Molecular dynamics and docking studies on cardiac troponin C

Area of Science:

• Biochemistry
• Cardiovascular Pharmacology
• Computational Chemistry

Background:

• Cardiac troponin C (cTnC) regulates heart muscle contraction and is a therapeutic target for heart failure.
• Altered cTnC sensitivity due to mutations or pH changes impacts cardiac function.
• Bepridil, a known calcium sensitizer, binds to cTnC but exhibits negative cooperativity.

Purpose of the Study:

• To identify and design novel ligands targeting the N-domain hydrophobic pocket of cardiac troponin C (cNTnC).
• To discover potential drug candidates for heart failure therapy by modulating cTnC function.

Main Methods:

• Virtual screening of the ZINC database using LUDI with specified docking centers and radii.
• De novo design of potential ligands using AUTOLUDI based on initial screening results.
• Molecular dynamics simulations to analyze binding affinity, stability, and interactions of designed ligands.

Main Results:

• Screening identified 8 potential template molecules from the ZINC database.
• De novo design generated 14 novel ligands predicted to fit well into the cNTnC binding pocket.
• Six of the designed ligands demonstrated binding energies, interactions, and complex stabilities comparable to or exceeding those of bepridil.

Conclusions:

• The study successfully identified novel potential ligands for cardiac troponin C.
• These ligands represent promising starting points for developing new therapeutics for heart failure.
• Computational approaches are effective for discovering drug candidates targeting protein-ligand interactions.