Viral and cellular deoxyribonucleases are associated with herpes simplex virus replicative intermediates

Area of Science:

• Virology
• Molecular Biology
• Biochemistry

Background:

• Herpes simplex virus type 1 (HSV-1) replication involves complex interactions between viral and host cell machinery.
• Deoxyribonucleases (DNases) play critical roles in DNA metabolism, including viral DNA replication and processing.

Purpose of the Study:

• To investigate the presence and potential roles of viral and cellular deoxyribonucleases during HSV-1 infection.
• To identify specific DNases associated with viral nucleocapsids and replicative intermediates.

Main Methods:

• Partially purified HSV-1 replicative intermediates (nucleoprotein complexes) and nucleocapsids were prepared from infected BHK-21 cells.
• Western blotting was used to detect the viral-coded alkaline nuclease.
• Activity gel electrophoresis identified cellular deoxyribonucleases in infected and mock-infected cells.

Main Results:

• The 85 kDa viral alkaline nuclease was detected in infected cell extracts and later in viral DNA-containing nucleoprotein complexes.
• Two of three cellular deoxyribonucleases were found in infected cell extracts.
• A 50 kDa cellular deoxyribonuclease was detected in nucleocapsids and nucleoprotein complexes during infection.

Conclusions:

• The viral nuclease likely plays a role in the biosynthesis of late HSV-1 replicative intermediates.
• Cellular deoxyribonucleases, particularly the 50 kDa enzyme, may also be involved in viral replication.
• These findings suggest active involvement of the nuclear matrix in the viral replication cycle.