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Product Name
Polybia-MPI peptide (TFA removed)
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Documents
Batch to batch variation of the purity
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Sequence Shortening
IDWKKLLDAAKQIL-NH2
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Sequence
H-Ile-Asp-Trp-Lys-Lys-Leu-Leu-Asp-Ala-Ala-Lys-Gln-Ile-Leu-NH2
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Length (aa)
14
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Peptide Purity (HPLC)
97.2%
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Molecular Formula
C78H132N20O19
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Molecular Weight
1654
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CAS No.
872043-01-1
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Source
Synthetic
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Form
Powder
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Description
Have anti-biofilm and antifungal activities against C. albicans and C. glabrata (Wang K et al. 2014). A mast cell lytic peptide, chemotaxis for polymorphonucleated leukocytes (PMNL). Not toxic to rat erythrocytes. Helix in SDS or TFE. Replacement of residue 7, 8, or 9 by a proline led to reduced helicity as well as antitumor activity (Wang et al. 2008) Peptides 29: 963-968. Animal model:mouse: A single atom change (CO-NH2 to CS-NH2) of MPI improved peptide stability to serum proteases and better inhibited sarcoma xenograft tumor (S180) growth from 18 (WT) to 38% (mutant) using a Kunming mouse model (Zhang W et al. 2010 Peptides 31:1832-8). Updated 9/6/12; 3/2014 GW. Polybia-MPI has Antibacterial activity. Polybia-MPI was found in venom, social wasp, Polybia paulista.
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Storage Guidelines
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
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References
- Souza BM, Mendes MA, Santos LD, et al. Structural and functional characterization of two novel peptide toxins isolated from the venom of the social wasp Polybia paulista. Peptides. 2005;26(11):2157-64.
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About TFA salt
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.
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Molar Concentration Calculator
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Dilution Calculator
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Percent Concentration Calculator
Mass (g) = Concentration (mol/L) × Volume (L) × Molecular Weight (g/mol)
Peptide Property
- Analysed Sequence:A
- Chemical Formula:A
- Sequence length:A
- Extinction coefficient:A M-1cm-1
- GRAVY:A
- Mw average:A
- Theoretical pI:A
- Data Source:Peptide Property Calculator
GRAVY = grand average of hydropathy
X: Hydrophobic uncharged residues, like F I L M V W A and P
X: Basic residues, like R K H
X: Acidic residues, like D E
X: Polar uncharged residues, like G S T C N Q and Y
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