Conserved Endonuclease Function of Hantavirus L Polymerase

Area of Science:

• Virology
• Molecular Biology
• Drug Discovery

Background:

• Hantaviruses are emerging pathogens within the Bunyaviridae family.
• Hantavirus RNA-dependent RNA polymerase (L protein) lacks intrinsic capping activity.
• Hantaviruses utilize a
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• Meta_Description='Identify novel hantavirus endonuclease inhibitors using a new cell-based assay for drug screening.'
• endonuclease activity for cap acquisition via "cap snatching" from host transcripts.
• This activity resides in the L protein's N-terminal domain.

Purpose of the Study:

• To confirm and extend findings on hantavirus L protein endonuclease activity.
• To characterize the endonuclease's catalytic properties and conservation.
• To develop a high-throughput assay for identifying hantavirus endonuclease inhibitors.

Main Methods:

• Molecular modeling and structure-function analysis.
• Recombinant protein expression and activity assays.
• Development and validation of a cell-based endonuclease assay.

Main Results:

• High conservation of L endonuclease activity between Old and New World hantaviruses confirmed.
• Recombinant L endonuclease exhibits catalytic activity with specific cation preferences.
• A robust, high-throughput compatible cell-based assay for hantavirus endonuclease was established.

Conclusions:

• The L protein's N-terminal domain is crucial for hantavirus cap snatching.
• The developed assay facilitates drug screening for novel antiviral compounds.
• Inhibitors targeting the endonuclease may offer broad activity against Bunyaviridae infections.