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Related Concept Videos

Centrosome Duplication02:25

Centrosome Duplication

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The primary microtubule organizing center (MTOC) in animal cells is the centrosome. A centrosome has two cylindrical centrioles at its core. Each centriole consists of nine sets of three microtubules held together by proteins. The centrioles are positioned at right angles to each other and surrounded by a shapeless protein cloud called the pericentriolar matrix, or pericentriolar material (PCM).
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Most animal cells comprise a pair of centrioles together called a centrosome. The cell duplicates its centrosome and contains two centrosomes side-by-side, which begin to move apart during the prophase. As the centrosomes migrate to two different sides of the cell, microtubules start extending from each centrosome toward the other end. The mitotic spindle is composed of the centrosomes and their emerging microtubules.
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Spindle assembly occurs through three, often coexisting, pathways – the centrosome-mediated pathway, the chromatin-mediated pathway, and the microtubule-mediated pathway – collectively contributing to form a robust spindle apparatus.
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Histone variants are the histone proteins with structural and sequence variations. These variants may be regarded as “mutant” forms that replace their canonical histone counterparts in the nucleosomes. Specific post-translational modifications on the histone variants enable further chromatin complexity and regulate tissue-specific gene expression. The most common histone variants are from histone H2A, H2B, and linker histone H1 families. However, several variants of histone H3...
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In vitro reconstitution of minimal human centrosomes.

Manolo U Rios1, Weronika E Stachera1, Nicole E Familiari1

  • 1Dept. of Cell Biology, UT Southwestern Medical Center, Dallas, TX 75390, USA.

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Summary

Centrosome protein CDK5RAP2/CEP215 forms scaffolds that recruit and activate microtubule nucleators. This minimal system, essential for human centrosome assembly, aids in studying cancer cell biology.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • The pericentriolar material (PCM) protein CDK5RAP2/CEP215 is crucial for recruiting microtubule-nucleating factors to human centrosomes.
  • Understanding centrosome assembly is vital for comprehending cell division and diseases like cancer.

Purpose of the Study:

  • To reconstitute human centrosome assembly *in vitro* using CDK5RAP2.
  • To investigate the role of CDK5RAP2 in recruiting and activating gamma tubulin ring complexes (γ-TuRCs).
  • To explore the function of CDK5RAP2 scaffolds in microtubule nucleation and centrosome amplification.

Main Methods:

  • Utilized an *in vitro* reconstitution system with purified proteins.
  • Investigated the role of the F75 residue in CDK5RAP2 function.
  • Analyzed the recruitment and activity of γ-TuRCs and microtubule polymerization.
  • Examined the effect of the molecular motor KifC1/HSET on CDK5RAP2 assemblies.

Main Results:

  • CDK5RAP2 self-assembled into micron-scale scaffolds around a nanometer-scale nucleator in a PLK-1-dependent manner.
  • These scaffolds recruited and activated γ-TuRCs, leading to microtubule aster formation with α/β tubulin.
  • The F75 residue in CDK5RAP2 was essential for γ-TuRC activation, though only partially required for recruitment.
  • The reconstituted system mimicked key aspects of centrosome amplification observed in cancer cells.
  • CDK5RAP2 scaffolds selectively recruited KifC1/HSET, promoting microtubule polymerization and assembly clustering.

Conclusions:

  • CDK5RAP2 is sufficient to form functional scaffolds that drive key aspects of centrosome assembly *in vitro*.
  • A minimal set of components, including CDK5RAP2, nucleators, and γ-TuRCs, are required for human centrosome function.
  • This *in vitro* model provides a powerful tool for studying centrosome biology and its role in human diseases.