Characterization of three human sec14p-like proteins: a-Tocopherol

Zingg, J.M., Kempna, P., Paris, M., Reiter, E., Villacorta, L., Cipollone, R., Munteanu, A., De Pascale, C., Menini, S., Cueff, A., Arock, M., Azzi, A. and Ricciarelli, R. 2008. Characterization of three human sec14p-like proteins: a-Tocopherol. Biochimie . 90 (11-12), p. 1703–1715. doi:10.1016/j.biochi.2008.07.008

TitleCharacterization of three human sec14p-like proteins: a-Tocopherol
AuthorsZingg, J.M., Kempna, P., Paris, M., Reiter, E., Villacorta, L., Cipollone, R., Munteanu, A., De Pascale, C., Menini, S., Cueff, A., Arock, M., Azzi, A. and Ricciarelli, R.
Abstract

Three closely related human sec14p-like proteins (hTAP1, 2, and 3, or SEC14L2, 3, and 4, respectively) have been described. These proteins may participate in intracellular lipid transport (phospholipids, squalene, tocopherol analogues and derivatives) or influence regulatory lipid-dependent events. Here, we show that the three recombinant hTAP proteins associate with the Golgi apparatus and mitochondria, and enhance the in vitro transport of radioactively labeled α-tocopherol to mitochondria in the same order of magnitude as the human α-tocopherol transfer protein (α-TTP). hTAP1 and hTAP2 are expressed in several cell lines, whereas the expression level of hTAP3 is low. Expression of hTAP1 is induced in human umbilical cord blood-derived mast cells upon differentiation by interleukin 4. In tissues, the three hTAPs are detectable ubiquitously at low level; pronounced and localized expression is found for hTAP2 and hTAP3 in the perinuclear region in cerebellum, lung, liver and adrenal gland. hTAP3 is well expressed in the epithelial duct cells of several glands, in ovary in endothelial cells of small arteries as well as in granulosa and thecal cells, and in testis in Leydig cells. Thus, the three hTAPs may mediate lipid uptake, secretion, presentation, and sub-cellular localization in a tissue-specific manner, possibly using organelle- and enzyme-specific docking sites.

JournalBiochimie
Journal citation90 (11-12), p. 1703–1715
ISSN0300-9084
Year2008
PublisherElsevier
Digital Object Identifier (DOI)doi:10.1016/j.biochi.2008.07.008
Publication dates
Published05 Aug 2008

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