Yale scientists visualize details of how hepatitis C unwinds RNA

New Haven, Conn. -- Research led by Anna Marie Pyle, professor of molecular biophysics and biochemistry at Yale University reveals how a protein from Hepatitis C (HCV) unwinds RNA, potentially allowing it to be copied.

The work published in the journal Nature focuses on an enzyme, helicase NS3, that unwinds the RNA virus for replication inside cells. NS3 is one member of an extensive family of helicases and is used as a model for studying unwinding activities of motor proteins.

Their findings are particularly important because NS3 is a major drug target against HCV and understanding the helicase function will aid in the development of HCV inhibitors.

Pyle's results contradict the idea that helicases move smoothly with the continuous action of a snow plow. Instead, NS3 moves with a discontinuous stepping motion that alternates rapid translocation with pausing. "We observe that the helicase proceeds through discreet spatial and kinetic microstates," Pyle said. "We actually track the speed and processivity of the helicase as it passes through each base pair of its substrate."

"While this report is the first of its kind, and has produced highly significant results, it is only the beginning of a new understanding in HCV enzymology," said Pyle. "In the future, our approaches will be used to understand the composition of the HCV replication complex and the interplay between its constituent proteins. Comparative studies will be done on other viruses and in other systems where helicase function is critical."

These novel features were revealed using a new type of combinatorial enzymology that allows the behavior of helicase enzymes to be directly compared on a sequence panel. This is the first time that the behavior of a nucleic acid remodeling protein has been monitored at this high resolution, as it acts upon or passes each subunit of its target, according to Pyle. Since the work was conducted on RNA, it helps to b

Contact: Janet Rettig Emanuel
203- 432-2157
Yale University

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