Three encrypted antimicrobial peptides from human MMP-19 showed broad-spectrum antibacterial, antibiofilm, and antiviral activity with synergistic antibiotic combinations and no resistance development.
Zero resistanceBacteria could not develop resistance to these human-derived peptides even after serial passaging
What the researchers found
Three EPs from MMP-19 showed broad-spectrum antimicrobial activity (including MDR strains), antibiofilm, antiviral, LPS-neutralizing, and synergistic properties, with no resistance development and in vivo efficacy in a murine skin infection model.
Why it matters
Finding potent antimicrobials hidden in our own proteins means the human body has an untapped reservoir of anti-infective peptides that are inherently compatible with human biology.
How the study worked
Peptide identification from MMP-19 sequence, antimicrobial and antiviral assays, membrane depolarization/permeabilization studies, biofilm assays, synergy testing, serial passaging for resistance, D-amino acid analog synthesis, and murine skin infection model.
What this study cannot tell us
Only one protein (MMP-19) mined. In vivo testing limited to skin infection. Pharmacokinetics and systemic efficacy unknown. D-amino acid analogs are expensive to produce at scale.
How to read the evidence
Comprehensive discovery-to-in-vivo study with multiple functional characterizations. Novel concept with strong preclinical validation.
When this study was published
Published in 2025.
The bigger picture
Proteome mining—searching human proteins for hidden antimicrobial sequences—is a novel drug discovery strategy that could yield thousands of host-compatible anti-infective peptides.
Questions still open
- How many encrypted antimicrobial peptides exist across the human proteome?
- Could encrypted peptides from other MMPs show complementary antimicrobial spectra?
- Would systemic administration of these peptides be safe and effective?
Common questions
What are encrypted peptides?
Could our own proteins become antibiotics?
Read the original research
Discovery of Encrypted Peptides in a Human Matrix Metallopeptidase.
JACS Au, 6(1), 124-143
Citation
Gaglione, Rosa; Schibeci, Martina; Piccolo, Erika; Culurciello, Rosanna; Zannella, Carla; Mensitieri, Francesca; Dal Piaz, Fabrizio; Cafaro, Valeria; De Filippis, Anna; Pizzo, Elio; Notomista, Eugenio; Torres, Marcelo D T; de la Fuente-Nunez, Cesar; Arciello, Angela. (2026). Discovery of Encrypted Peptides in a Human Matrix Metallopeptidase.. JACS Au, 6(1), 124-143. https://doi.org/10.1021/jacsau.5c00947