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Human cytomegalovirus UL29/28 protein interacts with components of the NuRD complex which promote accumulation of immediate-early RNA.

PLoS pathogens | Jun 24, 2010

Histone deacetylation plays a pivotal role in regulating human cytomegalovirus gene expression. In this report, we have identified candidate HDAC1-interacting proteins in the context of infection by using a method for rapid immunoisolation of an epitope-tagged protein coupled with mass spectrometry. Putative interactors included multiple human cytomegalovirus-coded proteins. In particular, the interaction of pUL38 and pUL29/28 with HDAC1 was confirmed by reciprocal immunoprecipitations. HDAC1 is present in numerous protein complexes, including the HDAC1-containing nucleosome remodeling and deacetylase protein complex, NuRD. pUL38 and pUL29/28 associated with the MTA2 component of NuRD, and shRNA-mediated knockdown of the RBBP4 and CHD4 constituents of NuRD inhibited HCMV immediate-early RNA and viral DNA accumulation; together this argues that multiple components of the NuRD complex are needed for efficient HCMV replication. Consistent with a positive acting role for the NuRD elements during viral replication, the growth of pUL29/28- or pUL38-deficient viruses could not be rescued by treating infected cells with the deacetylase inhibitor, trichostatin A. Transient expression of pUL29/28 enhanced activity of the HCMV major immediate-early promoter in a reporter assay, regardless of pUL38 expression. Importantly, induction of the major immediate-early reporter activity by pUL29/28 required functional NuRD components, consistent with the inhibition of immediate-early RNA accumulation within infected cells after knockdown of RBBP4 and CHD4. We propose that pUL29/28 modifies the NuRD complex to stimulate the accumulation of immediate-early RNAs.

Pubmed ID: 20585571 RIS Download

Mesh terms: Autoantigens | Blotting, Western | Cells, Cultured | Chromatin Immunoprecipitation | Cytomegalovirus | Cytomegalovirus Infections | Fibroblasts | Fluorescent Antibody Technique | Histone Deacetylase 1 | Histone Deacetylase Inhibitors | Histone Deacetylases | Humans | Hydroxamic Acids | Immediate-Early Proteins | Immunoprecipitation | Luciferases | Mi-2 Nucleosome Remodeling and Deacetylase Complex | Promoter Regions, Genetic | RNA, Messenger | RNA, Viral | Repressor Proteins | Retinoblastoma-Binding Protein 4 | Reverse Transcriptase Polymerase Chain Reaction | Viral Proteins | Virus Replication

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Associated grants

  • Agency: NIDA NIH HHS, Id: DP1 DA026192
  • Agency: NCRR NIH HHS, Id: RR22220
  • Agency: NIDA NIH HHS, Id: DP1DA026192
  • Agency: NCI NIH HHS, Id: R01 CA082396
  • Agency: NIGMS NIH HHS, Id: GM62427
  • Agency: NCI NIH HHS, Id: CA85786
  • Agency: NCI NIH HHS, Id: R33 CA089810
  • Agency: NCRR NIH HHS, Id: P41 RR000862
  • Agency: NCRR NIH HHS, Id: U54 RR022220
  • Agency: NCI NIH HHS, Id: R01 CA085786
  • Agency: NCI NIH HHS, Id: CA89810
  • Agency: NIDA NIH HHS, Id: DP1 DA026192-04
  • Agency: NCRR NIH HHS, Id: RR00862
  • Agency: NIGMS NIH HHS, Id: R01 GM062427

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