BR2 (buforin IIb derivative) peptide (TFA removed)

BR2 (buforin IIb derivative) peptide (TFA removed)

• COA/MS/HPLC Report
• Handling and Storage of Synthetic Peptides
• Material Safety Data Sheets (MSDS)

Batch to batch variation of the purity

1 Vial

H-RAGLQFPVGRLLRRLLR-OH

H-Arg-Ala-Gly-Leu-Gln-Phe-Pro-Val-Gly-Arg-Leu-Leu-Arg-Arg-Leu-Leu-Arg-OH

17

95.94%

C₉₁H₁₆₁N₃₃O₁₉

2021.45

Synthetic

BR2 is one of the cell-penetrating peptides (CCPs), a Buforin IIb derivative. BR2 was found to have cancer-specificity without toxicity to normal cells. After specifically targeting cancer cells through interaction with gangliosides, BR2 entered cells via lipid-mediated macropinocytosis. Moreover, BR2 showed higher membrane translocation efficiency than the well-known CPP Tat (49–57). The capability of BR2 as a cancer-specific drug carrier was demonstrated by fusion of BR2 to a single-chain variable fragment (scFv) directed toward a mutated K-ras (G12V). BR2-fused scFv induced a higher degree of apoptosis than Tat-fused scFv in K-ras mutated HCT116 cells. These results suggest that the novel cell-penetrating peptide BR2 has great potential as a useful drug delivery carrier with cancer cell specificity.

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

• Yu T, Shi Y, Pan X, Feng Q, Wang P, Song S, Yang L, Yang J. BR2 cell penetrating peptide effectively delivers anti-p21Ras scFv to tumor cells with ganglioside expression for therapy of ras-driven tumor. PLoS One. 2022 Jun 1;17(6):e0269084.

Trifluoroacetic acid (TFA) is a strong acid, which is commonly used to cleave synthesized peptides from solid-phase resins and is also used to improve HPLC performance in the peptide purification step. By default, custom peptides are delivered as lyophilized TFA salts, and can contain as much as 10-45% TFA.

TFA in custom peptides can cause inexplicable discrepancies in subsequent assay data. For instance, TFA in nM concentrations has been shown to interfere with cellular assays, inhibiting cellular proliferation in some instances, and increasing cell viability in others . It has also been found to be an unintended allosteric modulator of the glycine receptor, GlyR.

TFA Removal Service is recommended for:

• Peptides that will be used in cellular assays
• Peptides that will be used as APIs or in manufactured products
• For hydrophilic peptides containing numerous basic residues