Adenovirus E4orf6 targets pp32/LANP to control the fate of ARE-containing mRNAs by perturbing the CRM1-dependent mechanism.
E4orf6 plays an important role in the transportation of cellular and viral mRNAs and is known as an oncogene product of adenovirus. Here, we show that E4orf6 interacts with pp32/leucine-rich acidic nuclear protein (LANP). E4orf6 exports pp32/LANP from the nucleus to the cytoplasm with its binding partner, HuR, which binds to an AU-rich element (ARE) present within many protooncogene and cytokine mRNAs. We found that ARE-mRNAs, such as c-fos, c-myc, and cyclooxygenase-2, were also exported to and stabilized in the cytoplasm of E4orf6-expressing cells. The oncodomain of E4orf6 was necessary for both binding to pp32/LANP and effect for ARE-mRNA. C-fos mRNA was exported together with E4orf6, E1B-55kD, pp32/LANP, and HuR proteins. Moreover, inhibition of the CRM1-dependent export pathway failed to block the export of ARE-mRNAs mediated by E4orf6. Thus, E4orf6 interacts with pp32/LANP to modulate the fate of ARE-mRNAs by altering the CRM1-dependent export pathway.
Higashino
Fumihiro
F
Department of Oral Pathobiological Science, Hokkaido University Graduate School of Dental Medicine, Sapporo 060-8586, Japan. fhigashi@den.hokudai.ac.jp
Aoyagi
Mariko
M
Takahashi
Akiko
A
Ishino
Masaho
M
Taoka
Masato
M
Isobe
Toshiaki
T
Kobayashi
Masanobu
M
Totsuka
Yasunori
Y
Kohgo
Takao
T
Shindoh
Masanobu
M
D021581:Active Transport, Cell Nucleus / Q000502:physiology; D000256:Adenoviridae / Q000235:genetics / Q000378:metabolism*; D017501:Adenovirus E1B Proteins / Q000235:genetics / Q000378:metabolism; D017504:Adenovirus E4 Proteins / Q000235:genetics / Q000378:metabolism*; D000954:Antigens, Surface / Q000235:genetics / Q000378:metabolism; D002460:Cell Line; D002467:Cell Nucleus / Q000378:metabolism; D051959:ELAV Proteins; D000067780:ELAV-Like Protein 1; D006801:Humans; D028884:Karyopherins / Q000235:genetics / Q000378:metabolism*; D009479:Neuropeptides / Q000235:genetics / Q000378:metabolism*; D009687:Nuclear Proteins / Q000235:genetics / Q000378:metabolism*; D016366:Open Reading Frames / Q000235:genetics; D011485:Protein Binding / Q000502:physiology; D017434:Protein Structure, Tertiary / Q000502:physiology; D021381:Protein Transport / Q000502:physiology; D016760:Proto-Oncogene Proteins c-fos / Q000235:genetics / Q000378:metabolism; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism*; D012367:RNA, Viral / Q000235:genetics / Q000378:metabolism*; D016601:RNA-Binding Proteins / Q000235:genetics / Q000378:metabolism; D018160:Receptors, Cytoplasmic and Nuclear / Q000235:genetics / Q000378:metabolism*; D000097606:Exportin 1 Protein
D017501:Adenovirus E1B Proteins; D017504:Adenovirus E4 Proteins; D000954:Antigens, Surface; D051959:ELAV Proteins; D000067780:ELAV-Like Protein 1; D028884:Karyopherins; D009479:Neuropeptides; D009687:Nuclear Proteins; D016760:Proto-Oncogene Proteins c-fos; D012333:RNA, Messenger; D012367:RNA, Viral; D016601:RNA-Binding Proteins; D018160:Receptors, Cytoplasmic and Nuclear; D000097606:Exportin 1 Protein; C490338:Anp32a protein, rat; C098770:ELAVL1 protein, human