Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

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Shi, X.P. et al.

The subcellular distribution of eukaryotic translation initiation factor, eIF-5A, in cultured cells.

To gain insight into the role of the eukaryotic translation initiation factor, eIF-5A, we investigated the subcellular distribution of this protein in several cultured cell types and at different stages of the cell cycle using a highly potent monospecific polyclonal antibody to eIF-5A. Studies using indirect immunofluorescence and confocal microscopy in conjunction with subcellular fractionation demonstrate that eIF-5A is primarily localized in the cytoplasm of cells. This cytoplasmic location of eIF-5A is not significantly altered in different stages of the cell cycle and the subcellular distribution pattern of eIF-5A is not changed by viral oncogene transformation. Cell fractionation experiments identified two populations of eIF-5A in the cytoplasm, a soluble fraction and a fraction bound to internal membranes. By double immunofluorescence staining with an antibody against calnexin, a resident protein of the endoplasmic reticulum (ER), we demonstrate that the membrane-bound fraction of eIF-5A colocalizes with the ER and not with the cytoskeleton. Expression of Rev, a regulatory protein of human immunodeficiency virus type 1 (HIV-1), does not alter the subcellular distribution of endogenous eIF-5A in these cells. eIF-5A is detected in all tissues and cells examined including extracts prepared from Xenopus oocytes. Our results indicate that eIF-5A is a ubiquitous cytoplasmic protein and suggest that a site of eIF-5A function is likely to be in association with the ER.[1]

References

The subcellular distribution of eukaryotic translation initiation factor, eIF-5A, in cultured cells. Shi, X.P., Yin, K.C., Zimolo, Z.A., Stern, A.M., Waxman, L. Exp. Cell Res. (1996) [Pubmed]

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