Evidence map›Paper›PMID 31063153›Full record

ArticleActa crystallographica. Section D, Structural biology2019

Analysis and validation of macromolecular B values.

Rafiga C Masmaliyeva, Garib N Murshudov

Abstract read
In one paragraph

Article in Acta crystallographica. Section D, Structural biology, 2019. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 16 papers.

0numbers the graph read from it
0cells of the map it votes in
16citing 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

16 citing papers in PubMed.

  1. Article
  2. Measurement of atomic scattering factors by cryoelectron microscopy.Proceedings of the National Academy of Sciences of the United States of America · 2026
    Article
  3. Article
  4. Article
  5. Article
  6. Article
  7. Toward Real Real-Space Refinement of Atomic Models.International journal of molecular sciences · 2022
    Article
  8. Article
  9. Article
  10. B-factor accuracy in protein crystal structures.Acta crystallographica. Section D, Structural biology · 2022
    Article
  11. Article
  12. Article
  13. The accuracy of protein models automatically built into cryo-EM maps with ARP/wARP.Acta crystallographica. Section D, Structural biology · 2021
    Article
  14. Article
  15. Local and global analysis of macromolecular atomic displacement parameters.Acta crystallographica. Section D, Structural biology · 2020
    Article
  16. Crystallization and structure of ebselen bound to Cys141 of human inositol monophosphatase.Acta crystallographica. Section F, Structural biology communications · 2020
    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

2 authors.

Rafiga C MasmaliyevaInstitute of Molecular Biology and Biotechnology ANAS, Matbuat Avenue 2a, Baku 1073, Azerbaijan.
Garib N MurshudovMRC Laboratory of Molecular Biology, Francis Crick Avenue, Cambridge CB2 0QH, England.ORCID 0000-0001-6483-3587

Funding

Medical Research Council MC_UP_A025_1012Medical Research Council MC_US_A025_0104
6 · The paper itself

Abstract

This paper describes a global analysis of macromolecular B values. It is shown that the distribution of B values generally follows the shifted inverse-gamma distribution (SIGD). The parameters of the SIGD are estimated using the Fisher scoring technique with the expected Fisher information matrix. It is demonstrated that a contour plot based on the parameters of the SIGD can play a role in the validation of macromolecular structures. The dependence of the peak-height distribution on resolution and atomic B values is also analysed. It is demonstrated that the B-value distribution can have a dramatically different effect on peak heights at different resolutions. Consequently, a comparative analysis of the B values of neighbouring atoms must account for resolution. A combination of the SIGD, peak-height distribution and outlier detection was used to identify a number of entries from the PDB that require attention. It is also shown that the presence of a multimodal B-value distribution often indicates that some loops or parts of the molecule have either been mismodelled or have dramatically different mobility, depending on their environment within the crystal. These distributions can also indicate the level of sharpening/blurring used before atomic structure refinement. It is recommended that procedures such as sharpening/blurring should be avoided during refinement, although they can play important roles in map visualization and model building.

Indexed as

Gamma RaysProtein ConformationSoftwareCrystallography, X-RayMacromolecular SubstancesModels, MolecularMacromolecular SubstancesB valuesinverse-gamma distributionmacromolecular structuresmaximum-likelihood estimation

Identifiers

PMID31063153
PMCPMC6503761

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Registered trials

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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.