Q53 CecB (Cecropin B) peptide

Q53 CecB (Cecropin B) peptide

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

Batch to batch variation of the purity

H-AGWLRKLGKKIQRIGQHTRDASIQVLGIAQQAANVAATAR-NH2

H-Ala-Gly-Trp-Leu-Arg-Lys-Leu-Gly-Lys-Lys-Ile-Gln-Arg-Ile-Gly-Gln-His-Thr-Arg-Asp-Ala-Ser-Ile-Gln-Val-Leu-Gly-Ile-Ala-Gln-Gln-Ala-Ala-Asn-Val-Ala-Ala-Thr-Ala-Arg-NH2

40

95.2%

C₁₈₇H₃₂₁N₆₅O₅₁

4295.93

Synthetic

Powder

These cecropin B isoforms differ in a single amino acid substitution within the active portion of the peptide, so that the glutamic acid of the E53 CecB variant is replaced by a glutamine in the Q53 CecB isoform. Both peptides showed a high antimicrobial and membranolytic activity against P. aeruginosa, with Q53 CecB displaying greater activity compared with the E53 CecB isoform. Biophysical analyses, live-cell NMR, and moleculardynamic-simulation studies indicated that both peptides might act as membrane-interacting elements, which can disrupt outermembrane organization, facilitating their translocation toward the inner membrane of the bacterial cell. Our data also suggest that the amino acid variation of the Q53 CecB isoform represents a critical factor in stabilizing the hydrophobic segment that interacts with the bacterial membrane, determining the highest antimicrobial activity of the whole peptide. Its high stability to pH and temperature variations, tolerance to high salt concentrations, and low toxicity against human cells make Q53 CecB a promising candidate in the development of CecB-derived compounds against P. aeruginosa.

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

• Romoli O, Mukherjee S, Mohid SA, et al. Enhanced Silkworm Cecropin B Antimicrobial Activity against Pseudomonas aeruginosa from Single Amino Acid Variation. ACS Infect Dis. 2019;5(7):1200-1213. doi:10.1021/acsinfecdis.9b00042

Trifluoroacetic acid (TFA) is a common counterion from the purification process using High-Performance Liquid Chromatography (HPLC). The presence of TFA can affect the peptide's net weight, appearance, and solubility.

Impact on Net Weight: The TFA salt contributes to the total mass of the product. In most cases, the peptide content constitutes >80% of the total weight, with TFA accounting for the remainder.

Solubility: TFA salts generally enhance the solubility of peptides in aqueous solutions.

In Biological Assays: For most standard in vitro assays, the residual TFA levels do not cause interference. However, for highly sensitive cellular or biochemical studies, please be aware of its presence.