Abstract
The phosphoprotein 65 (pp65) of human cytomegalovirus is a prominent target of the antiviral CD8 T lymphocyte response. This study focused on investigating the properties of pp65 that render it a privileged antigen. It was found that pp65 was metabolically stable. The tegument protein was introduced into MHC class I presentation following its delivery via non-replicating dense bodies. No ubiquitination was found on particle-associated pp65. Proof was obtained that pp65 was a nucleocytoplasmic shuttle protein, using heterokaryon analyses. Based on this finding, inhibition experiments showed that presentation of particle-derived pp65 by HLA-A2 was sensitive to the impairment of the CRM1-mediated nuclear export pathway. The data support the idea that particle-derived pp65 can serve as a nuclear reservoir for proteasomal processing and MHC class I presentation, following its CRM1-dependent nuclear export. The presentation of pp65-derived peptides was also impaired by CRM1-inhibition following de novo synthesis of the tegument protein. However, pp65 protein levels were also reduced when blocking CRM1-mediated export after transient expression. This indicated that pp65 expression rather than direct interference with its own nuclear export was responsible for its reduced presentation in this case. The functionality of CRM1-mediated nuclear export is thus important for the presentation of pp65-derived peptides in the context of MHC class I on organ cells, both after exogenous uptake and after de novo synthesis of the tegument protein, but different mechanisms may account for either case.
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Acknowledgments
The technical assistance of Manuela Starke is gratefully acknowledged. We thank Katrin Besold for a critical review of the manuscript. We are indebted to Ute Moll (New York, NY) for the HTLV-1 plasmid pFlagNLSRex, to Eva Borst, Martin Messerle (Hannover, Germany) and Gabi Hahn (Ingolstadt, Germany) for BAC-clones and to William Britt (Birmingham, AL) for monoclonal antibodies. Dr. Jochen Beninga was involved in the initial experiments of this work. This work was supported by the Deutsche Forschungsgemeinschaft, SFB 490, individual project E7 (B.P.).
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Frankenberg, N., Lischka, P., Pepperl-Klindworth, S. et al. Nucleocytoplasmic shuttling and CRM1-dependent MHC class I peptide presentation of human cytomegalovirus pp65. Med Microbiol Immunol 201, 567–579 (2012). https://doi.org/10.1007/s00430-012-0269-7
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DOI: https://doi.org/10.1007/s00430-012-0269-7