P9R peptide

P9R peptide

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

Batch to batch variation of the purity

H-NGAICWGPCPTAFRQIGNCGRFRVRCCRIR-OH

H-Asn-Gly-Ala-Ile-Cys-Trp-Gly-Pro-Cys-Pro-Thr-Ala-Phe-Arg-Gln-Ile-Gly-Asn-Cys-Gly-Arg-Phe-Arg-Val-Arg-Cys-Cys-Arg-Ile-Arg-OH

30

95.41%

C₁₄₄H₂₃₂N₅₂O₃₅S₅

3412.02

Synthetic

Powder

P9R is a defensin-like peptide that exhibits potent antiviral activity against pH-dependent viruses, including the avian influenza A(H7N9) virus, coronaviruses (SARS-CoV-2, MERS-CoV and SARS-CoV), and the non-enveloped rhinovirus. The antiviral activity of P9R depends on direct binding to viruses and inhibition of virus-host endosomal acidification but when P9R was added to cells after SARS-CoV-2 infection, P9R could significantly inhibit viral replication. P9R can also protect mice in lethal challenge models.

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

• Zhao et al (2020) A broad-spectrum virus- and host-targeting peptide against respiratory viruses including influenza virus and SARS-CoV-2. Nat Commun. 11 4252 PMID: 32843628

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.