RI-EIP1 (Retroinverso EIP1) peptide

RI-EIP1 (Retroinverso EIP1) peptide

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

H-GRRRQRRKKRGGTFLYPPL-OH (All D-amino acids)

H-D-Gly-D-Arg-D-Arg-D-Arg-D-Gln-D-Arg-D-Arg-D-Lys-D-Lys-D-Arg-D-Gly-D-Gly-D-Thr-D-Phe-D-Leu-D-Tyr-D-Pro-D-Pro-D-Leu-OH

19

95.2%

C₁₀₃H₁₇₆N₄₀O₂₃

2342.74

Synthetic

Powder

Retroinverso(RI), RI-EIPs suppress tumor growth, intravasation, and metastasis in vivo. Transcription factors play a key role in the development of diverse cancers, and therapeutically targeting them has remained a challenge. In prostate cancer, the gene encoding the transcription factor ERG is recurrently rearranged and plays a critical role in prostate oncogenesis. Dr. Xiaoju Wang identified a series of peptides that interact specifically with the DNA binding domain of ERG. ERG inhibitory peptides (EIPs) and derived peptidomimetics bound ERG with high affinity and specificity, leading to proteolytic degradation of the ERG protein. The EIPs attenuated ERG-mediated transcription, chromatin recruitment, protein-protein interactions, cell invasion and proliferation, and tumor growth. Thus, peptidomimetic targeting of transcription factor fusion products may provide a promising therapeutic strategy for prostate cancer as well as other malignancies.

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., Development of Peptidomimetic Inhibitors of the ERG Gene Fusion Product in Prostate Cancer, Cancer Cell (2017).

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.