Charaterization by two‐dimensional gel electrophoresis of host proteins whose synthesis is sustained or stimulated during the course of herpes simplex virus type 1 infection

Herpes simplex virus type 1 (HSV‐1) gene expression is concomitant with a selective shutoff of host protein synthesis. While the synthesis of the vast majority of cellular proteins is inhibited immediately after infection, several cellular proteins continue to be synthesized, even during the late phase of infection. Because these cellular proteins may intervene in the life cycle of the virus, we undertook two‐dimensional polyacrylamide gel electrophoresis (2‐D PAGE) analyses to evaluate the proportion of cellular proteins that is represented by these particular proteins. Human cells were infected with HSV‐1. At different times after infection, proteins were labeled with 35S just prior to harvesting. The rate of synthesis of a set of 183 acidic host proteins, as well as that of ribosomal proteins, was measured during the course of infection, after separation by 2‐D PAGE. As expected, HSV‐1 induces a strong inhibition of host protein synthesis immediately after infection. However, the synthesis of basic ribosomal proteins and that of an unexpected high proportion of the sub‐set of cellular proteins analyzed is sustained or stimulated during HSV‐1 infection. A 2‐D PAGE analysis outlining the expression patterns of these proteins at different times of infection is presented.