Evidence map›Paper›PMID 22681901›Full record

ArticleStructure (London, England : 1993)2012

Improving the accuracy of macromolecular structure refinement at 7 Å resolution.

Axel T Brunger, Paul D Adams, Petra Fromme, Raimund Fromme, Michael Levitt, Gunnar F Schröder

Abstract readComparative Study
In one paragraph

Article in Structure (London, England : 1993), 2012. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 23 papers.

0numbers the graph read from it
0cells of the map it votes in
23citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

23 citing papers in PubMed.

  1. Article
  2. Article
  3. Article
  4. Article
  5. Article
  6. Article
  7. Article
  8. Article
  9. Article
  10. Article
  11. New method to compute Rcomplete enables maximum likelihood refinement for small datasets.Proceedings of the National Academy of Sciences of the United States of America · 2015
    Article
  12. Review
  13. Article
  14. xMDFF: molecular dynamics flexible fitting of low-resolution X-ray structures.Acta crystallographica. Section D, Biological crystallography · 2014
    Article
  15. Deformable elastic network refinement for low-resolution macromolecular crystallography.Acta crystallographica. Section D, Biological crystallography · 2014
    Article
  16. Article
  17. Building a pseudo-atomic model of the anaphase-promoting complex.Acta crystallographica. Section D, Biological crystallography · 2013
    Article
  18. Molecular replacement then and now.Acta crystallographica. Section D, Biological crystallography · 2013
    Review
  19. Article
  20. Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

6 authors.

Axel T BrungerHoward Hughes Medical Institute and Department of Molecular and Cellular Physiology, Stanford University School of Medicine, Stanford, CA 94305, USA. brunger@stanford.edu
Paul D Adams
Petra Fromme
Raimund Fromme
Michael Levitt
Gunnar F Schröder

Funding

PROJECT 5 - DUKE - STRUCTURE VALIDATION AND IMPROVEMENT FOR PROTEINS AND N. ACIDSP01GM063210 · NIGMS · UNIVERSITY OF CALIF-LAWRENC BERKELEY LAB · PI ADAMS, PAUL DAVID · 2001 to 2021
$33.5M
Accurate Molecular Modeling in Structural GenomicsR01GM063817 · NIGMS · STANFORD UNIVERSITY · PI LEVITT, MICHAEL · 2001 to 2016
$5.0M
Femtosecond nano-crystallography of membrane proteinsR01GM095583 · NIGMS · ARIZONA STATE UNIVERSITY-TEMPE CAMPUS · PI FROMME, PETRA · 2010 to 2023
$4.3M
Howard Hughes Medical InstituteNIGMS NIH HHS GM063817NIGMS NIH HHS P01 GM063210NIGMS NIH HHS P01GM063210NIGMS NIH HHS R01 GM063817NIGMS NIH HHS R01 GM095583
6 · The paper itself

Abstract

In X-ray crystallography, molecular replacement and subsequent refinement is challenging at low resolution. We compared refinement methods using synchrotron diffraction data of photosystem I at 7.4 Å resolution, starting from different initial models with increasing deviations from the known high-resolution structure. Standard refinement spoiled the initial models, moving them further away from the true structure and leading to high R(free)-values. In contrast, DEN refinement improved even the most distant starting model as judged by R(free), atomic root-mean-square differences to the true structure, significance of features not included in the initial model, and connectivity of electron density. The best protocol was DEN refinement with initial segmented rigid-body refinement. For the most distant initial model, the fraction of atoms within 2 Å of the true structure improved from 24% to 60%. We also found a significant correlation between R(free) values and the accuracy of the model, suggesting that R(free) is useful even at low resolution.

Indexed as

Models, MolecularBacterial ProteinsCrystallography, X-RayPhotosystem I Protein ComplexProtein Structure, SecondaryProtein Structure, TertiarySoftwareStructural Homology, ProteinBacterial ProteinsPhotosystem I Protein Complex

Identifiers

PMID22681901
PMCPMC3380535

What OpenQuestion holds

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Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.