Three letter code
Peptide Purity (HPLC)
BAR peptide is comprised of residues 1167 to 1193 of the SspB (Antigen I/II) protein sequence of S. gordonii (NH2-LEAAPKKVQDLLKKANITVKGAFQLFS-COOH). BAR peptide was developed that potently inhibits P. gingivalis/S. gordonii adherence in vitro and reduces P. gingivalis virulence in a mouse model of periodontitis. While efficacious, one of the challenges to free BAR administration is that it provides relatively transient inhibition of P. gingivalis in the oral cavity. Moreover, to treat established biofilms, relative to initial biofilm formation, higher concentrations of BAR are required.
Ideally BAR peptide should be stored in a freezer at or below -9C. BAR peptide should be refrigerated after reconstitution. For more details, please refer to the manual:Handling and Storage of Synthetic Peptides
- Daep, C. A., Novak, E. A., Lamont, R. J., and Demuth, D. R. (2011) Structural Dissection and in vivo Effectiveness of a Peptide Inhibitor of Porphyromonas gingivalis Adherence to Streptococcus gordonii. Infect. Immun. 79, 67−74.
About TFA salt
Trifluoroacetic acid (TFA) is a strong acid, which is commonly used to cleave synthesized peptides from solid-phase resins and is also used to improve HPLC performance in the peptide purification step. By default, custom peptides are delivered as lyophilized TFA salts, and can contain as much as 10-45% TFA.
TFA in custom peptides can cause inexplicable discrepancies in subsequent assay data. For instance, TFA in nM concentrations has been shown to interfere with cellular assays, inhibiting cellular proliferation in some instances, and increasing cell viability in others . It has also been found to be an unintended allosteric modulator of the glycine receptor, GlyR.
TFA Removal Service is recommended for:
- Peptides that will be used in cellular assays
- Peptides that will be used as APIs or in manufactured products
- For hydrophilic peptides containing numerous basic residues
Related Products / Services
• Peptide Services: NovoPro's peptide synthesis services include standard chemical peptide synthesis, peptide modification, peptide libraries, and recombinant peptide expression.
• Standard Peptide Synthesis: NovoPro offers quality peptides at the most competitive prices in the industry, starting at $3.20 per amino acid. NovoPro provides PepBox – Automatic Quote Tool for online price calculation.
• Peptide Modifications: NovoPro offers a wide range of peptide modification services including isotope labeling (2H, 15N, and 13C), multiple disulfide bonds, multiple phosphorylations, KLH, BSA, ovalbumin, amidation, acetylation, biotin, FITC, etc.
Please note: All products are "FOR RESEARCH USE ONLY AND ARE NOT INTENDED FOR DIAGNOSTIC OR THERAPEUTIC USE"