Structure of the A2A adenosine receptor determined at SwissFEL using native-SAD at 4.57 keV from all available diffraction patterns

Experimental Data Snapshot

  • Resolution: 2.65 Å
  • R-Value Free: 0.220 
  • R-Value Work: 0.197 
  • R-Value Observed: 0.199 

wwPDB Validation   3D Report Full Report

Ligand Structure Quality Assessment 

This is version 1.2 of the entry. See complete history


Advances in long-wavelength native phasing at X-ray free-electron lasers.

Nass, K.Cheng, R.Vera, L.Mozzanica, A.Redford, S.Ozerov, D.Basu, S.James, D.Knopp, G.Cirelli, C.Martiel, I.Casadei, C.Weinert, T.Nogly, P.Skopintsev, P.Usov, I.Leonarski, F.Geng, T.Rappas, M.Dore, A.S.Cooke, R.Nasrollahi Shirazi, S.Dworkowski, F.Sharpe, M.Olieric, N.Bacellar, C.Bohinc, R.Steinmetz, M.O.Schertler, G.Abela, R.Patthey, L.Schmitt, B.Hennig, M.Standfuss, J.Wang, M.Milne, C.J.

(2020) IUCrJ 7: 965-975

  • DOI: https://doi.org/10.1107/S2052252520011379
  • Primary Citation of Related Structures:  
    6S0L, 6S0Q, 6S19, 6S1D, 6S1E, 6S1G

  • PubMed Abstract: 

    Long-wavelength pulses from the Swiss X-ray free-electron laser (XFEL) have been used for de novo protein structure determination by native single-wavelength anomalous diffraction (native-SAD) phasing of serial femtosecond crystallography (SFX) data. In this work, sensitive anomalous data-quality indicators and model proteins were used to quantify improvements in native-SAD at XFELs such as utilization of longer wavelengths, careful experimental geometry optimization, and better post-refinement and partiality correction. Compared with studies using shorter wavelengths at other XFELs and older software versions, up to one order of magnitude reduction in the required number of indexed images for native-SAD was achieved, hence lowering sample consumption and beam-time requirements significantly. Improved data quality and higher anomalous signal facilitate so-far underutilized de novo structure determination of challenging proteins at XFELs. Improvements presented in this work can be used in other types of SFX experiments that require accurate measurements of weak signals, for example time-resolved studies.

  • Organizational Affiliation

    Institute of Molecular Biology and Biophysics, Department of Biology, ETH Zürich, Wolfgang-Pauli-Strasse 27, Zürich, 8093, Switzerland.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A2a adenosine receptor433Homo sapiensMutation(s): 0 
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for P29274 (Homo sapiens)
Explore P29274 
Go to UniProtKB:  P29274
GTEx:  ENSG00000128271 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP29274
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 5 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on CLR

Download Ideal Coordinates CCD File 
N [auth A],
O [auth A],
P [auth A]
C27 H46 O
Query on OLC

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L [auth A],
M [auth A]
(2R)-2,3-dihydroxypropyl (9Z)-octadec-9-enoate
C21 H40 O4
Query on OLB

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J [auth A],
K [auth A]
(2S)-2,3-dihydroxypropyl (9Z)-octadec-9-enoate
C21 H40 O4
Query on ZMA

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B [auth A]4-{2-[(7-amino-2-furan-2-yl[1,2,4]triazolo[1,5-a][1,3,5]triazin-5-yl)amino]ethyl}phenol
C16 H15 N7 O2
Query on OLA

Download Ideal Coordinates CCD File 
C [auth A]
D [auth A]
E [auth A]
F [auth A]
G [auth A]
C [auth A],
D [auth A],
E [auth A],
F [auth A],
G [auth A],
H [auth A],
I [auth A]
C18 H34 O2
Experimental Data & Validation

Experimental Data

Unit Cell:
Length ( Å )Angle ( ˚ )
a = 40.34α = 90
b = 180.66β = 90
c = 143.05γ = 90
Software Package:
Software NamePurpose
CrystFELdata reduction
CrystFELdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Revision History  (Full details and data files)

  • Version 1.0: 2020-07-15
    Type: Initial release
  • Version 1.1: 2020-12-02
    Changes: Database references
  • Version 1.2: 2023-12-13
    Changes: Data collection, Database references, Refinement description