Trans-Sialidase’s Role in Chronic Chagas Disease, and it’s Potential for Infection Inhibition by Employing Natural Products National Taiwan University.

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Chronic Chagas Disease and Potential Natural Products

Presentation transcript:

Trans-Sialidase’s Role in Chronic Chagas Disease, and it’s Potential for Infection Inhibition by Employing Natural Products National Taiwan University Hanne Inez Wolff Aug. 21st, 2013

Research Proposal Chagas Disease is affecting million people world wide, especially in rural areas of Latin America. There are two phases to the disease; the acute phase which lasts about 4-8 weeks, and the chronic phase which follows the acute phase. Currently, there are only two drugs to treat Chagas disease, which are both not approved by the FDA, and to get a hold of the drugs, infected individuals must request them through the CDC and follow strict protocols. More importantly, these two drugs, despite their serious side effects, have shown efficiency only in infected individuals with acute Chagas Disease. My research is looking at potential Natural Products to treat chronic Chagas Disease via utilizing computational modeling and predictions.

Methodology Screened and identified “good” PDB structures for docking. “Good” is defined as experimental and docking overlap Two docking programs were utilized: AutoDock 4.0 with plug in AutoDock Vina Three Trans-Sialidase structures were identified as good representations in the PDB: 1MS9, 1MS8, 1S0J Both 1MS9, and 1MS8 are from Buschiazzo (2002) article 1S0J is from Amaya (2004) article

Data Collected from PDB Analysis Experimental OverlapBinding Affinity kcal/molRMSD Å PDB IDPaperVinaAD4VinaAD4VinaAD4VinaAD4 1S0JAmaya (2004)YYY (conf. 1)Y AH2Amaya (2004)YYNY S0IAmaya (2004)YYY (conf. 1)N MR5Buschiazzo (2002)NN No Ligand MS8Buschiazzo (2002)YYY (conf. 1)Y MS5Buschiazzo (2002)YN No Ligand MS9Buschiazzo (2002)YYYY MS3Buschiazzo (2002)NN No Ligand MS4Buschiazzo (2002)NN No Ligand MS0Buschiazzo (2002)NN Two Ligands-----

Experimental Ligand crystal (Yellow) Vina Docking (Red) AutoDock4.0 Docking (Pink) 1S0J - Trypanosoma cruzi trans-sialidase in complex with MuNANA (Michaelis complex)

1MS8 - Triclinic form of Trypanosoma cruzi trans-sialidase, in complex with 3-deoxy-2,3-dehydro-N-acetylneuraminic acid (DANA) Experimental Ligand crystal (Yellow) Vina Docking (Red) AutoDock4.0 Docking (Pink)

1MS9 - Triclinic form of Trypanosoma cruzi trans- sialidase, in complex with lactose Experimental Ligand crystal (Yellow) Vina Docking (Red) AutoDock4.0 Docking (Pink)

Results – 1S0J The best structures were used for docking: Top Ranking binding energies, 1S0J: Rank File NameBinding Affinity kcal/mol TPD _out.pdbqt TPD _out.pdbqt TPD _out.pdbqt TPD _out.pdbqt TPD _out.pdbqt TPD _out.pdbqt TPD _out.pdbqt TPD _out.pdbqt TPD _out.pdbqt TPD _out.pdbqt -11.8

Results – 1MS8 The best structures were used for docking: Top Ranking binding energies, 1MS8: Rank File NameBinding Affinity kcal/mol TPD _out.pdbqt TPD _out.pdbqt TPD _out.pdbqt TPD _out.pdbqt TPD _out.pdbqt TPD _out.pdbqt TPD _out.pdbqt TPD _out.pdbqt TPD _out.pdbqt TPD _out.pdbqt -11.6

Results – 1MS9 The best structures were used for docking: Top Ranking binding energies, 1MS9: Rank File NameBinding Affinity kcal/mol TPD _out.pdbqt TPD _out.pdbqt TPD _out.pdbqt TPD _out.pdbqt TPD _out.pdbqt TPD _out.pdbqt TPD _out.pdbqt TPD _out.pdbqt TPD _out.pdbqt TPD _out.pdbqt -11.6

Top 3 Results Consistently these three compounds are ranked top three across the different trans-sialidase pdb files: dihalenaquinolide A (CSN: ) (+)-Ovigeridimerin (CSN: ) Bisisodiospyrin (CSN: )

Dihalenaquinolide A Catalogue number for Taiwanese Pharmaceutical Database, CSN: Vina docking result: kcal/mol AutoDock 4.0 docking result: kcal/mol Agreement between Vina and AutoDock 4.0 alignment

Vina (Yellow) AutoDock 4.0 (Red)

Vina (Yellow) AutoDock 4.0 (Red)

(+)-Ovigeridimerin Catalogue number for Taiwanese Pharmaceutical Database, CSN: Vina docking result: kcal/mol AutoDock 4.0 docking result: kcal/mol

Vina (Yellow) AutoDock 4.0 (Red)

Vina (Yellow) AutoDock 4.0 (Red)

Bisisodiospyrin Catalogue number for Taiwanese Pharmaceutical Database, CSN: Vina docking result: kcal/mol AutoDock 4.0 docking result: kcal/mol

Vina (Red) AutoDock 4.0 (Pink)

Vina (Red) AutoDock 4.0 (Pink)

I Would Like to Extend a Thanks to... University of California, San Diego Gabriele Wienhausen Peter Arzberger Dr. Phil Bourne Chirag Krishna National Taiwan University Dr. Jung-Hsin Lin Dr. Jung-Hsin Lin’s lab, and finally Tosh Nomura Eureka! Foundation for making this trip possible