Phosphorylation Time-course Study of the Response During Adenovirus Type 2 Infection.

PTMs such as phosphorylations are usually involved in signal transduction pathways. To investigate the temporal dynamics of phosphoproteome changes upon viral infection, a model system of IMR-90 cells infected with human adenovirus type 2 (Ad2) was used in a time-course quantitative analysis combining titanium dioxide (TiO ) particle enrichment and SILAC-MS. Quantitative data from 1552 phosphorylated sites clustered the highly altered phosphorylated sites to the Signaling by Rho Family GTPases, the Actin Cytoskeleton Signaling and the cAMP-dependent protein kinase A signaling pathways. Their activation was especially pronounced at early time post-infection. Changes of several phosphorylated sites involved in the Glycolysis pathway, related to the activation of the Warburg effect, point at virus-induced energy production. For Ad2 proteins, 32 novel phosphorylation sites were identified and as many as 52 phosphorylated sites on 17 different Ad2 proteins were quantified, most of them at late time post-infection. Kinase predictions highlighted activation of PKA, CDK1/2, MAPK and CKII. Overlaps of kinase motif sequences for viral and human proteins were observed, stressing the importance of phosphorylation during Ad2 infection. This article is protected by copyright. All rights reserved.