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- W2339632020 abstract "The ability of a short, charged peptide to penetrate synthetic DOPC (1,2-dioleoyl-sn-3-glycerophosphocholine) liposomes was investigated by fluorescence confocal microscopy. The peptide, termed Tat (trans-activating transcription factor), was a 14-mer derived from the region of the HIV-1 Tat protein responsible for cellular internalization. This Tat peptide was labelled at a C-terminal cysteine residue with the fluorescent probes IAF (5-iodoacetamidofluorescein) or A568 (Alexa Fluor 568). The Tat-IAF conjugate was directly observed entering liposomes at room temperature (approx. 258C) in the absence of pH gradient, ATP or other energy source. The uptake of the Tat-A568 conjugate in unfixed, live HeLa cells was found to be via endocytosis, as expected. In contrast, when the peptide was attached to an IAF-labelled 25 kDa protein corresponding to the catalytic domain of Clostridium botulinum C3 exotoxin, this larger, Tat-C3-IAF construct was not able to enter liposomes, although it localized similarly to Tat-A568 in live cells. The data suggest that Tat peptide can cross synthetic bilayers spontaneously in vitro, but that size and type of cargo may limit this behaviour." @default.
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- W2339632020 date "2005-01-01" @default.
- W2339632020 modified "2023-09-27" @default.
- W2339632020 title "Translocation of the cell-penetrating Tat peptide across artificial bilayers and into living cells." @default.
- W2339632020 doi "https://doi.org/10.1042/bss0720199" @default.
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