Evidence map›Paper›PMID 21690369›Full record

ArticleProceedings of the National Academy of Sciences of the United States of America2011

Structure of Trypanosoma brucei flagellum accounts for its bihelical motion.

Alexey Y Koyfman, Michael F Schmid, Ladan Gheiratmand, Caroline J Fu, Htet A Khant, Dandan Huang, Cynthia Y He, Wah Chiu

Open access · greenAbstract read
In one paragraph

Article in Proceedings of the National Academy of Sciences of the United States of America, 2011. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 44 papers.

0numbers the graph read from it
0cells of the map it votes in
44citing papers in PubMed
3.0field-weighted citation impact, top 9% of its field
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

44 citing papers in PubMed, 72 citations in OpenAlex.

  1. Article
  2. CryoEM structure of thebioRxiv : the preprint server for biology · 2025
    Article
  3. Article
  4. Article
  5. Article
  6. Review
  7. Structure and dynamics of photoreceptor sensory cilia.Pflugers Archiv : European journal of physiology · 2021
    Review
  8. Article
  9. Article
  10. Article
  11. Review
  12. The single flagellum ofJournal of cell science · 2020
    Article
  13. Article
  14. Journal of structural biology: X · 2020
    Article
  15. Article
  16. Defining the layers of a sensory cilium with STORM and cryoelectron nanoscopy.Proceedings of the National Academy of Sciences of the United States of America · 2019
    Article
  17. Article
  18. Veterinary parasitology: X · 2019
    Article
  19. Article
  20. Can microtubule motors use every available track?The Journal of cell biology · 2018
    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

8 authors at 2 institutions in 2 countries.

Alexey Y KoyfmanNational Center for Macromolecular Imaging, Verna and Marrs McLean Department of Biochemistry and Molecular Biology, Baylor College of Medicine, Houston, TX 77030, USA.
Michael F Schmid
Ladan Gheiratmand
Caroline J Fu
Htet A Khant
Dandan Huang
Cynthia Y He
Wah Chiu
Baylor College of Medicine · USNational University of Singapore · SG

Funding

ZERNIKE PHASE PLATE CRYOEM IN OKAZAKIP41RR002250 · NCRR · UNIVERSITY OF ARIZONA · PI CHIU, WAH · 1985 to 2011
$22.1M
RESEARCH TRAINING PROGRAM IN MOLECULAR VIROLOGYT32AI007471 · NIAID · BAYLOR COLLEGE OF MEDICINE · PI RAMIG, ROBERT FRANKLIN · 1996 to 2010
$2.6M
NCRR NIH HHS P41 RR002250NCRR NIH HHS P41RR002250NIAID NIH HHS T32 AI007471NIAID NIH HHS T32 AI07471
6 · The paper itself

Abstract

Trypanosoma brucei is a parasitic protozoan that causes African sleeping sickness. It contains a flagellum required for locomotion and viability. In addition to a microtubular axoneme, the flagellum contains a crystalline paraflagellar rod (PFR) and connecting proteins. We show here, by cryoelectron tomography, the structure of the flagellum in three bending states. The PFR lattice in straight flagella repeats every 56 nm along the length of the axoneme, matching the spacing of the connecting proteins. During flagellar bending, the PFR crystallographic unit cell lengths remain constant while the interaxial angles vary, similar to a jackscrew. The axoneme drives the expansion and compression of the PFR lattice. We propose that the PFR modifies the in-plane axoneme motion to produce the characteristic trypanosome bihelical motility as captured by high-speed light microscope videography.

Indexed as

AnimalsBiophysical PhenomenaCryoelectron MicroscopyFlagellaHumansModels, BiologicalModels, MolecularMovementProtein ConformationProtozoan ProteinsTrypanosoma brucei bruceiparaflagellar rod proteins, Trypanosoma bruceiProtozoan Proteins

Identifiers

PMID21690369
PMCPMC3131312
OpenAlexW2092711570

What OpenQuestion holds

Textmetadata
Read underepoch 390

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.