A novel interaction between the human papillomavirus type 16 E2 and E1--E4 proteins leads to stabilization of E2.
The E4 (also called E1--E4) and E2 proteins of human papillomavirus type 16 are thought to be expressed within the same cells of a lesion, and their open reading frames overlap, suggesting that they may have a functional relationship. We have examined the effect of co-expression of these two proteins and found that each enhances the level of the other. We also identified the N-terminus of E2 as the first example of a viral protein that directly binds the HPV16 E1--E4 protein. This appears to result in the E2 becoming less soluble and promotes its relocation from the nucleus to the cytoplasm. In addition, the turnover of the E2 protein is decreased in the presence of E1--E4. All this raises the possibility that E1--E4 acts to influence E2 activity by varying the amount of available E2 in the cell.
Davy
Clare
C
Division of Virology, MRC National Institute for Medical Research, Mill Hill, London, NW7 1AA, UK. cdavy@nimr.mrc.ac.uk
McIntosh
Pauline
P
Jackson
Deborah J
DJ
Sorathia
Rina
R
Miell
Matthew
M
Wang
Qian
Q
Khan
Jameela
J
Soneji
Yasmina
Y
Doorbar
John
J
D000595:Amino Acid Sequence; D001483:Base Sequence; D002460:Cell Line; D017931:DNA Primers / Q000235:genetics; D004279:DNA, Viral / Q000235:genetics; D004268:DNA-Binding Proteins / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism*; D004926:Escherichia coli / Q000235:genetics; D052162:Human papillomavirus 16 / Q000235:genetics / Q000378:metabolism*; D006801:Humans; D008969:Molecular Sequence Data; D015514:Oncogene Proteins, Fusion / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism*; D009856:Oncogene Proteins, Viral / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism*; D054730:Protein Interaction Domains and Motifs; D055550:Protein Stability; D011993:Recombinant Fusion Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D014162:Transfection; D014764:Viral Proteins / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism*
D017931:DNA Primers; D004279:DNA, Viral; D004268:DNA-Binding Proteins; C054855:E2 protein, Human papillomavirus type 16; D015514:Oncogene Proteins, Fusion; D009856:Oncogene Proteins, Viral; D011993:Recombinant Fusion Proteins; D014764:Viral Proteins; C072777:oncogene protein E1--E4, Human papillomavirus type 16