Related Experiment Video

Updated: Jun 29, 2025

Identification of Cyclin-dependent Kinase 1 Specific Phosphorylation Sites by an In Vitro Kinase Assay
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Identification of Cyclin-dependent Kinase 1 Specific Phosphorylation Sites by an In Vitro Kinase Assay

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Recombinant cyclin B-Cdk1-Suc1 capable of multi-site mitotic phosphorylation in vitro

Keishi Shintomi1, Yuki Masahara-Negishi1, Masami Shima1

  • 1Chromosome Dynamics Laboratory, RIKEN Cluster for Pioneering Research, Wako, Saitama, Japan.

Plos One
|March 25, 2024
PubMed

Insights

Researchers developed a new protocol to produce and purify cyclin B-Cdk1 complexes for studying mitosis. This method enables detailed analysis of how cyclin-dependent kinase 1 (Cdk1) controls cell division through multi-site phosphorylation.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • Cyclin-dependent kinase 1 (Cdk1) complexed with cyclin B is crucial for regulating mitosis.
  • The precise mechanisms by which Cdk1-mediated multi-site phosphorylation controls substrate structure and function remain incompletely understood.

Purpose of the Study:

  • To develop an accessible protocol for expressing and purifying recombinant vertebrate cyclin B-Cdk1 complexes.
  • To investigate the substrate specificity and efficiency of the recombinant complex in vitro.
  • To establish a system for recapitulating mitosis-specific phosphorylation events.

Main Methods:

  • Expression of recombinant vertebrate cyclin B and Cdk1 in insect cells using a single baculovirus vector.
  • Purification of cyclin B-Cdk1 complexes to high homogeneity.
  • In vitro phosphorylation assays using artificial and native substrates, including the condensin I complex.
  • Investigation of the role of Suc1 (Cks1 homolog) in modulating phosphorylation activity.

Main Results:

  • A robust protocol for producing homogeneous recombinant cyclin B-Cdk1 complexes was established.
  • The recombinant cyclin B-Cdk1 efficiently and specifically phosphorylated SP and TP motifs.
  • Suc1 was found to accelerate multi-site phosphorylation.
  • Mitosis-specific phosphorylation of the condensin I complex was successfully recapitulated in vitro.

Conclusions:

  • The developed protocol provides a valuable tool for studying Cdk1-mediated phosphorylation during mitosis.
  • This system facilitates biochemical dissection of large-scale phosphorylation events critical for mitotic processes.
  • Further research can leverage this system to elucidate the functional consequences of Cdk1-driven substrate modification.

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