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Effect of viral genome-linked protein (VPg) on protease function of nuclear inclusion- a (NIa) protein of pepper vein banding virus

Chhavi, Mathur and Anindya, Roy and Savithri, HS (2008) Effect of viral genome-linked protein (VPg) on protease function of nuclear inclusion- a (NIa) protein of pepper vein banding virus. In: Indian Journal Of Virology, 19 (1). pp. 105-106.

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Abstract

In the Indian subcontinent, a major bottleneck in cultivation of pepper has been the crop loss due to viral infection, particularly by pepper vein banding virus (PVBV). PVBV, like other members of Potyvirus group (Family: Potyviridae), forms flexous, non-enveloped, rod-shaped virus particles. Its 9.7 kb long genome is translated into ∼300 kDa polyprotein that is proteolytically processed to give ten individual proteins. This processing is largely carried out by the NIa (Nuclear Inclusion-a) protein. This protein has two domains: the N-terminal VPg (Viral genome-linked protein) and the C-terminal NIa protease. In this study, we aim to investigate the effect of VPg on the protease activity of NIa protease. The protease activity of the NIa protease was studied using an in vitro bead- attached GFP assay. Kinetic parameters of the enzyme were determined. The VPgNIa ORF was amplified using appropriate primers. The PCR product was cloned and over expressed in E. coli. Most of the VPgNIa was seen as cleaved products, VPg and NIa protease, on SDS-PAGE. The cleavage was abolished by mutation of the cleavage site glutamate, and the full length VPgNIa was obtained. The protease activity of VPgNIa was compared with that of NIa protease using the in vitro bead- attached GFP assay. Preliminary results suggest that the presence of VPg at the N-terminus renders the NIa protease more active.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Indian Virological Society.
Department/Centre: Division of Biological Sciences > Biochemistry
Date Deposited: 03 Jun 2009 04:33
Last Modified: 03 Jun 2009 04:33
URI: http://eprints.iisc.ernet.in/id/eprint/17837

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