Specificity of baculovirus p10 functions

Area of Science:

• Virology
• Molecular Biology
• Insect Pathology

Background:

• Baculovirus p10 proteins possess functional domains for aggregation, nuclear disintegration, and fibril formation.
• Understanding the specificity of these p10 functions is crucial for baculovirus research.

Purpose of the Study:

• To investigate the functional specificity of the Spodoptera exigua (Se) MNPV p10 protein within an Autographa californica (AcMNPV) context.
• To determine if SeMNPV p10 can form fibrillar structures and induce nuclear disintegration in AcMNPV-infected cells.

Main Methods:

• Construction of a recombinant AcMNPV (AcCR1) replacing the native p10 gene with the SeMNPV p10 sequence.
• Analysis of SeMNPV p10 protein expression levels and fibrillar structure formation in AcCR1-infected cells.
• Mixed infection experiments with wild-type AcMNPV and AcCR1 to study p10 aggregation specificity.
• Assessment of polyhedra release in Spodoptera exigua cells infected with AcCR1, AcMNPV, or SeMNPV.

Main Results:

• SeMNPV p10 protein was expressed at high levels in AcCR1-infected cells, similar to wild-type AcMNPV p10.
• SeMNPV p10 successfully formed fibrillar structures in AcCR1-infected cells, indicating conserved function in a heterologous baculovirus context.
• Mixed infections revealed species-specific aggregation of p10 proteins.
• AcCR1 infection of S. exigua cells failed to induce polyhedra release, unlike AcMNPV or SeMNPV infections.

Conclusions:

• The SeMNPV p10 protein retains the ability to form fibrillar structures when expressed in an AcMNPV background.
• P10 protein aggregation is species-specific.
• Nuclear disintegration and polyhedra release mediated by p10 require interaction with virus-specific factors distinct from the p10 protein itself.