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Microtubules are thick hollow cylindrical proteins that help form the cytoskeleton. Microtubules have varied roles in the cell. These filaments help form cellular appendages like cilia and flagella, which are responsible for locomotion. The cilia arise from basal bodies, separated from the main body by a membrane-like structure forming the transition zone. This zone is the gate for the entry of lipids and proteins, creating a unique composition of lipids and proteins in the ciliary membrane and...
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Related Experiment Video

Updated: Mar 12, 2026

Applying Live Cell Imaging and Cryo-Electron Tomography to Resolve Spatiotemporal Features of the Legionella pneumophila Dot/Icm Secretion System
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Molecular Models for the Core Components of the Flagellar Type-III Secretion Complex.

William R Taylor1, Teige R S Matthews-Palmer1,2, Morgan Beeby2

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Summary

Computational methods generated consistent 3D molecular models for type-III secretion system proteins. These models aid in interpreting experimental data where high-resolution structures are unavailable.

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Area of Science:

  • Structural biology
  • Microbiology
  • Computational biophysics

Background:

  • The type-III secretion system (T3SS) is crucial for bacterial pathogenesis.
  • High-resolution structural data for core T3SS proteins is largely absent.
  • Understanding T3SS protein structures is vital for developing novel antimicrobial strategies.

Purpose of the Study:

  • To develop consistent three-dimensional molecular models for core type-III secretion system proteins.
  • To reconcile disparate and inconsistent experimental data into coherent structural models.
  • To provide structural insights aiding experimental interpretation in the absence of high-resolution structures.

Main Methods:

  • Utilized a combination of computational methods.
  • Integrated diverse and sometimes conflicting data sources.
  • Applied constraint-based modeling to determine protein structures.

Main Results:

  • Generated consistent 3D molecular models for most core T3SS proteins.
  • Identified unique structural solutions for proteins like FliQ.
  • Encountered and analyzed uncertainties in models for FlhA and FliP due to protein size and complex helix packing.

Conclusions:

  • The proposed computational models offer valuable structural hypotheses for T3SS proteins.
  • These models can assist in interpreting electron microscopy images and mutation data.
  • The study highlights the challenges and successes in modeling large, complex bacterial secretion system components.