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The stepwise destruction of specific proteins is necessary for the progression and completion of the cell cycle. Such proteins are ubiquitinated by ubiquitin ligases and then subsequently destroyed by the proteasome. The SCF (Skp1/Cullin/F-box) and the anaphase-promoting complex (APC) are two important ubiquitin ligases involved in cell cycle progression. While SCF is active throughout the cell cycle, APC gets activated during metaphase to anaphase transition. Cdc20 or Cdh1 binds to APC and...
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Calmodulin (CaM) is a calcium-binding protein in eukaryotes that controls various calcium-regulated cellular processes. It has four calcium-binding sites that bind calcium to form the calcium-calmodulin ( Ca2+-CaM) complex. GPCR stimulation increases the calcium levels in the cells that bind to CaM and induces a conformational change.
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Mitotic cell division results in daughter cells that exactly resemble the parent cell. However, errors in the DNA replication or distribution of genetic material may lead to genetic mutations that may be passed down to every new cell formed from the resulting abnormal cell. Propagation of such mutant cells is restricted through checkpoint mechanisms present at different stages of the cell cycle. These checkpoints involve regulator molecules that either promote or demote cell cycle events.
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The addition or removal of phosphate groups from proteins is the most common chemical modification that regulates cellular processes. These modifications can affect the structure, activity, stability, and localization of proteins within cells as well as their interactions with other proteins.
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Related Experiment Video

Updated: Aug 13, 2025

Identification of Cyclin-dependent Kinase 1 Specific Phosphorylation Sites by an In Vitro Kinase Assay
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Phosphosite Scanning reveals a complex phosphorylation code underlying CDK-dependent activation of Hcm1.

Michelle M Conti1, Rui Li1, Michelle A Narváez Ramos1

  • 1Department of Molecular, Cell and Cancer Biology, University of Massachusetts Chan Medical School, Worcester, MA, 01605, USA.

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|January 19, 2023
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Researchers developed Phosphosite Scanning to identify key phosphorylation sites in proteins. This method decodes complex regulatory circuits, revealing how cyclin-dependent kinases control cell cycle progression by regulating factors like Hcm1.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Cyclin-dependent kinases (CDKs) regulate cell cycle progression through substrate phosphorylation.
  • Many CDK substrates have multiple phosphorylation sites within disordered regions, but their functional importance is often unknown.
  • Understanding these multisite phosphorylation events is crucial for deciphering regulatory mechanisms.

Purpose of the Study:

  • To develop a high-throughput method for assessing the functional importance of individual phosphosites within multisite phosphorylated domains.
  • To investigate the regulatory mechanisms of the yeast transcription factor Hcm1, a key regulator of mitotic genes.

Main Methods:

  • Development of a high-throughput approach termed Phosphosite Scanning.
  • Application of Phosphosite Scanning to analyze the phosphorylation of the yeast transcription factor Hcm1.
  • In vivo characterization of CDK-dependent phosphorylation events.

Main Results:

  • Phosphosite Scanning successfully identified combinations of phosphosites regulating protein function.
  • The method revealed specific phosphorylations required for subsequent phosphorylation events within a domain.
  • A complex CDK-regulatory circuit involving Cks1-dependent phosphorylation of Hcm1 was elucidated, detailing Hcm1 activation.

Conclusions:

  • Phosphosite Scanning is a powerful tool for decoding multisite phosphorylated domains.
  • The study illuminates the mechanism of Hcm1 activation by CDKs.
  • This approach provides insights into CDK-mediated regulation of cell cycle progression and gene expression.