Pep-1 (uncapped)


PEP-1 peptide, which has 21 amino acid residues, is a known carrier peptide that delivers full-length native proteins in vitro and in vivo. Pep-1 peptide, consists of three domains: (1) a hydrophobic tryptophan-rich motif containing five tryptophan residues (KETW WETWWTEW); (2) a hydrophilic lysine-rich domain (KKKRKV) derived from the nuclear localization sequence (NLS) of simian virus 40 (SV-40) large T antigen; and (3) a spacer domain (SQP), separating the two domains mentioned above, containing a proline residue, which improves the flexibility and the integrity of both the hydrophobic and the hydrophilic domains. In standard cell culture conditions, Pep-1 localizes rapidly, in <10 min, to the nucleus of human HS-68, murine NIH-3T3 fibroblasts, or Cos cells. Similar experiments, performed by incubating cells for 30 min at 4°C before transfection, yielded essentially the same result, indicating that Pep-1 internalization is independent of normal endocytosis.

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% Peak Area By HPLC ≥ 95%


TFA Salt



Store at -20°C. Store under desiccating conditions. The product can be stored for up to 12 months.



This product as supplied is intended for research use only, not for use in human, therapeutic or diagnostic applications without the expressed written authorization of United States Biological.





1 mg, 5 mg, Other