Biological Assembly 1  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 12.70 kDa 
• Atom Count: 1134 
• Modelled Residue Count: 120 
• Deposited Residue Count: 123 
• Unique protein chains: 1

1X6Z

Structure 1: cryocooled crystal structure of the truncated pak pilin from Pseudomonas aeruginosa at 0.78A resolution

• PDB DOI: 10.2210/pdb1X6Z/pdb

• Classification: STRUCTURAL PROTEIN
• Organism(s): Pseudomonas aeruginosa
• Expression System: Escherichia coli BL21
• Mutation(s): No 


• Deposited: 2004-08-12 Released: 2005-04-19 
• Deposition Author(s): Dunlop, K.V., Irvin, R.T., Hazes, B.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 0.78 Å
• R-Value Free: 0.153 
• R-Value Work: 0.142 
• R-Value Observed: 0.143 

Literature

Pros and cons of cryocrystallography: should we also collect a room-temperature data set?

Dunlop, K.V., Irvin, R.T., Hazes, B.

(2005) Acta Crystallogr D Biol Crystallogr 61: 80-87

• PubMed: 15608379 
• DOI: 10.1107/S0907444904027179
• Primary Citation of Related Structures:  
  1X6P, 1X6Q, 1X6R, 1X6X, 1X6Y, 1X6Z


• PubMed Abstract: 
  

High-resolution protein structures are becoming more common owing to the availability of increasingly brilliant synchrotron X-ray sources. However, to withstand the increased X-ray dose the crystals must be held at cryogenic temperatures. To compare the benefit of increased resolution with the drawback of potential temperature-induced changes, three room-temperature and three cryogenic data sets for PAK pilin have been collected at resolutions between 1.8 and 0.78 A. The results show that although the high-resolution cryogenic structures are more precise and more detailed, they also show systematic deviations from the room-temperature structures. Small but significant differences are even observed in the structural core, whilst more extensive changes occur at the protein surface. These differences can affect biological interpretations, especially because many important biological processes take place at the protein surface. Accordingly, although high-quality cryogenic synchrotron data is extremely valuable to protein crystallography, room-temperature structures are still desirable, especially if the research question involves protein features that are sensitive to temperature-induced changes.

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Organizational Affiliation: 

Department of Medical Microbiology and Immunology, University of Alberta, Canada.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Fimbrial protein	A	123	Pseudomonas aeruginosa	Mutation(s): 0  Gene Names: pilA, fimA
UniProt
Find proteins for P02973 (Pseudomonas aeruginosa) Explore P02973  Go to UniProtKB:  P02973

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 0.78 Å
• R-Value Free: 0.153 
• R-Value Work: 0.142 
• R-Value Observed: 0.143 
• Space Group: P 4₁ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 37.244	α = 90
b = 37.244	β = 90
c = 147.856	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
d*TREK	data reduction
CCP4	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2004-08-12 
• Released Date: 2005-04-19 
Deposition Author(s): Dunlop, K.V., Irvin, R.T., Hazes, B.

Revision History  

• Version 1.0: 2005-04-19
  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: 2013-03-06
  Changes: Other