Tat-CIRP peptide

Tat-CIRP peptide

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

Batch to batch variation of the purity

H-YGRKKRRQRRRGRGFSRGGGDRGYGG-OH

H-Tyr-Gly-Arg-Lys-Lys-Arg-Arg-Gln-Arg-Arg-Arg-Gly-Arg-Gly-Phe-Ser-Arg-Gly-Gly-Gly-Asp-Arg-Gly-Tyr-Gly-Gly-OH

26

95.46%

C₁₂₃H₂₀₆N₅₆O₃₃

2997.29

Synthetic

Powder

Tat-CIRP is a peptide derived from the high affinity binding region of cold-inducible RNA binding protein (CIRP) which competitively binds to myeloid differentiation factor 2 (MD2) and blocks the MD2-CIRP interaction. MD2 is an essential accessory protein for Toll like receptor 4 (TLR4) activation and blocking the function of MD2 and TLR4 with Tat-CIRP is neuroprotective, reducing apoptosis and necroptosis in vitro. In vivo, Tat-CIRP is neuroprotective against ischemic and hemorrhagic stroke in mice and reduces brain infarct volume and preserves neurological function in rhesus monkeys 30 days after ischemic stroke.

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

• Fang et al (2021) An MD2-perturbing peptide has therapeutic effects in rodent and rhesus monkey models of stroke. Sci Transl Med. 13(597) eabb6716 PMID: 34108252

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.