Determining the Molecular Origins of Allostery for the RNA polymerase from the Hepatitis C Virus Abstract Hepatitis C virus (HCV) infects 170 million people worldwide, and approximately 3-4 million people within the United States. To date, there is no cure for this disease, and 25% of individuals living with HCV contract chronic liver ailments such as cirrhosis or liver cancer. The HCV RNA polymerase (gene product NS5B) has become a drug target because of its importance in viral replication. Several small molecules have been identified that inhibit NS5B and bind outside of the active site;these are referred to as allosterc inhibitors. There are five different allosteric binding sites that have been identified, and severa crystal structures of NS5B enzyme bound to various inhibitors exist. However, a mechanism of inhibition is unclear from the structural data alone and has yet to be conclusively determined. We hypothesize that one can understand the effect of allosteric inhibitors on the functional properties of NS5B by using molecular dynamics simulations to study the enzyme in a free state and bound to various inhibitors. Molecular dynamics is an optimal tool to study this problem because it can provide information about both structure and dynamics at a level of fine detail. By understanding the structural, dynamic, and thermodynamic changes that accompany ligand binding, we hope to determine the molecular origins of allosteric inhibition in NS5B. In the process we will gain essential information on how NS5B and other viral polymerases replicate RNA. Besides illuminating fundamental questions regarding the link between enzyme function and dynamics, this information may aid in the development of novel and more effective inhibitors for NS5B, and ultimately better treatments for HCV.

Public Health Relevance

The proposed research will provide a better understanding of allosteric inhibition in the RNA polymerase from Hepatitis C virus. In the short term, this project will reveal a mechanism of inhibition for the polymerase and suggest novel modes of inhibition. In the long term, the knowledge from this project can be used to identify better ways to inhibit this enzyme and thus improved treatments for patients suffering from Hepatitis C virus infection.

Agency
National Institute of Health (NIH)
Type
Predoctoral Individual National Research Service Award (F31)
Project #
5F31GM106959-02
Application #
8724231
Study Section
Special Emphasis Panel (ZRG1)
Program Officer
Gaillard, Shawn R
Project Start
Project End
Budget Start
Budget End
Support Year
2
Fiscal Year
2014
Total Cost
Indirect Cost
Name
University of Maryland Balt CO Campus
Department
Chemistry
Type
Schools of Arts and Sciences
DUNS #
City
Baltimore
State
MD
Country
United States
Zip Code
21250