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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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Cytoskeletal filaments are polymeric forms of smaller protein subunits. However, individual cytoskeletal filaments may easily disassemble or associate with other similar filaments to form rigid structures. Microfilaments, made of actin monomers, rely on actin-binding proteins to form bundles and create networks of individual actin filaments. Microtubules rely on microtubule-associated proteins (MAPs) to form sturdy cylindrical structures. However, the proteins involved in forming complex...
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Microtubule Anchoring: Attaching Dynamic Polymers to Cellular Structures.

Chithran Vineethakumari1, Jens Lüders1

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Frontiers in Cell and Developmental Biology
|March 21, 2022
PubMed
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Microtubule organizing centers (MTOCs) anchor newly formed microtubules, a process less understood than nucleation. This review explores microtubule anchoring mechanisms and their cellular consequences.

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Area of Science:

  • Cell Biology
  • Cytoskeleton Dynamics
  • Molecular Motors

Background:

  • Microtubules are essential cytoskeletal polymers crucial for intracellular transport and cell division.
  • Microtubule organizing centers (MTOCs) are critical for generating organized microtubule arrays.
  • MTOCs perform both microtubule nucleation and anchoring, but anchoring mechanisms remain poorly understood.

Purpose of the Study:

  • To review the mechanistic challenges of microtubule anchoring at MTOCs.
  • To discuss the molecular factors involved in microtubule anchoring.
  • To explore the cellular and organismal consequences of defective microtubule anchoring.

Main Methods:

  • Literature review and synthesis of existing research on microtubule organization.
  • Analysis of known and proposed molecular players in microtubule anchoring.
  • Discussion of cellular phenotypes associated with impaired microtubule anchoring.

Main Results:

  • Microtubule nucleation is well-characterized (mediated by γ-tubulin ring complex).
  • Microtubule anchoring mechanisms and factors are less defined.
  • Defective anchoring can lead to significant cellular and organismal defects.

Conclusions:

  • Understanding microtubule anchoring is crucial for comprehending cell organization and function.
  • Further research is needed to elucidate the molecular machinery of microtubule anchoring.
  • Defects in anchoring highlight its importance in maintaining cellular homeostasis and organismal development.