X-Ray structure of human Aquaporin 2 crystallized on a silicon chip

Experimental Data Snapshot

  • Resolution: 3.70 Å
  • R-Value Free: 0.336 
  • R-Value Work: 0.282 
  • R-Value Observed: 0.287 

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On-chip crystallization for serial crystallography experiments and on-chip ligand-binding studies.

Lieske, J.Cerv, M.Kreida, S.Komadina, D.Fischer, J.Barthelmess, M.Fischer, P.Pakendorf, T.Yefanov, O.Mariani, V.Seine, T.Ross, B.H.Crosas, E.Lorbeer, O.Burkhardt, A.Lane, T.J.Guenther, S.Bergtholdt, J.Schoen, S.Tornroth-Horsefield, S.Chapman, H.N.Meents, A.

(2019) IUCrJ 6: 714-728

  • DOI: https://doi.org/10.1107/S2052252519007395
  • Primary Citation of Related Structures:  
    6QF1, 6QF2, 6QF3, 6QF4, 6QF5

  • PubMed Abstract: 

    Efficient and reliable sample delivery has remained one of the bottlenecks for serial crystallography experiments. Compared with other methods, fixed-target sample delivery offers the advantage of significantly reduced sample consumption and shorter data collection times owing to higher hit rates. Here, a new method of on-chip crystallization is reported which allows the efficient and reproducible growth of large numbers of protein crystals directly on micro-patterned silicon chips for in-situ serial crystallography experiments. Crystals are grown by sitting-drop vapor diffusion and previously established crystallization conditions can be directly applied. By reducing the number of crystal-handling steps, the method is particularly well suited for sensitive crystal systems. Excessive mother liquor can be efficiently removed from the crystals by blotting, and no sealing of the fixed-target sample holders is required to prevent the crystals from dehydrating. As a consequence, 'naked' crystals are obtained on the chip, resulting in very low background scattering levels and making the crystals highly accessible for external manipulation such as the application of ligand solutions. Serial diffraction experiments carried out at cryogenic temperatures at a synchrotron and at room temperature at an X-ray free-electron laser yielded high-quality X-ray structures of the human membrane protein aquaporin 2 and two new ligand-bound structures of thermolysin and the human kinase DRAK2. The results highlight the applicability of the method for future high-throughput on-chip screening of pharmaceutical compounds.

  • Organizational Affiliation

    Center for Free-Electron Laser Science, Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, 22607 Hamburg, Germany.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B, C, D
242Homo sapiensMutation(s): 0 
Gene Names: AQP2
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for P41181 (Homo sapiens)
Explore P41181 
Go to UniProtKB:  P41181
PHAROS:  P41181
GTEx:  ENSG00000167580 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP41181
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.70 Å
  • R-Value Free: 0.336 
  • R-Value Work: 0.282 
  • R-Value Observed: 0.287 
  • Space Group: P 42
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 122.2α = 90
b = 122.2β = 90
c = 94.14γ = 90
Software Package:
Software NamePurpose
Cootmodel building
PDB_EXTRACTdata extraction
CrystFELdata reduction
CrystFELdata scaling

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
European Research CouncilGermany609920
European UnionGermanyHorizon 2020, No. 654220
German Federal Ministry for Education and ResearchGermany05K2018-2017-06727MXD
Swedish Research CouncilSweden2010-5208
Swedish Research CouncilSweden2012-2849
Department of Energy (DOE, United States)United StatesDE-AC02-76SF00515

Revision History  (Full details and data files)

  • Version 1.0: 2019-07-10
    Type: Initial release
  • Version 1.1: 2019-07-31
    Changes: Data collection, Database references
  • Version 1.2: 2022-03-30
    Changes: Author supporting evidence, Database references
  • Version 1.3: 2024-01-24
    Changes: Data collection, Refinement description