Related Experiment Video
Updated: Apr 7, 2026
05:35
Immunofluorescence Analysis of Endogenous and Exogenous Centromere-kinetochore Proteins
Published on: March 3, 2016
15.8K
Method: In vitro analysis of pericentriolar material assembly.
Jeffrey B Woodruff1, Anthony A Hyman1
1Max Planck Institute of Molecular Cell Biology and Genetics, Dresden, Germany.
Methods in Cell Biology
|July 16, 2015
Summary
Researchers developed an in vitro system to study pericentriolar material (PCM) assembly in C. elegans. This system enables detailed investigation into how centrosomes build essential microtubule-organizing centers.
Area of Science:
- Cell Biology
- Molecular Biology
- Developmental Biology
Background:
- Centrosomes are crucial microtubule-organizing centers in eukaryotic cells.
- The pericentriolar material (PCM) surrounding centrioles is vital for centrosome function.
- Understanding PCM assembly mechanisms is limited by the lack of in vitro systems.
Purpose of the Study:
- To establish a novel in vitro system for studying pericentriolar material (PCM) assembly.
- To investigate the mechanisms and regulation of PCM assembly in Caenorhabditis elegans.
Main Methods:
- Expression and purification of key C. elegans PCM proteins (SPD-5, SPD-2, PLK-1) using baculovirus-infected insect cells.
- In vitro assembly of purified proteins into PCM-like structures.
- Development of a semi-automated method for quantifying PCM assembly.
Main Results:
- Successfully generated PCM-like structures in vitro using purified C. elegans proteins.
- Established a quantifiable system to analyze the dynamics of PCM assembly.
- Provided a foundation for detailed mechanistic studies of centrosome assembly.
Conclusions:
- The developed in vitro system is a powerful tool for dissecting PCM assembly.
- This system facilitates future research into centrosome biology and its role in cell division.
- Enables detailed investigation of protein interactions and regulatory mechanisms governing PCM formation.
Keywords:
Caenorhabditis elegansCentrosomeIn vitro reconstitutionPLK-1Pericentriolar materialSPD-2SPD-5More Related Videos
Related Concept Videos
02:50Spindle Assembly
4.5K
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.
In most cells, centrosomes are the primary microtubule nucleation centers. In the centrosome-mediated pathway, the G2-prophase transition triggers centrosome maturation and increased microtubule nucleation. Progressive nucleation results in a...
In most cells, centrosomes are the primary microtubule nucleation centers. In the centrosome-mediated pathway, the G2-prophase transition triggers centrosome maturation and increased microtubule nucleation. Progressive nucleation results in a...
4.5K
01:18Assembly of Cytoskeletal Filaments
28.4K
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...
28.4K
01:13Centrioles and Centrosomes
7.4K
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.
Near the end of the prophase, also called late prophase or...
Near the end of the prophase, also called late prophase or...
7.4K
02:27The Mitotic Spindle
8.4K
The mitotic spindle—or spindle apparatus—is a eukaryotic, cytoskeletal structure made up of long protein fibers called microtubules. Formed during cell division, the spindle separates sister chromatids and moves them to opposite ends of a parental cell, where the now individual chromosomes are distributed to two daughter cell nuclei.
The bipolar configuration of the mitotic spindle facilitates chromosomal segregation, preparing the cell for division. One mechanism that ensures...
The bipolar configuration of the mitotic spindle facilitates chromosomal segregation, preparing the cell for division. One mechanism that ensures...
8.4K
02:30Histone Variants at the Centromere
5.3K
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...
5.3K
02:57Attachment of Sister Chromatids
4.2K
As cells progress into mitosis, the nuclear envelope breaks down, and the condensed chromosomes are exposed to the array of bipolar microtubules of the mitotic spindle. The kinetochore, a large, disc-shaped protein complex, is present at the centromere region of the sister chromatids and acts as a binding site for the microtubules. Usually, the plus-end of a single microtubule is embedded within the kinetochore. However, some kinetochores first establish lateral contact with the side-wall...
4.2K