Related Experiment Video

Updated: Sep 12, 2025

Identification of Kinase-substrate Pairs Using High Throughput Screening
11:13

Identification of Kinase-substrate Pairs Using High Throughput Screening

Published on: August 29, 2015

8.3K

Decoding the language of PLK1 docking motifs and activation mechanisms

Arianna Esposito-Verza1, Andrea Musacchio1, Duccio Conti2

  • 1Department of Mechanistic Cell Biology, Max Planck Institute of Molecular Physiology, Otto-Hahn-Straße 11, 44227 Dortmund, Germany; Centre for Medical Biotechnology, Faculty of Biology, University Duisburg-Essen, Essen, Germany.

Trends in Cell Biology
|August 9, 2025
PubMed

Insights

Polo-like kinase 1 (PLK1) regulates cell division through phosphorylation. New research suggests docking sites and noncanonical motifs initiate PLK1 activation, enabling localized phosphorylation spreading during mitosis.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Polo-like kinase 1 (PLK1) is a crucial regulator of cell cycle events, including mitosis and cytokinesis.
  • PLK1 controls numerous substrates essential for processes like chromosome condensation, spindle assembly, and nuclear envelope breakdown.
  • The precise spatial and temporal regulation of PLK1 activity, and its interplay with phosphatases (PP1, PP2A), remains poorly understood.

Purpose of the Study:

  • This review focuses on the key unknowns in human PLK1 regulation.
  • It explores the emerging concept of master docking sites in PLK1 activation.
  • The review investigates how noncanonical motifs contribute to localized PLK1 activation and phosphorylation spreading.

Main Methods:

  • This is a review article, synthesizing existing research.
  • It focuses on theoretical and conceptual frameworks of PLK1 regulation.
  • Analysis of published data on PLK1 substrates, activators, and localization.

Main Results:

  • Emerging evidence points to master docking sites as initiators of PLK1 activity.
  • Newly discovered noncanonical motifs play a role in PLK1 recruitment and activation.
  • Initial local PLK1 activation promotes a spreading of phosphorylation to nearby substrates.

Conclusions:

  • Understanding PLK1 regulation is critical for comprehending cell cycle control.
  • Docking sites and noncanonical motifs represent a key mechanism for localized PLK1 activation.
  • This localized activation model provides insights into the spatial control of mitotic phosphorylation.
Keywords:
Aurora ABoraPolo-like kinase 1activation loopcentrosomechromosome segregationkinetochore

More Related Videos

Characterization at the Molecular Level using Robust Biochemical Approaches of a New Kinase Protein11:23

Characterization at the Molecular Level using Robust Biochemical Approaches of a New Kinase Protein

Published on: June 30, 2019

6.3K
Studying RNA Interactors of Protein Kinase RNA-Activated during the Mammalian Cell Cycle10:05

Studying RNA Interactors of Protein Kinase RNA-Activated during the Mammalian Cell Cycle

Published on: March 5, 2019

6.6K

Related Concept Videos

Cytoskeletal Linker Proteins - Plakins01:09

Cytoskeletal Linker Proteins - Plakins

Plakins are large proteins with binding domains for microtubules, microfilaments, intermediate filaments, and membrane-associated protein complexes at cell junctions. Plakin functions are evolutionarily conserved and are primarily involved in organizing the different components of the cytoskeleton by crosslinking them to each other and connecting them to the cell-matrix and cell adhesion complexes. They are also known to interact with signal transducers, serve as scaffolds for signaling...
2.4K
Assembly of Signaling Complexes01:30

Assembly of Signaling Complexes

Multiprotein signaling complexes are formed in a dynamic process involving protein-protein interactions at the cytoplasmic domain of transmembrane receptors or enzymatic and non-enzymatic proteins associated with the receptor. These complexes ensure the activation and propagation of intracellular signals that regulate cell functions.
Interaction domains in cell signaling
Interaction domains recognize exposed features of their binding partners containing post-translationally modified sequences,...
5.9K
The JAK-STAT Signaling Pathway01:20

The JAK-STAT Signaling Pathway

Several cytokine receptors have tightly bound Janus kinase or JAK proteins attached at their cytosolic tail. Small signaling molecules such as cytokines, growth hormones, or prolactins bind to the cytokine receptors and initiate their dimerization. The dimerization brings the cytosolic JAKs together that trans-phosphorylate and activates each other. The activated JAKs now phosphorylate cytosolic tails of the cytokine receptors, which serve as binding sites for adaptor proteins such as  SH2...
9.2K
PI3K/mTOR/AKT Signaling Pathway01:22

PI3K/mTOR/AKT Signaling Pathway

The mammalian target of rapamycin  (mTOR) is a serine/threonine kinase that regulates growth, proliferation, and cell survival in response to hormones, growth factors, or nutrient availability. This kinase exists in two structurally and functionally distinct forms: mTOR complex 1  (mTORC1) and mTOR complex 2  (mTORC2). The first form (mTORC1) is composed of a rapamycin-sensitive Raptor and proline-rich Akt substrate, PRAS40. In contrast,  mTORC2 consists of a...
4.0K
Amplifying Signals via Enzymatic Cascade01:22

Amplifying Signals via Enzymatic Cascade

When a ligand binds to a cell-surface receptor, the receptor's intracellular domain changes shape, which may either activate its enzyme function or allow its binding to other molecules. The initial signal is amplified by most signal transduction pathways. This means that a single ligand molecule can activate multiple molecules of a downstream target. Proteins that relay a signal are most commonly phosphorylated at one or more sites, activating or inactivating the protein. Kinases catalyze...
8.7K
Phosphoinositides and PIPs01:42

Phosphoinositides and PIPs

Phosphoinositides are a group of phospholipids containing a glycerol backbone with two fatty acid chains and a phosphate attached to a myoinositol sugar ring. The inositol head group extends into the cytoplasm, where it is modified by adding phosphate groups to form phosphatidylinositol phosphates or PIPs.
Different phosphoinositides are synthesized and recruited on the cytosolic face of the plasma membrane. The localization of specific phosphoinositides concentrated in separate membrane...
8.7K