Enzyme studies (phosphorylation) during Newcastle disease virus infection of chick embryo cells

The infection of chicken embryo cells with Newcastle disease virus (NDV) caused the increased incorporation of 3H-uridine into viral ribonucleic acid (RNA). However, when uridine kinase activity was assayed, it was found that infected cells demonstrated the identical activity as uninfected chicken embryo cells. Hexokinase and adenosine triphosphatase showed the same trend as uridine kinase. However, carbamyl phosphate synthetase was found to increase in activity during NDV infection.