Proteomic Identification of Nuclear Processes Manipulated by Cytomegalovirus Early during Infection

ABSTRACT: Human cytomegalovirus (HCMV) is a herpesvirus that is ubiquitously distributed world-wide and causes life-threating disease upon immunosuppression. HCMV expresses numerous proteins that function to establish an intracellular environment that supports viral replication. Like most DNA viruses, HCMV manipulates processes within the nucleus. We have quantified changes in the host cell nuclear proteome at 24 hpi following infection with a clinical viral isolate. We have combined SILAC with multiple stages of fractionation to define changes. Tryptic peptides were analyzed by RP-HPLC combined with LC-MS/MS on an LTQ Orbitrap Velos massspectrometer. Data from three biological replicates were processed with MaxQuant. A total of 1281 cellular proteins were quantified and 77 were found to be significantly differentially expressed. In addition, we observed 36 viral proteins associated with the nucleus. Diverse biological processes were significantly altered including increased aspects of cell cycling, mRNA metabolism, and nucleocytoplasmic transport while decreased immune responses. We validated changes for several proteins including a subset of classical nuclear transport proteins. In addition, we demonstrated that disruption of these import factors is inhibitory to HCMV replication. Overall, we have identified HCMV-induced changes in the nuclear proteome and uncovered several processes that are important for infection.

INSTRUMENT(S): LTQ Orbitrap Velos

ORGANISM(S): Homo Sapiens (human) Human Cytomegalovirus (hhv-5) (human Herpesvirus 5)

TISSUE(S): Cell Culture, Fibroblast

DISEASE(S): Disease Free

SUBMITTER: Dominique Carter  

LAB HEAD: Scott Terhune

PROVIDER: PXD001909 | Pride | 2015-06-23

REPOSITORIES: Pride