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LL37 – Human cathelicidin peptide – Potent antimicrobial peptide

LL-37 peptide, also known as CAP-18 for Cathelicidin antimicrobial peptide 18, is a 37 amino acid cationic peptide. LL37 is also a typical linear antimicrobial peptide which can eliminate a wide range of pathogenes, including bacteria, viruses, fungi, and parasites. CAP-18 is the only human cathelicidin peptide reported yet, found in lysosomes of macrophages and leukocytes.
LL-37 plays an important role in the first act of defense against local infection and systemic invasion of pathogens at sites of inflammation.
CAP-18 shows cytotoxicity against bacterial and normal eukaryotic cells and is significantly resistant to proteolytic degradation. Besides its antimicrobial functions, CAP-18 also has immunomodulatory roles. LL37 suppresses the production of pro-inflammatory cytokines, TNF-α and IL-6 in infected monocytes. CAP-18 increases cytokine and chemokine liberation from local cells and leucocytes and has chemotactic effects on a large number of immune cells.

SB-PEPTIDE offers the scrambled version of LL-37 peptide (see section « Scrambled LL-37 peptide »).


LL37 – Technical specification

LL-37 peptide synthesis MW : 4 493.4 Da (C205H340N60O53)
LL-17 peptide price Purity : > 95%
Peptide Library synthesis service Counter-Ion : TFA Salts (see option TFA removal)
Peptide library synthesis LL-37 peptide Delivery format : Freeze dried in propylene 2mL microtubes
buy synthesized peptides Other names : Cathelicidin,154947-66-7, All38 peptide, BAC4, CAP18, CAMP, 
peptide solubility guidelines Peptide Solubility Guideline
buy peptide price Bulk peptide quantities available


Product catalog Size Price € HT Price $ USD
SB004-1MG 1 mg  115  134
SB004-5*1MG 5×1 mg  400  469
SB004-10*5MG 10×5 mg 1300 1625



1- Sheehan, Gerard et al. Infection and immunity vol. 86,7 e00097-18. (2018)
LL-37 peptide referenceThe Human Cathelicidin Antimicrobial Peptide LL-37 Promotes the Growth of the Pulmonary Pathogen Aspergillus fumigatus


BACKGROUND: The pulmonary mucus of cystic fibrosis (CF) patients displays elevated levels of the cathelicidin antimicrobial peptide LL-37.

OBJECTIVE: Assess the effect of LL-37 on the growth of Aspergillus fumigatus, a common pathogen of CF patients.

METHOD/RESULTS: Exposure of A. fumigatus to LL-37 and its derived fragment RK-31 (1.95 μg/ml) for 24 h had a positive effect on growth (199.94% ± 6.172% [P < 0.05] and 218.20% ± 4.63% [P < 0.05], respectively), whereas scrambled LL-37 peptide did not (85.12% ± 2.92%). Exposure of mycelium (preformed for 24 h) to 5 μg/ml intact LL-37 for 48 h increased hyphal wet weight (4.37 ± 0.23 g, P < 0.001) compared to the control (2.67 ± 0.05 g) and scrambled LL-37 (2.23 ± 0.09 g) treatments. Gliotoxin secretion from LL-37 exposed hyphae (169.1 ± 6.36 ng/mg hyphae, P < 0.05) was increased at 24 h compared to the results seen with the control treatment (102 ± 18.81 ng/mg hyphae) and the scrambled LL-37 treatment (96.09 ± 15.15 ng/mg hyphae). Shotgun proteomic analysis of 24-h LL-37-treated hyphae revealed an increase in the abundance of proteins associated with growth (eukaryotic translation initiation factor 5A [eIF-5A] [16.3-fold increased]), tissue degradation (aspartic endopeptidase [4.7-fold increased]), and allergic reactions (Asp F13 [10-fold increased]). By 48 h, there was an increase in protein levels indicative of cellular stress (glutathione peroxidase [9-fold increased]), growth (eIF-5A [6-fold increased]), and virulence (RNase mitogillin [3.7-fold increased]).

CONCLUSION: These results indicate that LL-37 stimulates A. fumigatus growth and that this stimulation can result in increased fungal growth and secretion of toxins in the lungs of CF patients.T