egfr activator  (MedChemExpress)

Journal: Pharmaceuticals

Article Title: Synthesis, Antitumor Activities, and Apoptosis-Inducing Activities of Schiff’s Bases Incorporating Imidazolidine-2,4-dione Scaffold: Molecular Docking Studies and Enzymatic Inhibition Activities

doi: 10.3390/ph18040496

Figure Lengend Snippet: Summary of in vitro evaluation of compounds 10, 13, 21 , and 24 .

Article Snippet: EGFR and HER2 kinase inhibitory activities were determined based on the manufacturer’s guidelines (EGFR Kinase Assay Kit Catalog no. 40321 and HER2 Kinase Assay Kit Catalog no. 40721, BPS Bioscience, San Diego, CA).

Techniques: In Vitro, Inhibition

Journal: Pharmaceuticals

Article Title: Synthesis, Antitumor Activities, and Apoptosis-Inducing Activities of Schiff’s Bases Incorporating Imidazolidine-2,4-dione Scaffold: Molecular Docking Studies and Enzymatic Inhibition Activities

doi: 10.3390/ph18040496

Figure Lengend Snippet: Overlay of the redocked (green) and co-crystallized ligand 03Q (yellow) within the HER2 binding site ( A ) and the redocked ligand (green) and co-crystallized ligand Gefitinib (yellow) within the EGFR binding site ( B ). The close alignment of the redocked and co-crystallized ligands validates the docking protocol and confirms the reliability of the binding pose predictions.

Article Snippet: EGFR and HER2 kinase inhibitory activities were determined based on the manufacturer’s guidelines (EGFR Kinase Assay Kit Catalog no. 40321 and HER2 Kinase Assay Kit Catalog no. 40721, BPS Bioscience, San Diego, CA).

Techniques: Binding Assay

Journal: Pharmaceuticals

Article Title: Synthesis, Antitumor Activities, and Apoptosis-Inducing Activities of Schiff’s Bases Incorporating Imidazolidine-2,4-dione Scaffold: Molecular Docking Studies and Enzymatic Inhibition Activities

doi: 10.3390/ph18040496

Figure Lengend Snippet: Three-dimensional representation of the HER2 (PDB code: 3PP0) binding site showing compound 24 (depicted in green) in juxtaposition to the co-crystalline ligand (03Q) colored in yellow. The spatial orientations provide insights into their respective interactions and alignments within the active site.

Article Snippet: EGFR and HER2 kinase inhibitory activities were determined based on the manufacturer’s guidelines (EGFR Kinase Assay Kit Catalog no. 40321 and HER2 Kinase Assay Kit Catalog no. 40721, BPS Bioscience, San Diego, CA).

Techniques: Binding Assay

Journal: Pharmaceuticals

Article Title: Synthesis, Antitumor Activities, and Apoptosis-Inducing Activities of Schiff’s Bases Incorporating Imidazolidine-2,4-dione Scaffold: Molecular Docking Studies and Enzymatic Inhibition Activities

doi: 10.3390/ph18040496

Figure Lengend Snippet: Molecular docking interactions of compound 24 with HER2 kinase domain (PDB code: 3PP0) and EGFR kinase domain (PDB code: 2ITY). The table delineates the specific interactions between the ligand atoms and both HER2 and EGFR residues separately, including the type of interaction, distance, and estimated binding energy.

Article Snippet: EGFR and HER2 kinase inhibitory activities were determined based on the manufacturer’s guidelines (EGFR Kinase Assay Kit Catalog no. 40321 and HER2 Kinase Assay Kit Catalog no. 40721, BPS Bioscience, San Diego, CA).

Techniques: Binding Assay

Journal: Pharmaceuticals

Article Title: Synthesis, Antitumor Activities, and Apoptosis-Inducing Activities of Schiff’s Bases Incorporating Imidazolidine-2,4-dione Scaffold: Molecular Docking Studies and Enzymatic Inhibition Activities

doi: 10.3390/ph18040496

Figure Lengend Snippet: The Root Mean Square Deviation (RMSD) analysis of compound 24 and the co-crystallized ligand ( A ) Pro-03Q with HER2 and ( B ) Gefitinib with EGFR over 100 ns molecular dynamics simulations. The RMSD plot reflects the structural stability and conformational changes in the protein–ligand complexes, where compound 24 exhibits a stable binding mode comparable to the reference co-crystallized ligands in both the HER2 and EGFR systems.

Article Snippet: EGFR and HER2 kinase inhibitory activities were determined based on the manufacturer’s guidelines (EGFR Kinase Assay Kit Catalog no. 40321 and HER2 Kinase Assay Kit Catalog no. 40721, BPS Bioscience, San Diego, CA).

