Structure-activity relationship of truncated and substituted analogues of the intracellular delivery vector Penetratin

Peter M. Fischer, N. Z. Zhelev, S. Wang, J. E. Melville, R. Fåhraeus, D. P. Lane

Research output: Contribution to journalArticlepeer-review

145 Citations (Scopus)


Peptides derived from the third α-helix of the homeodomain (residues 43-58; Penetratin) of Antennapedia, a Drosophila homeoprotein, were prepared by simultaneous multiple synthesis. Sets of N- and C-terminally truncated peptides, as well as a series of alanine substitution analogues, were studied. Cell penetration assays using human cell cultures with these peptides revealed that the C-terminal segment 52Arg-Arg-Met-Lys-Trp-Lys- Lys58 of the parent sequence was necessary and sufficient for efficient cell membrane translocation. Individual Ala substitutions of the peptide's basic residues led to markedly decreased cell internalization ability, whereas replacement of hydrophobic residues was tolerated surprisingly well. Subcellular localization was seen to be affected by substitutions, with analogues being addressed preferentially to the cytosol or to the nucleus. Conformational constriction of the Penetratin sequence through placement and oxidation of flanking cysteine residues afforded a cyclic disulfide peptide which had lost most of its membrane translocation capacity.

Original languageEnglish
Pages (from-to)163-172
Number of pages10
JournalJournal of Peptide Research
Issue number2
Publication statusPublished - Feb 2000


  • Antennapedia homeoprotein
  • Cell internalization
  • Delivery vector
  • Membrane translocation
  • Penetratin

ASJC Scopus subject areas

  • Biochemistry
  • Endocrinology


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