Related Experiment Video
Updated: Feb 4, 2026
Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR
Published on: December 16, 2013
Structure-guided design of pyridoclax derivatives based on Noxa / Mcl-1 interaction mode
Siham Hedir1, Marcella De Giorgi2, Jade Fogha2
1Normandie Univ, UNICAEN, Inserm U1086 ANTICIPE «Interdisciplinary Research Unit for Cancer Prevention and Treatment», Biology and Innovative Therapeutics for Ovarian Cancers Group (BioTICLA), Centre de Lutte Contre le Cancer F. Baclesse, 3 avenue du Général Harris, 14076, Caen, France; UNICANCER, Centre de Lutte Contre le Cancer F. Baclesse, 3 avenue du Général Harris, 14076, Caen, France.
Abstract:
Protein-protein interactions are attractive targets because they control numerous cellular processes. In oncology, apoptosis regulating Bcl-2 family proteins are of particular interest. Apoptotic cell death is controlled via PPIs between the anti-apoptotic proteins hydrophobic groove and the pro-apoptotic proteins BH3 domain. In ovarian carcinoma, it has been previously demonstrated that Bcl-xL and Mcl-1 cooperate to protect tumor cells against apoptosis. Moreover, Mcl-1 is a key regulator of cancer cell survival and is a known resistance factor to Bcl-2/Bcl-xL pharmacological inhibitors making it an attractive therapeutic target. Here, using a structure-guided design from the oligopyridine lead Pyridoclax based on Noxa/Mcl-1 interaction we identified a new derivative, active at lower concentration as compared to Pyridoclax. This new derivative selectively binds to the Mcl-1 hydrophobic groove and releases Bak and Bim from Mcl-1 to induce cell death and sensitize cancer cells to Bcl-2/Bcl-xL targeting strategies.
Insights
Researchers developed a novel compound targeting Mcl-1, a key protein in ovarian cancer survival. This new derivative selectively binds Mcl-1, inducing cancer cell death and enhancing sensitivity to existing therapies.
Area of Science:
- Oncology
- Molecular Biology
- Drug Discovery
Background:
- Protein-protein interactions (PPIs) regulate critical cellular processes, with Bcl-2 family proteins being key regulators of apoptosis in cancer.
- Mcl-1 is crucial for cancer cell survival and confers resistance to current Bcl-2/Bcl-xL inhibitors, making it a significant therapeutic target.
- In ovarian carcinoma, Bcl-xL and Mcl-1 collaborate to promote tumor cell survival by inhibiting apoptosis.
Purpose of the Study:
- To identify and characterize a novel Mcl-1 inhibitor based on the Pyridoclax scaffold.
- To investigate the mechanism of action of the new derivative, focusing on its interaction with Mcl-1 and its downstream effects on apoptotic proteins.
- To evaluate the potential of the new Mcl-1 inhibitor to sensitize ovarian cancer cells to existing Bcl-2/Bcl-xL targeting strategies.
Main Methods:
- Structure-guided drug design utilizing the Noxa/Mcl-1 interaction as a basis.
- Synthesis and characterization of a new oligopyridine derivative.
- In vitro assays to assess selective binding to the Mcl-1 hydrophobic groove.
- Analysis of the release of Bak and Bim proteins from Mcl-1.
- Evaluation of cell death induction and sensitization to Bcl-2/Bcl-xL inhibitors in cancer cells.
Main Results:
- A novel Mcl-1 inhibitor derivative was identified, demonstrating higher activity at lower concentrations compared to the parent compound Pyridoclax.
- The derivative selectively binds to the Mcl-1 hydrophobic groove.
- This selective binding leads to the release of pro-apoptotic proteins Bak and Bim from Mcl-1.
- The compound effectively induces cancer cell death and sensitizes cells to Bcl-2/Bcl-xL targeting agents.
Conclusions:
- The novel Mcl-1 inhibitor represents a promising therapeutic strategy for ovarian carcinoma.
- Targeting Mcl-1 with this derivative can overcome resistance mechanisms and enhance the efficacy of existing cancer therapies.
- This structure-guided approach provides a new avenue for developing potent and selective Mcl-1 inhibitors for oncology.
Related Concept Videos
01:28Structure-Activity Relationships and Drug Design
SAR studies the intricate relationship between a drug's chemical structure and biological activity. It focuses on understanding how modifications to a drug's structure can influence...
01:28Structures of Carboxylic Acid Derivatives
Carboxylic acid derivatives contain an acyl group attached to a heteroatom such as chlorine, oxygen, or nitrogen. The carbonyl carbon and oxygen are both sp2-hybridized with an unhybridized p orbital.
The three sp2 orbitals of the carbonyl carbon form three σ bonds, one each with the carbonyl oxygen, the α carbon, and the heteroatom, whereas the other two sp2 orbitals of the carbonyl oxygen are occupied by the lone pairs. Further, the unhybridized p...
01:07What is a Mode?
There can be more than one mode in a data set if multiple values have the same highest frequency. For instance, suppose that the Statistics exam scores of 20 students are: 50; 53; 59; 59; 63; 63; 72; 72; 72; 72; 72; 76; 78; 81; 83; 84; 84; 84; 90; 93. Here, the mode is 72, as it occurs most frequently, five times.
A data set with two modes is called bimodal. For example,...
02:01Group Design
01:14Ventilatory Modes
There are three ventilatory modes: full support, partial support, and spontaneous. These are described below.
Full Support Modes
Full support modes include controlled mechanical ventilation, continuous mandatory...
02:01Factorial Design