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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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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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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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Eukaryotic cells have different motor proteins for transporting various cargo within the cell. These motor proteins differ based on the filament they associate with, the direction they move within the cell, and the type of cargo they transport. Motor proteins that associate with microtubules are known as microtubule-associated motor proteins. There are two families of microtubule-associated motor proteins —Kinesins and Dyneins. Both these proteins assist in the transport of cellular...
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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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Decoding microtubule detyrosination: enzyme families, structures, and functional implications.

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The microtubule detyrosination cycle, crucial for cell functions, involves removing and re-ligating α-tubulin tyrosine. Discoveries in vasohibin and carboxypeptidase enzymes clarify this process and its role in diseases.

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Area of Science:

  • Cell Biology
  • Biochemistry
  • Molecular Biology

Background:

  • Microtubules, key cytoskeletal components, undergo numerous post-translational modifications.
  • The microtubule detyrosination cycle, involving α-tubulin tyrosine removal and re-ligation, is implicated in cellular processes and diseases.

Purpose of the Study:

  • To review and summarize the differences and similarities between the vasohibin and microtubule-associated tyrosine carboxypeptidase enzyme families.
  • To discuss the interplay of the detyrosination cycle with other tubulin modifications and functions.

Main Methods:

  • Literature review and comparative analysis of vasohibin and microtubule-associated tyrosine carboxypeptidase enzyme families.
  • Synthesis of current knowledge on the tubulin code and its regulatory mechanisms.

Main Results:

  • Identification and characterization of two distinct enzyme families responsible for microtubule detyrosination.
  • Elucidation of the enzymatic mechanisms underlying α-tubulin detyrosination and re-tyrosination.

Conclusions:

  • The discovery of these enzyme families provides critical insights into the regulation of the microtubule cytoskeleton.
  • Understanding the detyrosination cycle's interplay with the tubulin code is essential for comprehending its roles in health and disease.