Synthetic lethal mutations in the cyclin A interface of human cytomegalovirus.
| Autor: | Henry Weisbach, Christoph Schablowsky, Barbara Vetter, Iris Gruska, Christian Hagemeier, Lüder Wiebusch |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: | |
| Zdroj: | PLoS Pathogens, Vol 13, Iss 1, p e1006193 (2017) |
| Druh dokumentu: | article |
| ISSN: | 1553-7366 1553-7374 |
| DOI: | 10.1371/journal.ppat.1006193 |
| Popis: | Generally, the antagonism between host restriction factors and viral countermeasures decides on cellular permissiveness or resistance to virus infection. Human cytomegalovirus (HCMV) has evolved an additional level of self-imposed restriction by the viral tegument protein pp150. Depending on a cyclin A-binding motif, pp150 prevents the onset of viral gene expression in the S/G2 cell cycle phase of otherwise fully permissive cells. Here we address the physiological relevance of this restriction during productive HCMV infection by employing a cyclin A-binding deficient pp150 mutant virus. One consequence of unrestricted viral gene expression in S/G2 was the induction of a G2/M arrest. G2-arrested but not mitotic cells supported viral replication. Cyclin A destabilization by the viral gene product pUL21a was required to maintain the virus-permissive G2-arrest. An HCMV double-point mutant where both pp150 and pUL21a are disabled in cyclin A interaction forced mitotic entry of the majority of infected cells, with a severe negative impact on cell viability and virus growth. Thus, pp150 and pUL21a functionally cooperate, together building a cell cycle synchronization strategy of cyclin A targeting and avoidance that is essential for productive HCMV infection. |
| Databáze: | Directory of Open Access Journals |
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