New breakthrough in anti-viral against Zika
NEW DELHI: Studies on virus and development of antiviral drugs used to be time-consuming and complex because the virus had to be grown in the laboratory for study. The advent and advancement of bioinformatics in the past decades have eased virology research now. Dr. Rajanish Giri at the Indian Institute of Technology, Mandi, has attempted to unravel the structure and action of the Zika Virus through computational research and biophysical studies. He is assisted in this work by Vladimir Uversky from University of South Florida and research scholar Pushpendra Mani Mishra. The team uses computer programs to understand the protein structure of the Zika virus, which would be valuable in designing therapeutic agents to treat viral infections. Their work has recently been published in the Journal of Molecular Biology.
“This research work is fundamental in nature and very important in terms of understanding, exploring and unraveling the complex mechanism of viral pathogenesis” says Dr. Giri.The Zika infection is a mosquito-borne illness, much like dengue and chikungunya, al-though viral transmissions through infected blood and sexual contact are also possible.
The Zika virus, like any virus, consists of a shell of protein, enclosing the nucleic acid —single-stranded RNA. The RNA codes for a polyprotein, which is a long chain of various proteins linked with one another. When there is a Zika infection, RNA genome of virus encode the polyprotein of the virus that matures into various protein by the combined action of host and viral protease enzymes. The generated viral components form the new viral particles in addition to disrupting some of the functions of the host, resulting in various symptoms. In the case of Zika, some of the viral proteins disrupt the generation of nerve cells in the host. Since nerve cells are extensively formed in the foetus, the infection affects the nervous system of the unborn, resulting in abnormalities such as miscarriage, stillbirth, and brain malformations called microcephaly.
Viral vaccines and anti-virals are chemicals that bind to the viral proteins so that they cannot destroy the normal functions in the host. In order to design an anti-viral for Zika, it is necessary to identify the MoRF sites in the viral proteins that are produced due to encoding and processing of viral polyprotein in the host’s body. Dr. Giri and his team at IIT Mandi, have performed computational studies to identify and analyse the MoRF in the Zika Virus Proteome. There are various computer programs used in the field of proteomics that can be used to analyse the protein structure of any organism, using a reference protein database. Dr. Giri’s team has used molecular recognition feature analysing computational tools to to identify the MoRF regions in proteins of Zika virus. They have used protein information from a Zika virus protein database called UniProt, as reference to confirm the protein sequence in a particular strain of Zika, called Mr 766. The disorderliness of the cofactor region (NS2B Region) of a particular enzyme protein (NS2B-NS3) has been confirmed using a technique called circular dichroism spectroscopy.