2A6U

pH evolution of tetragonal HEWL at 4 degrees Celcius.

Experimental Data Snapshot

  • Method: POWDER DIFFRACTION

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history. 


Literature

High-throughput phase-diagram mapping via powder diffraction: a case study of HEWL versus pH.

Basso, S., Fitch, A.N., Fox, G.C., Margiolaki, I., Wright, J.P.

(2005) Acta Crystallogr D Biol Crystallogr 61: 1612-1625

  • DOI: 10.1107/S0907444905031963
  • Primary Citation of Related Structures:  
    2A6U

  • PubMed Abstract: 

    • 44 samples of tetragonal hen egg-white lysozyme (HEWL) were obtained as a series of polycrystalline precipitates at 277 K and room temperature in the pH range between 6.56 and 3.33. The precipitates were investigated by the collection of high-resolution powder X-ray diffraction data at 295 K, which reveal the tetragonal or orthorhombic forms of lysozyme depending on the temperature and pH of crystallization ...

    44 samples of tetragonal hen egg-white lysozyme (HEWL) were obtained as a series of polycrystalline precipitates at 277 K and room temperature in the pH range between 6.56 and 3.33. The precipitates were investigated by the collection of high-resolution powder X-ray diffraction data at 295 K, which reveal the tetragonal or orthorhombic forms of lysozyme depending on the temperature and pH of crystallization. The use of a new robotic sample changer greatly facilitated these measurements. LeBail analyses of the powder patterns display a characteristic behaviour for the pH dependence of the tetragonal unit-cell parameters of HEWL crystallized at both temperatures. More detailed analysis shows that molecular replacement can give a suitable starting point for structural refinements, illustrating that powder data can be sufficient for this approach. Pawley or Rietveld refinements that fit a single model to four data sets simultaneously from four samples crystallized at pH values across the range studied benefit from improved powder data quality via the anisotropic changes in the unit cell. The Rietveld analysis gave an average structural model with excellent goodness of fit and stereochemistry.

    Organizational Affiliation: 

    European Synchrotron Radiation Facility, Grenoble, France.



Macromolecules
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(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Lysozyme CA129Gallus gallusMutation(s): 0 
Gene Names: LYZ
EC: 3.2.1.17
UniProt
Find proteins for P00698 (Gallus gallus)
Explore P00698 
Go to UniProtKB:  P00698
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP00698
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: POWDER DIFFRACTION
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 78.827α = 90
b = 78.827β = 90
c = 38.163γ = 90
Software Package:
Software NamePurpose
GSASrefinement
ID31SUMdata scaling

Structure Validation

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Entry History 

Deposition Data

  • Deposited Date: 2005-07-04 
  • Released Date: 2006-01-03 
    • Deposition Author(s): Margiolaki, I.

Revision History  (Full details and data files)

  • Version 1.0: 2006-01-03
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2018-04-25
    Changes: Data collection