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Related Concept Videos

Assembly of Complex Microtubule Structures01:32

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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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Microtubules are the thickest cytoskeletal filaments with a diameter of 25 nm. In prokaryotic organisms, microtubules are commonly found in locomotory appendages like cilia and flagella. In eukaryotic cells, microtubules form specialized extensions for moving fluid over the surface, like those found in cells lining the intestine.
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Microtubule function and architecture are regulated by an array of specialized proteins called microtubule-associated proteins or MAPs. These proteins are widespread across different organisms and have conserved protein motifs, like the multi-TOG domain for tubulin binding found in the CLASP family of MAPs. Some MAPs are lineage-specific based on their conserved domains. Their functions depend upon the cytoskeletal architecture and cell type they are located within. In-plant cells, a specific...
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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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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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Variable microtubule architecture in the malaria parasite.

Josie L Ferreira1,2,3,4, Vojtěch Pražák1,2,5, Daven Vasishtan1,2,5

  • 1Centre for Structural Systems Biology, Hamburg, Germany.

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Plasmodium falciparum, the malaria parasite, exhibits unique microtubule structures across its life cycle. These diverse cytoskeletal arrangements, unlike canonical forms, suggest specialized functions in different parasite stages.

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Area of Science:

  • Cell Biology
  • Parasitology
  • Structural Biology

Background:

  • Microtubules form a fundamental eukaryotic cytoskeleton, typically with 13 protofilaments in a hollow cylinder.
  • This canonical structure is conserved across most organisms, with few exceptions.
  • Plasmodium falciparum, the malaria parasite, presents an opportunity to study cytoskeletal variations.

Purpose of the Study:

  • To investigate the structural diversity of microtubules in Plasmodium falciparum throughout its life cycle.
  • To understand the implications of non-canonical microtubule structures in parasite biology.
  • To identify unique microtubule organizing centers in different parasite forms.

Main Methods:

  • In situ electron cryo-tomography was employed to visualize microtubule structures.
  • Subvolume averaging was used to analyze high-resolution tomographic data.
  • Microtubule protofilament numbers and arrangements were quantified in different parasite stages.

Main Results:

  • Canonical 13 protofilament microtubules were observed in merozoites.
  • Migrating mosquito forms showed reinforced 13 protofilament structures with interrupted luminal helices.
  • Gametocytes displayed a wide range of microtubule structures, including 13-18 protofilaments, doublets, and triplets.

Conclusions:

  • Plasmodium falciparum possesses a highly unusual and diverse microtubule cytoskeleton.
  • Distinct microtubule structures correlate with different life cycle stages, suggesting specialized functions.
  • This structural plasticity offers insights into the biology of this significant human pathogen.