This subproject is one of many research subprojects utilizing the resources provided by a Center grant funded by NIH/NCRR. The subproject and investigator (PI) may have received primary funding from another NIH source, and thus could be represented in other CRISP entries. The institution listed is for the Center, which is not necessarily the institution for the investigator. NS5A is a protein encoded by the hepatitis C virus that is observed in two forms that differ by their phosphorylation state. The kinase is unknown but is believed to be cellular. It has been postulated that NS5A is an inhibitor of the host kinase PKR, which is a major regulator of the host antiviral defense pathway. We are attempting to determine the sites of phosphorylation of NS5A using NS5A isolated from several different expression systems.
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