Techniques: Binding Assay

Journal: Pharmaceuticals

Article Title: Synthesis, Antitumor Activities, and Apoptosis-Inducing Activities of Schiff’s Bases Incorporating Imidazolidine-2,4-dione Scaffold: Molecular Docking Studies and Enzymatic Inhibition Activities

doi: 10.3390/ph18040496

Figure Lengend Snippet: Root Mean Square Fluctuation (RMSF) analysis of backbone Cα atoms for compound 24 and co-crystallized ligands with ( A ) HER2 and ( B ) EGFR. The RMSF profiles reveal the fluctuation patterns across key structural regions, including the glycine-rich loop, αC helix, and activation loop. Compound 24 shows distinct fluctuation patterns compared with the co-crystallized ligands, indicating differential stabilization effects on the kinase domains.

Article Snippet: EGFR and HER2 kinase inhibitory activities were determined based on the manufacturer’s guidelines (EGFR Kinase Assay Kit Catalog no. 40321 and HER2 Kinase Assay Kit Catalog no. 40721, BPS Bioscience, San Diego, CA).

Techniques: Activation Assay

Journal: Pharmaceuticals

Article Title: Synthesis, Antitumor Activities, and Apoptosis-Inducing Activities of Schiff’s Bases Incorporating Imidazolidine-2,4-dione Scaffold: Molecular Docking Studies and Enzymatic Inhibition Activities

doi: 10.3390/ph18040496

Figure Lengend Snippet: Radius of gyration (Rg) analysis for compound 24 and the co-crystallized ligand in ( A ) HER2 and ( B ) EGFR. The Rg values reflect the compactness and structural stability of the protein–ligand complexes over the 100 ns molecular dynamics simulation. A slight fluctuation in Rg indicates conformational adjustments upon ligand binding, where compound 24 exhibits a more stable and compact structure compared with the co-crystallized ligand in both HER2 and EGFR.

Article Snippet: EGFR and HER2 kinase inhibitory activities were determined based on the manufacturer’s guidelines (EGFR Kinase Assay Kit Catalog no. 40321 and HER2 Kinase Assay Kit Catalog no. 40721, BPS Bioscience, San Diego, CA).

Techniques: Ligand Binding Assay

Journal: Pharmaceuticals

Article Title: Synthesis, Antitumor Activities, and Apoptosis-Inducing Activities of Schiff’s Bases Incorporating Imidazolidine-2,4-dione Scaffold: Molecular Docking Studies and Enzymatic Inhibition Activities

doi: 10.3390/ph18040496

Figure Lengend Snippet: Solvent-Accessible Surface Area (SASA) analysis for compound 24 and co-crystallized ligands with ( A ) HER2 and ( B ) EGFR throughout 100 ns MD simulations. The plot shows the dynamic behavior of the protein–ligand complexes, where compound 24 exhibits reduced the SASA compared with the co-crystallized ligands, indicating tighter binding and potential structural stability in both targets.

Article Snippet: EGFR and HER2 kinase inhibitory activities were determined based on the manufacturer’s guidelines (EGFR Kinase Assay Kit Catalog no. 40321 and HER2 Kinase Assay Kit Catalog no. 40721, BPS Bioscience, San Diego, CA).

Techniques: Solvent, Binding Assay

Journal: Nucleic Acids Research

Article Title: EGFR-mediated HSP70 phosphorylation facilitates PCNA association with chromatin and DNA replication

doi: 10.1093/nar/gkae938

Figure Lengend Snippet: EGFR interacts and phosphorylates HSP70. ( A ) and ( B ) HSP70–EGFR interaction in HCC827 cells. The HSP70–EGFR complex was immunoprecipitated from HCC827 cell lysates using antibodies against HSP70 (panel A) or EGFR (panel B), respectively. The immunoprecipitated HSP70–EGFR complex was analyzed by western blot. ( C ) In vitro EGFR kinase assay detecting Y41 phosphorylation of HSP70. Purified EGFR kinase domain protein was used as the enzyme and purified Flag-tagged HSP70 (WT or Y41F) was used as the protein substrate. HSP70 Y41 phosphorylation was evaluated by western blot using the antibody against Y41 phosphorylated HSP70. ( D ) Enhancement of HSP70 phosphorylation by EGF. HCC827 cells expressing Flag-tagged WT or Y41F HSP70 were untreated or treated with EGF (100 ng/ml, 1 h). The phosphorylation of Flag-tagged HSP70 (WT or Y41F) was analyzed by Co-IP using anti-Flag-tag antibody and western blot using the antibody against Y41 phosphorylated HSP70. ( E ) Inhibition of HSP70 phosphorylation by EGFR–TKIs. HCC827 cells were treated with EGFR–TKIs osimertinib, erlotinib and gefitinib. The status of EGFR phosphorylation, EGFR level, HSP70 phosphorylation and HSP70 level were analyzed by western blot. GADPH was used as the loading control for western blot.

Article Snippet: Active EGFR kinase domain ( N -terminal GST-tagged human EGFR kinase domain, amino acids 696-end) was purchased from Millipore Sigma (Catalog No.: 14–531).

Techniques: Immunoprecipitation, Western Blot, In Vitro, Kinase Assay, Phospho-proteomics, Purification, Expressing, Co-Immunoprecipitation Assay, FLAG-tag, Inhibition, Control