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Bacterial cells were initially considered simple, randomly organized structures lacking a cytoskeleton. However, the discovery of cytoskeleton homologs in bacteria led to the change of this opinion. Bacterial cytoskeletal filaments regulate the cell shape, cell polarity, cell division, and partitioning of plasmids during cell division. It was later discovered that bacterial cytoskeletal proteins, mainly actin and tubulin homologs, are diverse compared to their eukaryotic counterparts. On the...
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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 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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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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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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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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Tubulin isotypes - functional insights from model organisms.

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Understanding alpha- and beta-tubulin isotypes is key to microtubule function. Studying these tubulin isotypes across diverse organisms reveals fundamental mechanisms and functional diversity in the cytoskeleton.

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Area of Science:

  • Cell Biology
  • Cytoskeleton Dynamics
  • Molecular Genetics

Background:

  • Microtubules are essential cytoskeletal components built from alpha- and beta-tubulin heterodimers.
  • Most eukaryotes possess multiple tubulin isotypes, but their specific roles remain largely undefined.
  • Tubulinopathies, diseases linked to tubulin gene mutations, highlight the importance of these proteins.

Purpose of the Study:

  • To review the roles of alpha- and beta-tubulin isotypes in microtubule function.
  • To explore how studying tubulin isotypes in model organisms advances our understanding.
  • To connect isotype function to the mechanisms underlying tubulinopathies and cytoskeletal diversity.

Main Methods:

  • Literature review focusing on research utilizing model organisms (yeast, fruit fly, nematode, mouse).
  • Analysis of studies investigating the functional specialization of different tubulin isotypes.
  • Synthesis of findings on the link between tubulin isotype variations and disease.

Main Results:

  • Model organisms provide distinct advantages for dissecting tubulin isotype functions, from yeast's mechanistic insights to complex organisms' tissue-specific roles.
  • Comparative studies reveal that distinct tubulin isotypes contribute to specialized microtubule functions.
  • Understanding isotype roles is crucial for comprehending the molecular basis of tubulinopathies.

Conclusions:

  • Investigating tubulin isotypes across a spectrum of organisms is essential for elucidating fundamental microtubule assembly and function.
  • This approach offers critical insights into the molecular mechanisms driving cytoskeletal diversity and associated diseases.