Related Experiment Video

Updated: May 18, 2026

Development of Inhibitors of Protein-protein Interactions through REPLACE: Application to the Design and Development Non-ATP Competitive CDK Inhibitors
10:33

Development of Inhibitors of Protein-protein Interactions through REPLACE: Application to the Design and Development Non-ATP Competitive CDK Inhibitors

Published on: October 26, 2015

Exploring the selectivity of a ligand complex with CDK2/CDK1: a molecular dynamics simulation approach

Sunil Kumar Tripathi1, Sanjeev Kumar Singh, Poonam Singh

  • 1Computer-Aided Drug Designing and Molecular Modeling Lab, Department of Bioinformatics, Alagappa University, Karaikudi-, 630 003 Tamil Nadu, India.

Journal of Molecular Recognition : JMR
|September 22, 2012
PubMed

Insights

Researchers investigated why the ligand BS194 binds strongly to cyclin-dependent kinase 2 (CDK2) but weakly to CDK1. Molecular analysis revealed Leu83 and specific interactions are key to this selectivity, aiding anticancer drug development.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Medicinal Chemistry

Background:

  • Cyclin-dependent kinases (CDKs) regulate cell cycle progression, and their dysregulation is implicated in cancer.
  • CDK inhibitors are a promising avenue for anticancer drug development.
  • Understanding kinase selectivity is crucial for designing effective targeted therapies.

Purpose of the Study:

  • To elucidate the molecular basis for the differential binding affinity of ligand BS194 to CDK2 versus CDK1.
  • To identify key residues and interactions responsible for the observed selectivity.

Main Methods:

  • Homology modeling to construct a three-dimensional model of the CDK1/BS194 complex.
  • Molecular docking and molecular dynamics simulations to analyze binding interactions.
  • Free-energy calculations to quantify binding affinities.

Main Results:

  • Identified Leucine 83 (Leu83) as a critical residue for BS194 recognition, favoring CDK2 binding.
  • Energetic analysis highlighted favorable van der Waals interactions and non-polar solvent contributions.
  • The amine group of BS194 was found to be crucial for selective binding between CDK2 and CDK1.

Conclusions:

  • The study provides a rational explanation for the selectivity of BS194 towards CDK2 over CDK1.
  • Molecular insights gained can guide the design of more potent and selective CDK inhibitors for cancer therapy.

More Related Videos

Analyzing Protein Architectures and Protein-Ligand Complexes by Integrative Structural Mass Spectrometry07:33

Analyzing Protein Architectures and Protein-Ligand Complexes by Integrative Structural Mass Spectrometry

Published on: October 15, 2018

Related Concept Videos

Positive Regulator Molecules02:39

Positive Regulator Molecules

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.
Ligand Binding Sites02:40

Ligand Binding Sites

Proteins are dynamic macromolecules that carry out a wide variety of essential processes; however, the activities of most proteins depend on their interactions with other molecules or ions, known as ligands.
Protein-ligand interactions are quite specific; even though numerous potential ligands surround a cellular protein at any given time, only a particular ligand can bind to that protein. Moreover, a ligand binds only to a dedicated area on the surface of the protein, known as the...
M-Cdk Drives Transition Into Mitosis02:15

M-Cdk Drives Transition Into Mitosis

Checkpoints throughout the cell cycle serve as safeguards and gatekeepers, allowing the cell cycle to progress in favorable conditions and slow or halt it in problematic ones. This regulation is known as the cell cycle control system.
Cyclin-dependent kinases, or Cdks, work in concert with cyclins to control cell cycle transitions. M-Cdk, a complex of Cdk1 bound to M cyclin, is a well-known example of this coordinated control that drives the transition from the G2 to the M phase.
M cyclin...
The Equilibrium Binding Constant and Binding Strength02:18

The Equilibrium Binding Constant and Binding Strength

The equilibrium binding constant (Kb) quantifies the strength of a protein-ligand interaction. Kb can be calculated as follows when the reaction is at equilibrium:
Inhibition of Cdk Activity02:34

Inhibition of Cdk Activity

The orderly progression of the cell cycle depends on the activation of Cdk protein by binding to its cyclin partner. However, the cell cycle must be restricted when undergoing abnormal changes. Most cancers correlate to the deregulated cell cycle, and since Cdks are a central component of the cell cycle, Cdk inhibitors are extensively studied to develop anticancer agents. For instance, cyclin D associates with several Cdks, such as Cdk 4/6, to form an active complex. The cyclin D-Cdk4/6 complex...
Ligand Binding and Linkage00:49

Ligand Binding and Linkage

Allosteric proteins have more than one ligand binding site; the binding of a ligand to any of these sites influences the binding of ligands to the other sites. When a protein is allosteric, its binding sites are called coupled or linked.  In the case of enzymes, the site that binds to the substrate is known as the active site and the other site is known as the regulatory site. When a ligand binds to the regulatory site, this leads to conformational changes in the protein that can influence the...