Journal
JOURNAL OF VIROLOGY
Volume 76, Issue 24, Pages 13039-13048Publisher
AMER SOC MICROBIOLOGY
DOI: 10.1128/JVI.76.24.13039-13048.2002
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Funding
- NCI NIH HHS [CA 09135, CA 22443, CA 07175, P01 CA022443, T32 CA009135] Funding Source: Medline
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Human papillomaviruses (HPVs) are small DNA tumor viruses that are the causative agent of warts and are associated with many anogenital cancers. The viral gene encoding the E6 protein has been found to be involved in HPV oncogenesis. E6 is known to inactivate the cellular tumor suppressor, p53. In addition, E6 has been shown to bind to a variety of other cellular proteins. The focus of this study was to determine what role the interactions of E6 with a subset of cellular proteins which contain a common a-helical domain in their E6 binding region (a-helix partners) play in E6-mediated phenotypes. We generated transgenic mice expressing a mutant of E6, E6(1128T), which is defective for binding at least a subset of the a-helix partners, including E6AP, the ubiquitin ligase that mediates E6-dependent degradation of the p53 protein, to determine whether binding of a-helix partners plays a role in E6-mediated activities in vivo. Unlike mice expressing the wild-type E6 (strain K14E6(WT)), the mice expressing E6(1128T) lacked the ability to alter the radiation-induced block to DNA synthesis and promote the formation of benign skin tumors in conjunction with chemical carcinogens. Additionally, they displayed reduced levels of skin hyperplasia, spontaneous skin tumors, and tumor progression activity compared to those of the K14E6(WT) mice. From these results, we conclude that a domain in E6 that mediates a-helix partner binding is critical for E6-induced phenotypes in transgenic mice.
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