Buforin II peptide

Buforin II peptide

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

Batch to batch variation of the purity

TRSSRAGLQFPVGRVHRLLRK

H-Thr-Arg-Ser-Ser-Arg-Ala-Gly-Leu-Gln-Phe-Pro-Val-Gly-Arg-Val-His-Arg-Leu-Leu-Arg-Lys-OH

21

97.1%

C₁₀₆H₁₈₄N₄₀O₂₆

2434.8

172998-24-2

Synthetic

Powder

Derived from buforin I after treatment with endoproteinase Lys-C. It displayed a more potent antimicrobial activity than its parent molecule. In TFE, buforin II contains a helix-hinge-helix structure with the first 4 aa disordered. A proline connects helix 1 (residues 5-10) and helix 2 (residues 12-21). MOA: It kills bacteria without lysing the cell. Instead, this peptide translocates aross bacterial membranes effectively. This is a typical peptide example that does not target bacterial membranes but internal targets such as nucleic acids. It has a strong affinity for DNA and RNA in vitro (Park et al 1998. Biochem Biophys Res Commun 244: 253-7). Both buforin II and its derivative buforin IIb (sequence: RAGLQFPVGRLLRRLLRRLLR) showed selective anticancer activity against 62 cancer cell lines (Lee 2008 Cancer Lett 271: 47-51). The sequence of histonin is RAGLQFPVGKLLKKLLKRLKR (updated 12/2008; Jan2013). Buforin II has Antibacterial, Antifungal activity. The source of Buforin II is Bufo bufo gargarizans, Asia.

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

• Carvajal SK, Vargas-Casanova Y, Pineda-Castañeda HM, García-Castañeda JE, Rivera-Monroy ZJ, Parra-Giraldo CM. In Vitro Antifungal Activity of Chimeric Peptides Derived from Bovine Lactoferricin and Buforin II against Cryptococcus neoformans var. grubii. Antibiotics (Basel). 2022 Dec 15;11(12):1819.

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.