Host cell sumoylation level influences papillomavirus E2 protein stability
| Autor: | Xue-Lin Bian, Van G. Wilson, Yu-Chieh Wu, Adeline F. Deyrieux, Phillip R. Heaton |
|---|---|
| Jazyk: | angličtina |
| Předmět: |
Gene Expression Regulation
Viral Proteasome Endopeptidase Complex HPV SUMO-1 Protein Cell SUMO protein Biology Article 03 medical and health sciences Viral Proteins Virology medicine Humans Papillomaviridae 030304 developmental biology 0303 health sciences Proteasome Protein Stability 030302 biochemistry & molecular biology Molecular biology In vitro medicine.anatomical_structure SUMO E2 protein Post-translational modification Keratinocyte differentiation Protein Processing Post-Translational Intracellular HeLa Cells |
| Zdroj: | Virology. (1):176-183 |
| ISSN: | 0042-6822 |
| DOI: | 10.1016/j.virol.2009.02.002 |
| Popis: | The stability of papillomavirus E2 proteins is regulated by proteasomal degradation, and regulation of degradation could contribute to the higher expression levels of E2 proteins observed in suprabasal layers of differentiated skin. We have recently shown that the E2 proteins are modified by sumoylation [Wu Y-C, Roark AA, Bian X-L, Wilson, VG (2008) Virol 378:329–338], and that sumoylation levels are up-regulated during keratinocyte differentiation [Deyrieux AF, Rosas-Acosta G, Ozbun MA, Wilson VG (2007) J Cell Sci 120:125–136]. These observations, coupled with the known ability of sumoylation to prevent proteasomal degradation of certain proteins, suggested that this modification might contribute to stabilizing E2 proteins in suprabasal keratinocytes. Conditions that increased overall sumoylation were found to increase the intracellular amounts of the HPV11, 16, and 18 E2 proteins. No effect of sumoylation was seen on E2 transcripts, and the increased levels of E2 proteins resulted from a greatly increased half-life for the E2 proteins. In vitro studies confirmed that sumoylation could block the proteasomal degradation of the 16E2 protein. Interestingly, this stabilization effect was indirect as it did not require sumoylation of 16E2 itself and must be acting through sumoylation of a cellular target(s). This sumoylation-dependent, indirect stabilization of E2 proteins is a novel process that may couple E2 levels to changes in the cellular environment. Specifically, our results suggest that the levels of papillomavirus E2 protein could be up-regulated in differentiating keratinocytes in response to the increased overall sumoylation that accompanies differentiation. |
| Databáze: | OpenAIRE |
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