Related Experiment Video
Updated: May 25, 2026

Quantitative Immunofluorescence Assay to Measure the Variation in Protein Levels at Centrosomes
Published on: December 20, 2014
GCP6 is a substrate of Plk4 and required for centriole duplication
Ramona Bahtz1, Joerg Seidler, Marc Arnold
1Cell Cycle Control and Carcinogenesis, German Cancer Research Center (DKFZ), 69120 Heidelberg, Germany.
Abstract:
Centriole duplication occurs once per cell cycle and requires Plk4, a member of the Polo-like kinase family. A key component of the centrosome is the γ-tubulin ring complex (γ-TuRC) that nucleates microtubules. GCP6 is a member of the γ-TuRC, but its role in human cells and the regulation of its functions remain unclear. Here we report that depletion of human GCP6 prevents assembly of the γ-TuRC and induces a high percentage of monopolar spindles. These spindles are characterized by a loss of centrosomal γ-tubulin and reduced centriole numbers. We found that GCP6 is localized in the pericentriolar material but also at distal portions of centrioles. In addition, GCP6 is required for centriole duplication and Plk4-induced centriole overduplication. GCP6 interacts with and is phosphorylated by Plk4. Moreover, we find that Plk4-dependent phosphorylation of GCP6 regulates centriole duplication. These data suggest that GCP6 is a target of Plk4 in centriole biogenesis.
Related Concept Videos
Centrosome Duplication
To ensure that each daughter cell receives a centrosome after cell division, centrosome duplication...
Centrosome Duplication
To ensure that each daughter cell receives a centrosome after cell division, centrosome duplication...
Centrioles and Centrosomes
Near the end of the prophase, also called late prophase or "prometaphase,"...
S-Cdk Initiates DNA Replication
Two states at the origin of replication
In eukaryotes, the initiation of replication occurs at many sites on the chromosomes, called the origins of replication.
S-Cdk Initiates DNA Replication
Two states at the origin of replication
In eukaryotes, the initiation of replication occurs at many sites on the chromosomes, called the origins of replication.
Cytoskeletal Linker Proteins - Plakins

