mRNA-binding protein involved in translation elongation. Has an important function at the level of mRNA turnover, probably acting downstream of decapping. Involved in actin dynamics and cell cycle progression, mRNA decay and probably in a pathway involved in stress response and maintenance of cell wall integrity. With syntenin SDCBP, functions as a regulator of p53/TP53 and p53/TP53-dependent apoptosis. Regulates also TNF-alpha-mediated apoptosis. Mediates effects of polyamines on neuronal process extension and survival. May play an important role in brain development and function, and in skeletal muscle stem cell differentiation. Also described as a cellular cofactor of human T-cell leukemia virus type I (HTLV-1) Rex protein and of human immunodeficiency virus type 1 (HIV-1) Rev protein, essential for mRNA export of retroviral transcripts.
Specificity
Natural and recombinant Human Eukaryotic translation initiation factor 5A-1
Subcellular Location
Cytoplasm Nucleus Endoplasmic reticulum membrane Peripheral membrane protein Cytoplasmic side Nucleus nuclear pore complex Hypusine modification promotes the nuclear export and cytoplasmic localization and there was a dynamic shift in the localization from predominantly cytoplasmic to primarily nuclear under apoptotic inducing conditions.
Interacts with DHPS, with SDCBP and DOHH. Interacts with HIV-1 protein Rev. Found in a complex with Ran and XPO4. The hypusine modification increases the interaction with XPO4.