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In a paper published online on 12 August 2026, Paknia and colleagues reported a 0.43 Å X-ray structure of Pyrococcus abyssi rubredoxin. They described it as the highest-resolution protein structure determined “to the best of our knowledge.” The result depended on an exceptionally large, well-ordered cryocooled crystal, carefully matched X-ray illumination, dose management and a model able to interpret subtle electron-density features—not simply a brighter beam.
What does the reported resolution mean?
In crystallography, resolution describes the smallest spacing between features that the diffraction data can distinguish. A smaller ångström value generally permits finer structural detail, but the headline number alone does not tell you whether diffraction was equally strong in every direction or how complete the dataset was.
For the rubredoxin dataset, the authors reported directional diffraction limits of 0.441, 0.462 and 0.456 Å. They gave the overall resolution range as 26.62–0.433 Å, reflecting an anisotropic cutoff: the data did not extend equally far in all reciprocal-space directions.
| Data-quality measure | Reported value | How to read it |
|---|---|---|
| Completeness, ellipsoidal cutoff | 96.2% overall; 59.9% in the highest-resolution shell | Fraction of reflections included within a direction-dependent cutoff. |
| Completeness, spherical cutoff | 84.4% overall; 22.3% in the highest-resolution shell | Fraction within a spherical cutoff; it is lower here than for the ellipsoidal cutoff. |
| Mean I/σ(I) | 23.9 overall; 1.7 in the highest-resolution shell | Average measured reflection intensity relative to its estimated uncertainty. |
| Reflections | 6,545,565 total; 245,905 unique | Total observations and distinct reflections reported for the dataset. |
These qualifications matter: the record claim concerns the authors’ reported dataset and its stated resolution convention, not a guarantee that every direction or every measured reflection supports the same level of detail. Source: Paknia et al., Acta Crystallographica Section D, 2026.
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How did the team collect the diffraction data?
They began with an unusually large crystal
The researchers expressed and purified a W4L, R5S variant of rubredoxin from P. abyssi. They grew crystals by sitting-drop vapor diffusion in concentrated sodium malonate, then directly cryo-cooled the selected crystal in liquid nitrogen. The crystal used for diffraction measured approximately 600 × 500 × 300 μm and was mounted in a MiTeGen Dual Thickness MicroLoop.
They matched the beam to the sample
At EMBL Hamburg’s P14 beamline on DESY’s PETRA III storage ring, the team used a top-hat X-ray beam measuring 601 × 507 μm—slightly larger than the crystal. A top-hat beam aims to provide relatively uniform illumination across its footprint, rather than concentrating intensity into a narrow, unevenly illuminated spot. That helped expose the large sample consistently.
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They collected multiple orientations at cryogenic temperature
Data were collected at 100 K using 32.142 keV X-rays (0.3857 Å wavelength) and a DECTRIS EIGER2 CdTe 16M detector. An automated workflow characterized the crystal, planned data collection at multiple orientations and coordinated processing. Changing orientations helped improve reciprocal-space coverage while accounting for experimental geometry and shadowing.
Why were crystal quality and dose control important?
Radiation can damage a crystal during X-ray exposure, potentially degrading diffraction and obscuring the structural signal. The study estimated a total absorbed dose of 500 kGy. The authors emphasize low-dose collection and exceptionally well-ordered crystals as important to accurate electron-density work at this scale.
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The paper reports that reaching the 0.5–0.7 Å range or better typically requires very low average B factors, and that the authors’ experience indicates crystals larger than 250 μm in each dimension are desirable for reproducible sub-ångström data collection. These are the authors’ reported experience and guidance, not universal thresholds for every protein, crystal or beamline.
Why did the researchers use an aspherical atom model?
The independent atom model (IAM), a conventional refinement approach, represents atoms with spherical scattering factors. In this study, the IAM difference maps showed positive density around chemical-bond midpoints. Treating atoms as isolated spheres does not describe bonding-electron deformation particularly well, so those features can remain in the difference density.
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The team linked the transferable aspherical atom model (TAAM) library DiSCaMB to BUSTER. TAAM represents aspherical electron distributions; in the reported refinement, it modeled the positive bond-midpoint density as bonding-electron deformation density. This made the electron-density interpretation more informative than relying on the spherical-atom model alone.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What can this level of detail reveal—and what does it not prove?
The authors report accurate nuclear positions, including hydrogen atoms, as well as electron-density observations such as density between bonded atoms and atomic partial charges. Those are structural and electronic details inferred from the diffraction data and refinement model; they are not direct video-like observations of a protein’s motion or a universal description of every protein.
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The work demonstrates the approach on rubredoxin. The authors suggest that it could support more routine quantum crystallography of biological macromolecules when sufficiently accurate diffraction data are available, but that broader routine use is a prospective possibility, not an outcome established for all proteins by this one structure.
Why is sub-ångström protein crystallography still unusual?
Paknia et al. counted 20 PDB entries in the 0.5–0.7 Å range as of 9 May 2026: 15 protein structures, four Z-DNA structures and one RNA structure. That snapshot predates the August 2026 rubredoxin report and illustrates how uncommon such measurements were; it is not a count of all structures at or below 0.7 Å after the report.
How does this synchrotron method differ from XFEL crystallography?
| Approach | When it is useful | Main advantage | Trade-off |
|---|---|---|---|
| Low-dose synchrotron macromolecular crystallography | When a sufficiently large, well-ordered crystal is available and the aim is very high detail from a cryogenic static structure. | The rubredoxin study combined cryogenic collection, a crystal-matched top-hat beam, dose management and multiple orientations. | Crystal quality and size are demanding, and radiation damage still constrains exposure and data collection. |
| Serial femtosecond crystallography (SFX) at an X-ray free-electron laser | When crystals are small, room-temperature measurements are needed, or fast or irreversible dynamics are being studied. | Ultrashort intense pulses can collect diffraction before many damage processes develop; fresh crystals are delivered serially. | Each crystal is ultimately destroyed, so many crystals and specialized delivery and processing infrastructure are required. SFX was not used for the rubredoxin result. |
“Diffraction before destruction” does not mean that XFEL experiments are free of all damage: a 2019 IUCr review discusses both the ability of pulses to outrun many damage processes and evidence of damage that still requires mitigation. European XFEL describes SFX as useful for small crystals and time-resolved work.
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