shimamura, T.Nitanai, Y.Uchiyama, T.Matsuzawa, H.

(2009) Acta Crystallogr Sect F Struct Biol Cryst Commun 65: 379-382

  • DOI: https://doi.org/10.1107/S1744309109008240
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The beta-lactamase Toho-1 exhibits a strong tendency to form merohedrally twinned crystals. Here, the crystal quality of Toho-1 was improved by using surface modification to remove a sulfate ion involved in crystal packing. The surface-modified Toho-1 variant (R274N/R276N) was crystallized under similar conditions to those used for wild-type Toho-1. R274N/R276N did not form merohedrally twinned crystals. The crystals diffracted to a significantly higher resolution (approximately 0.97 A) than the wild-type crystals (1.65 A); they belonged to the same space group and had almost identical unit-cell parameters to those of wild-type Toho-1.

  • Organizational Affiliation

    RIKEN SPring-8 Center, Harima Institute, Kouto, Sayo, Hyogo 679-5148, Japan. t.shimamura@mfour.med.kyoto-u.ac.jp

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Beta-lactamase Toho-1262Escherichia coliMutation(s): 2 
Gene Names: bla
Find proteins for Q47066 (Escherichia coli)
Explore Q47066 
Go to UniProtKB:  Q47066
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ47066
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.03 Å
  • R-Value Free: 0.148 
  • R-Value Work: 0.138 
  • R-Value Observed: 0.138 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 72.511α = 90
b = 72.511β = 90
c = 97.477γ = 120
Software Package:
Software NamePurpose
HKL-2000data reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-07-28
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2021-11-10
    Changes: Database references, Derived calculations
  • Version 1.3: 2023-11-01
    Changes: Data collection, Refinement description