Proteinase K by Langmuir-Blodgett Hanging Drop Method at 1.8A resolution for Unique Water Distribution

Experimental Data Snapshot

  • Resolution: 1.80 Å
  • R-Value Free: 0.202 
  • R-Value Work: 0.156 
  • R-Value Observed: 0.159 

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Unique water distribution of Langmuir-Blodgett versus classical crystals.

Pechkova, E.Sivozhelezov, V.Belmonte, L.Nicolini, C.

(2012) J Struct Biol 180: 57-64

  • DOI: https://doi.org/10.1016/j.jsb.2012.05.021
  • Primary Citation of Related Structures:  
    4DIY, 4DIZ, 4DJ0, 4DJ1, 4DJ5

  • PubMed Abstract: 

    Langmuir-Blodgett films when used as nanotemplates for crystallization often leads to marked changes in protein stability and structure. Earlier we found that stability of proteins is also correlated with aqueous surroundings in the crystals. Here we study the direct relationships between presence of LB nanotemplates and unique patterns of water molecules surrounding the protein, for four model proteins for which 3D structures are available, and where crystallization conditions for each protein are the same except the presence of LB nanotemplate. Shape of frequency distribution of volumes occupied by water molecules were analyzed. They were found to be different between "classical" samples of different proteins, but surprisingly quite similar for LB samples. Volumes occupied by each water molecule as the function of the distance of the given molecule from the protein surface were studied. Introduction of LB film leads to appearance of water molecules close to protein surface but occupying large volumes. These findings confirm earlier experimental findings on the role of water molecules in determining protein stability and thereby pointing to water as a possible candidate for differences apparent in LB crystal stability against radiation.

  • Organizational Affiliation

    Nanoworld Institute, Fondazione EL.B.A. Nicolini, Largo Redaelli 7, Pradalunga, Bergamo, Italy.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Proteinase KA [auth X]279Parengyodontium albumMutation(s): 0 
Gene Names: PROK
Find proteins for P06873 (Parengyodontium album)
Explore P06873 
Go to UniProtKB:  P06873
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP06873
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.80 Å
  • R-Value Free: 0.202 
  • R-Value Work: 0.156 
  • R-Value Observed: 0.159 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 67.95α = 90
b = 67.95β = 90
c = 102.18γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling
PDB_EXTRACTdata extraction

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-07-18
    Type: Initial release
  • Version 1.1: 2012-10-31
    Changes: Database references