KPRa peptide

KPRa peptide

• Handling and Storage of Synthetic Peptides
• Material Safety Data Sheets (MSDS)

H-KMAPKKRK-OH

H-Lys-Met-Ala-Pro-Lys-Lys-Arg-Lys-OH

8

95.9%

C₄₃H₈₃N₁₅O₉S

986.28

Synthetic

Powder

KPRa is a synthetic monopartite peptide that showed nuclear import activity in NTS-polyplex vector-mediated gene delivery. KPRa could also improve the transfection of other nonviral vectors used in gene therapy. KPRa electrostatically bound to plasmid DNA increased the transgene expression compared with KPSV40 and enabled nuclear translocation of KPRa-fused red fluorescent proteins and plasmid DNA.

Normally, this peptide will be delivered in lyophilized form and should be stored in a freezer at or below -20 °C. For more details, please refer to the manual:Handling and Storage of Synthetic Peptides

• Lopez-Salas FE, Nadella R, Maldonado-Berny M, Escobedo-Sanchez ML, Fiorentino-Pérez R, Gatica-García B, Fernandez-Parrilla MA, Mario Gil M, Reyes-Corona D, García U, Orozco-Barrios CE, Gutierrez-Castillo ME, Martinez-Fong D. Synthetic Monopartite Peptide That Enables the Nuclear Import of Genes Delivered by the Neurotensin-Polyplex Vector. Mol Pharm. 2020 Dec 7;17(12):4572-4588. doi: 10.1021/acs.molpharmaceut.0c00755. Epub 2020 Oct 30. PMID: 33125243.

Trifluoroacetic acid (TFA) has a significant impact on peptides due to its role in the peptide synthesis process.

TFA is essential for the protonation of peptides that lack basic amino acids such as Arginine (Arg), Histidine (His), and Lysine (Lys), or ones that have blocked N-termini. As a result, peptides often contain TFA salts in the final product.

TFA residues, when present in custom peptides, can cause unpredictable fluctuations in experimental data. At a nanomolar (nM) level, TFA can influence cell experiments, hindering cell growth at low concentrations (as low as 10 nM) and promoting it at higher doses (0.5–7.0 mM). It can also serve as an allosteric regulator on the GlyR of glycine receptors, thereby increasing receptor activity at lower glycine concentrations.

In an in vivo setting, TFA can trifluoroacetylate amino groups in proteins and phospholipids, inducing potentially unwanted antibody responses. Moreover, TFA can impact structure studies as it affects spectrum absorption.