R18 peptide

R18 peptide

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

Batch to batch variation of the purity

H-PHCVPRDLSWLDLEANMCLP-OH

H-Pro-His-Cys-Val-Pro-Arg-Asp-Leu-Ser-Trp-Leu-Asp-Leu-Glu-Ala-Asn-Met-Cys-Leu-Pro-OH

20

95.03%

C₁₀₁H₁₅₇N₂₇O₂₉S₃

2309.67

Synthetic

Powder

R18, also known as R18 peptide is an antagonist of 14.3.3 proteins, a family of conserved regulatory molecules that have the ability to bind a multitude of functionally diverse signaling proteins, with a KD of approximately 80 nM. R18 competitively inhibits 14.3.3 ligand interactions without requiring phosphorylation and can block the ability of 14.3.3 to bind to target proteins such as Raf-1, Bad, ASK1 and exoenzyme S.

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

• Wang et al (1999) Isolation of high-affinity peptide antagonists of 14.3.3 proteins by phage display. Biochemistry 38 12499 PMID: 10493820
• Masters et al (2002) Survival-promoting functions of 14.3.3 proteins. Biochem.Soc.Transactions 30 360 PMID: 12196095
• De Vries-van Leeuwen et al (2013) ERα activation is controlled by 14-3-3 proteins. Proc. Nat. Acad. Sci. 110(22) 8894 DOI: 10.1073/pnas.1220809110

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.