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Related Concept Videos

Assembly of Complex Microtubule Structures01:32

Assembly of Complex Microtubule Structures

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Complex microtubule structures are present in resting cells and in dividing cells. In resting cells, they are responsible for maintaining the cellular architecture, tracks for intracellular transport, positioning of organelles, assembly of cilia and flagella. They mediate the bipolar spindle assembly for chromosomal segregation and positioning of the cell division plate in dividing cells. The formation of microtubule complex structures depends on the cell type, cell stage, and cell function.
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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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There are three types of cytoskeletal structures in eukaryotic cells—microfilaments, intermediate filaments, and microtubules. With a diameter of about 25 nm, microtubules are the thickest of these fibers. Microtubules carry out a variety of functions that include cell structure and support, transport of organelles, cell motility (movement), and the separation of chromosomes during cell division.
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Microtubules are dynamic structures that undergo continuous assembly and disassembly. They originate from specialized multi-protein complexes known as microtubule organizing centers or MTOCs. Within the MTOC, the point of origin of the microtubule is known as the minus end, while the end radiating outward is the plus end. Microtubules serve two primary functions — the organization of spindle complexes to separate sister chromatids during mitotic or meiotic cell division and the formation...
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Microtubules are hollow cylindrical filaments having a diameter of approximately 25 nm and a length that varies from 200 nm to 25 μm. GTP-bound tubulin subunits form αβ-heterodimers for microtubule assembly. These core building blocks interact longitudinally, polymerizing into protofilaments. The protofilaments then interact with one another through lateral bonding forces to form stable cylindrical microtubules. These cylindrical filaments are dynamic as they undergo repeated...
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The destabilization of microtubules can occur during different stages of the microtubule lifecycle, such as nucleation or elongation. It can take place at either end of the microtubule or in the microtubule lattices as a whole. The lifespan of individual microtubules within a cell varies according to the cell type and stage of the cell cycle. During interphase, the lifespan of the microtubule is about 30 minutes, while during cell division, it is about 15 minutes. In axonal microtubules of...
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Self-Assembly of Microtubule Tactoids
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Parasite microtubule arrays.

Josie L Ferreira1, Friedrich Frischknecht2

  • 1Institute of Structural and Molecular Biology, Birkbeck, University of London, London, UK.

Current Biology : CB
|August 22, 2023
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Parasitic microbes utilize unique microtubule structures for survival and reproduction. Studying these distinct cellular mechanisms in parasites offers insights into cell biology and potential therapeutic targets for diseases.

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Area of Science:

  • Cell Biology
  • Parasitology
  • Biochemistry

Background:

  • Microtubules are essential for eukaryotic cell structure and function, including cell shape, motility, and chromosome segregation.
  • Parasites exhibit diverse and often unique biological adaptations, including specialized microtubule usage, to thrive in various hosts and environments.
  • Understanding parasite cell biology is crucial for appreciating biodiversity and developing novel therapeutics against parasitic diseases.

Purpose of the Study:

  • To highlight the distinctive microtubule arrays and molecular features in medically important, single-celled human parasites.
  • To explore how parasites have adapted and reinvented microtubule functions for their survival and complex life cycles.
  • To underscore the potential of parasite cell biology research in uncovering new therapeutic targets.

Main Methods:

  • Review and discussion of existing literature on parasite microtubule structures.
  • Comparative analysis of microtubule organization in selected human-infecting protozoan parasites.
  • Identification of unique molecular components and cellular mechanisms related to parasite microtubules.

Main Results:

  • Parasites display a remarkable diversity in microtubule arrays, deviating significantly from typical eukaryotic patterns.
  • Specific parasitic organisms possess unique cytoskeletal structures and organellar compositions related to microtubule function.
  • Distinct molecular features governing microtubule dynamics and organization have been identified in various parasites.

Conclusions:

  • The study of parasite microtubules reveals fascinating evolutionary adaptations and provides a model for understanding cellular diversification.
  • Unique microtubule arrays in parasites represent promising targets for the development of urgently needed antiparasitic drugs.
  • Further research into parasite cell biology holds significant potential for both fundamental scientific discovery and therapeutic breakthroughs.