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Indolicidin Catalog No.GC32207

Size Price Stock Qty
500μg
$143.00
In stock
1mg
$232.00
In stock
5mg
$696.00
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Sample solution is provided at 25 µL, 10mM.

Protocol

Cell experiment:

The time course and dose dependence of indolicidin bactericidal activity are determined using Escherichia coli ML35 and Staphylococcus aureus 502A as test organisms. The assays are performed in 10 mM sodium phosphate buffer, pH 7.4, at 37°C. A 50 μg sample of indolicidin is dissolved in 50 pl of 0.1 M pyridine acetate, pH 6.5, and incubated with 5 μg of chymotrypsin for 15 h at 37°C. Digestion of the sample is confirmed by the disappearance of the indolicidin band on acid-urea PAGE. Following lyophilization, untreated and digested samples are tested for antibacterial activity in a agar diffusion assay against Escherichia coli using concentrations of peptide ranging from 10 to 300 μg/mL[1].

References:

[1]. Selsted ME, et al. Indolicidin, a novel bactericidal tridecapeptide amide from neutrophils. J Biol Chem. 1992 Mar 5;267(7):4292-5.
[2]. Falla TJ, et al. Mode of action of the antimicrobial peptide indolicidin. J Biol Chem. 1996 Aug 9;271(32):19298-303.

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Chemical Properties

Cas No. 140896-21-5 SDF Download SDF
Synonyms N/A
Chemical Name N/A
Canonical SMILES Ile-Leu-Pro-Trp-Lys-Trp-Pro-Trp-Trp-Pro-Trp-Arg-Arg-NH2
Formula C100H132N26O13 M.Wt 1906.28
Solubility Soluble in DMSO Storage Store at -20°C
General tips For obtaining a higher solubility , please warm the tube at 37 ℃ and shake it in the ultrasonic bath for a while.Stock solution can be stored below -20℃ for several months.
Shipping Condition Evaluation sample solution : ship with blue ice
All other available size: ship with RT , or blue ice upon request

Background

Indolicidin is a potent antimicrobial peptide purified from the cytoplasmic granules of bovine neutrophils.

Indolicidin is comprised of 13 amino acids, 5 of which are tryptophan residues, and the carboxylterminal arginine is carboxamidated. Indolicidin has the highest tryptophan content of any known protein. The multiple tryptophan residues may play an important role in the function of this unique antibiotic peptide. Indolicidin is a tridecapeptide amide which possesses in vitro bactericidal activities comparable with the most active of the defensin or bactenecin peptides[1]. Indolicidin binds purified surface lipopolysaccharide with high affinity and permeabilized the outer membrane of Escherichia coli to the small hydrophobic molecule 1-N-phenylnapthylamine (Mr 200), results consistent with indolicidin crossing the outer membrane via the self-promoted uptake pathway. The methyl esterification of indolicidin’s carboxyl terminus increases its activity for Gram-negative and Gram-positive bacteria. In Gram-negative bacteria this is associated with an increased binding to lipopolysaccharide and increased permeabilization of the outer membrane. The cytoplasmic membrane is the site of action of indolicidin as assayed in Escherichia coli by the unmasking of cytoplasmic beta-galactosidase due to membrane permeabilization[2].

[1]. Selsted ME, et al. Indolicidin, a novel bactericidal tridecapeptide amide from neutrophils. J Biol Chem. 1992 Mar 5;267(7):4292-5. [2]. Falla TJ, et al. Mode of action of the antimicrobial peptide indolicidin. J Biol Chem. 1996 Aug 9;271(32):19298-303.