Mass-Producing a Crab-Derived Antimicrobial Peptide That Kills Foodborne Bacteria | Research

The takeaway

A marine antimicrobial peptide from mud crab was produced at high yield (126.1 mg/L) using engineered yeast, showing potent activity against foodborne pathogens with no toxicity to human cells.

126.1 mg/L — a 2.75× production boost
Using multicopy gene engineering in yeast, researchers nearly tripled the production of a marine antimicrobial peptide, addressing the key manufacturing barrier to using natural peptides in food preservation.

What the researchers found

Researchers achieved high-yield production of the marine antimicrobial peptide Spgillcin177-189 using a multicopy yeast expression system in Pichia pastoris. The multicopy strategy yielded 126.1 mg/L — 2.75 times more than single-copy strains. The recombinant peptide showed potent activity against multiple foodborne pathogens (MIC range 5.25–84 μg/mL), effective bactericidal and anti-biofilm activity against S. aureus and V. parahaemolyticus, good heat stability, and no significant cytotoxicity or hemolysis.

The peptide works by targeting bacterial cell membranes via hydrogen bonding with surface components, disrupting membrane integrity and causing cell death.

Why it matters

Antibiotic resistance in foodborne bacteria and consumer demand for chemical-free food preservation are creating urgent need for natural antimicrobial alternatives. This study solves a key manufacturing bottleneck — producing enough antimicrobial peptide affordably — which is essential for any real-world food safety application.

The numbers in context

126.1 mg/L yield · 2.75× improvement over single-copy · MIC 5.25–84 μg/mL · active against S. aureus and V. parahaemolyticus · no cytotoxicity or hemolysis

How the study worked

Established a Pichia pastoris yeast expression system for recombinant Spgillcin177-189 production. Used Golden Gate assembly technology to construct multicopy plasmids for enhanced expression. Tested antibacterial activity (MIC), bactericidal activity, anti-biofilm activity, thermostability, cytotoxicity, and hemolytic activity. Investigated the mechanism of bacterial membrane disruption.

Who was studied

In vitro study testing a recombinant marine antimicrobial peptide against foodborne bacterial pathogens

What this study cannot tell us

This is an in vitro production and characterization study. The peptide has not been tested in actual food preservation applications or in vivo. Scale-up from laboratory to industrial production remains to be demonstrated. Activity against a limited panel of foodborne pathogens was tested.

How to read the evidence

Rated preliminary because this is an in vitro production and characterization study. While the engineering and antimicrobial results are promising, the peptide has not been tested in food applications or in vivo.

When this study was published

Published in 2025 in Probiotics and Antimicrobial Proteins. This is very recent work addressing the active challenge of scalable antimicrobial peptide manufacturing.

The bigger picture

The food industry needs alternatives to chemical preservatives and antibiotics as resistance grows and consumers demand cleaner labels. Antimicrobial peptides are promising but have been held back by high production costs. This multicopy yeast expression strategy addresses the manufacturing problem directly, bringing AMP-based food preservation closer to commercial viability.

Questions still open

Can this production system scale to industrial volumes while maintaining the peptide's antimicrobial potency?
How does Spgillcin177-189 perform when applied to actual food products rather than bacterial cultures in the lab?
Could this multicopy expression strategy be adapted for other antimicrobial peptides that face the same production bottleneck?

Common questions

Where does this antimicrobial peptide come from?

Spgillcin177-189 was originally discovered in the mud crab Scylla paramamosain. Rather than extracting it from crabs, the researchers engineered baker's yeast (Pichia pastoris) to produce it in large quantities using recombinant DNA technology.

Could this peptide replace antibiotics in food production?

That's the goal. The peptide kills foodborne bacteria like Staph aureus at low concentrations, resists heat, and doesn't harm human cells. But it still needs to be tested in actual food products and scaled to industrial production before it could replace chemical preservatives or antibiotics.

Read the original research

Multicopy Expression of the Marine Antimicrobial Peptide Spgillcin177-189 in Pichia pastoris for High-Yield Production and Potent Activity Against Foodborne Pathogens.

Probiotics and antimicrobial proteins

View on PubMed ↗Publisher’s paper ↗

Citation

Dong, Xianxian; Liao, Huiliang; Zhang, Chang; Chen, Fangyi; Peng, Hui; Hong, Xiao; Hao, Hua; Xiong, Ming; Ma, Jiahao; Wang, Ke-Jian. (2025). Multicopy Expression of the Marine Antimicrobial Peptide Spgillcin177-189 in Pichia pastoris for High-Yield Production and Potent Activity Against Foodborne Pathogens.. Probiotics and antimicrobial proteins. https://doi.org/10.1007/s12602-025-10874-y