The molecular interaction of six single-stranded DNA aptamers to cardiac troponin I revealed by docking and molecular dynamics simulation

• Published in: PLOS ONE Vol. 19; no. 5; p. e0302475
• Main Authors: Ropii, Bejo, Bethasari, Maulidwina, Anshori, Isa, Koesoema, Allya Paramita, Shalannanda, Wervyan, Satriawan, Ardianto, Setianingsih, Casi, Akbar, Mohammad Rizki, Aditama, Reza, Fahmi, Fahmi, Sutanto, Erwin, Yazid, Muhammad, Aziz, Muhammad
• Format: Journal Article
• Language: English
• Published: United States Public Library of Science (PLoS) 15.05.2024; Public Library of Science
• Subjects: Acute coronary syndromes; Antibodies; Aptamers; Aptamers, Nucleotide - chemistry; Aptamers, Nucleotide - metabolism; Biological markers; Biology and Life Sciences; Biomarkers; Boats and boating; Cardiovascular diseases; Cardiovascular research; Chemical modification; Complex formation; Deoxyribonucleic acid; Diagnosis; DNA; DNA, Single-Stranded - chemistry; DNA, Single-Stranded - metabolism; Energy; Force and energy; Genetic research; Heart attack; Heart diseases; High temperature; Humans; Hydrogen; Hydrogen Bonding; Hydrogen bonds; Hydrophobicity; Ischemia; Ligands; Medicine; Molecular docking; Molecular Docking Simulation; Molecular dynamics; Molecular Dynamics Simulation; Molecular interactions; Myocardial infarction; Nucleic acid aptamers; Physical Sciences; Protein Binding; Proteins; Q; R; Reagents; Research Article; RNA; Science; Simulation; Single-stranded DNA; Stability; Thermodynamics; Troponin I; Troponin I - chemistry; Troponin I - metabolism; Viral antibodies; Indonesia
• ISSN: 1932-6203; 1932-6203
• DOI: 10.1371/journal.pone.0302475

Cardiac troponin I (cTnI) is a cardiac biomarker for diagnosing ischemic heart disease and acute myocardial infarction. Current biochemical assays use antibodies (Abs) due to their high specificity and sensitivity. However, there are some limitations, such as the high-cost production of Abs due to complex instruments, reagents, and steps; the variability of Abs quality from batch to batch; the low stability at high temperatures; and the difficulty of chemical modification. Aptamer overcomes the limitations of antibodies, such as relatively lower cost, high reproducibility, high stability, and ease of being chemically modified. Aptamers are three-dimensional architectures of single-stranded RNA or DNA that bind to targets such as proteins. Six aptamers (Tro1-Tro6) with higher binding affinity than an antibody have been identified, but the molecular interaction has not been studied. In this study, six DNA aptamers were modeled and docked to cTnI protein. Molecular docking revealed that the interaction between all aptamer and cTnI happened in the similar cTnI region. The interaction between aptamer and cTnI involved hydrophobic interaction, hydrogen bonds, π -cation interactions, π -stack interactions, and salt-bridge formation. The calculated binding energy of all complexes was negative, which means that the complex formation was thermodynamically favorable. The electrostatic energy term was the main driving force of the interaction between all aptamer and cTnI. This study could be used to predict the behavior of further modified aptamer to improve aptamer performance.