X-ray structure of AlgE2

Experimental Data Snapshot

  • Resolution: 2.90 Å
  • R-Value Free: 0.287 
  • R-Value Work: 0.251 
  • R-Value Observed: 0.253 

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In meso in situ serial X-ray crystallography of soluble and membrane proteins.

Huang, C.Y.Olieric, V.Ma, P.Panepucci, E.Diederichs, K.Wang, M.Caffrey, M.

(2015) Acta Crystallogr D Biol Crystallogr 71: 1238-1256

  • DOI: https://doi.org/10.1107/S1399004715005210
  • Primary Citation of Related Structures:  
    4XJB, 4XJD, 4XJF, 4XJG, 4XJH, 4XJI, 4XNI, 4XNJ, 4XNK, 4XNL

  • PubMed Abstract: 

    The lipid cubic phase (LCP) continues to grow in popularity as a medium in which to generate crystals of membrane (and soluble) proteins for high-resolution X-ray crystallographic structure determination. To date, the PDB includes 227 records attributed to the LCP or in meso method. Among the listings are some of the highest profile membrane proteins, including the β2-adrenoreceptor-Gs protein complex that figured in the award of the 2012 Nobel Prize in Chemistry to Lefkowitz and Kobilka. The most successful in meso protocol to date uses glass sandwich crystallization plates. Despite their many advantages, glass plates are challenging to harvest crystals from. However, performing in situ X-ray diffraction measurements with these plates is not practical. Here, an alternative approach is described that provides many of the advantages of glass plates and is compatible with high-throughput in situ measurements. The novel in meso in situ serial crystallography (IMISX) method introduced here has been demonstrated with AlgE and PepT (alginate and peptide transporters, respectively) as model integral membrane proteins and with lysozyme as a test soluble protein. Structures were solved by molecular replacement and by experimental phasing using bromine SAD and native sulfur SAD methods to resolutions ranging from 1.8 to 2.8 Å using single-digit microgram quantities of protein. That sulfur SAD phasing worked is testament to the exceptional quality of the IMISX diffraction data. The IMISX method is compatible with readily available, inexpensive materials and equipment, is simple to implement and is compatible with high-throughput in situ serial data collection at macromolecular crystallography synchrotron beamlines worldwide. Because of its simplicity and effectiveness, the IMISX approach is likely to supplant existing in meso crystallization protocols. It should prove particularly attractive in the area of ligand screening for drug discovery and development.

  • Organizational Affiliation

    Membrane Structural and Functional Biology Group, Schools of Medicine and Biochemistry and Immunology, Trinity College, Dublin, Ireland.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Alginate production protein AlgE490Pseudomonas aeruginosa PAO1Mutation(s): 0 
Gene Names: algEalg76PA3544
Membrane Entity: Yes 
Find proteins for P18895 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1))
Explore P18895 
Go to UniProtKB:  P18895
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP18895
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 5 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on PE5

Download Ideal Coordinates CCD File 
L [auth A]3,6,9,12,15,18,21,24-OCTAOXAHEXACOSAN-1-OL
C18 H38 O9
Query on 78N

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C18 H34 O4
Query on 78M

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H [auth A],
I [auth A],
K [auth A],
M [auth A]
C18 H34 O4
Query on LDA

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B [auth A]
C [auth A]
D [auth A]
E [auth A]
F [auth A]
B [auth A],
C [auth A],
D [auth A],
E [auth A],
F [auth A],
G [auth A],
N [auth A],
O [auth A]
C14 H31 N O
Query on CA

Download Ideal Coordinates CCD File 
Experimental Data & Validation

Experimental Data

  • Resolution: 2.90 Å
  • R-Value Free: 0.287 
  • R-Value Work: 0.251 
  • R-Value Observed: 0.253 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 47.38α = 90
b = 73.122β = 90
c = 184.84γ = 90
Software Package:
Software NamePurpose
XSCALEdata scaling
XDSdata reduction

Structure Validation

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Ligand Structure Quality Assessment 

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Science Foundation IrelandIreland12/IA/1255
National Institutes of HealthUnited StatesGM75915, P50GM073210, U54GM094599
Belgian National Funds for Scientific ResearchBelgiumWELBIO CR-2012S-04

Revision History  (Full details and data files)

  • Version 1.0: 2015-06-03
    Type: Initial release
  • Version 1.1: 2015-06-17
    Changes: Database references
  • Version 1.2: 2024-01-10
    Changes: Data collection, Database references, Refinement description, Structure summary