Marine Antimicrobial Peptides

Every fish, shrimp and crab carries a private arsenal. Living in water teeming with bacteria, viruses and fungi, marine animals defend themselves with antimicrobial peptides — short, positively charged molecules, typically a couple of dozen amino acids long, that punch through microbial membranes and shut down pathogens that conventional antibiotics increasingly miss. Found in skin mucus, gills, blood cells and digestive tissues, these peptides are among the most promising natural templates for the post-antibiotic era. Eata Marisource supplies marine antimicrobial peptides as research reagents and industrial ingredients, in extracted, purified and custom synthesized forms.

What makes marine AMPs stand out from their terrestrial cousins is chemical diversity. Salt water has pushed evolution down paths no land animal has travelled, producing families such as the piscidins of fish, the penaeidins and crustins of shrimps and crabs, and the defensins of oysters — molecules with broad-spectrum activity, thermal stability and mechanisms that are hard for bacteria to evade. The catalogue below shows the forms we hold, from crude extracts to >95% pure lyophilized peptides.

Why the Sea Keeps Winning

Marine organisms have been refining their defence chemistry for hundreds of millions of years, and their peptides work differently from most antibiotics in use today:

• Membrane-first action — cationic, amphipathic peptides bind electrostatically to negatively charged microbial membranes, then disrupt them through carpet, barrel or toroidal mechanisms that are difficult to resist.
• Broad spectrum — active against Gram-positive and Gram-negative bacteria, fungi and enveloped viruses, including multi-drug resistant strains such as MRSA.
• Biofilm activity — several marine AMPs penetrate and dismantle biofilms, a key target in fouling control and persistent infection research.
• Stability in demanding conditions — many marine peptides tolerate heat and wide pH ranges, surviving the environments where fish and shellfish actually live.
• A natural design template — sequence families and structure-activity data that researchers use to engineer improved analogues.

Product Range

We supply marine AMPs at every stage of the research pipeline:

• Crude marine peptide extracts — enzymatically released peptide fractions from fish and shellfish tissues, for screening and activity mining.
• Purified natural AMPs — chromatography-purified peptides with sequence-confirmed identity and defined antimicrobial activity.
• Lyophilized peptide powders — salt-free, freeze-dried material for reconstitution in assay buffers, supplied in vials or tubes.
• Synthetic AMP analogues — solid-phase synthesized peptides based on marine templates, with custom length, charge and modifications.
• Screening peptide panels — curated sets of marine AMP sequences for MIC testing and structure-activity comparisons.
• Application-grade materials — peptide preparations for aquafeed, preservation and anti-fouling development projects.

Families We Supply

The marine AMP landscape is organised into structural families, each with its own activity profile. We supply the main lineages and their close relatives:

• Piscidins and pleurocidins — linear, amphipathic peptides from fish skin and mast cells, active against aquatic and terrestrial pathogens.
• Hepcidins and defensins — cysteine-rich peptides from fish tissues and oyster hemocytes, with potent activity against key aquatic bacteria.
• Penaeidins and crustins — the major AMP families of shrimps and crabs, including the disulfide-rich WAP-domain crustins.
• Anti-lipopolysaccharide factors (ALF) — shrimp-derived peptides that target the bacterial outer membrane and neutralize LPS.
• Histone-derived and cathelicidin peptides — a growing group recovered from marine immune tissues with broad-spectrum activity.
• Peptaibols and microbial AMPs — antifungal peptides from marine fungi, active against multi-drug resistant bacteria.

Product Portfolio at a Glance

Table 1 — Product Portfolio at a Glance

How Marine AMPs Act

Understanding mechanism is what turns a peptide into a research tool. Most marine AMPs are cationic (net charge roughly +2 to +9) and amphipathic, so their first move is electrostatic: they are drawn to the negatively charged surfaces of bacterial membranes. From there the action branches:

• Membrane disruption — carpet, barrel-stave and toroidal-pore models describe how peptides accumulate on, insert into and break open the lipid bilayer.
• Intracellular targeting — some AMPs cross the membrane intact and bind DNA, blocking transcription and translation from the inside.
• Biofilm interference — several marine peptides prevent biofilm formation and disperse established communities, acting on the matrix as well as the cells.
• Low host toxicity — selectivity for microbial membranes over host membranes, a property researchers quantify with haemolysis and cytotoxicity assays.

Quality and Data

• Purity and identity — HPLC purity, mass-spectrometry confirmation and, for natural products, sequence evidence per lot.
• Activity documentation — MIC values against reference strains, with assay conditions stated, where available.
• Salt and counterion control — acetate or TFA forms, residual-solvent data and endotoxin levels on request.
• Batch traceability — source species, extraction or synthesis records, and a certificate of analysis with every shipment.
• Stability guidance — recommended storage, reconstitution and handling for lyophilized material.

Custom Peptide Solutions

A research project rarely wants exactly the catalogued peptide, and that is where we shine:

• Custom sequences — native marine AMPs, analogues and chimeras synthesized to your specification.
• Rational modification — charge, hydrophobicity and length adjusted for potency, selectivity or stability targets.
• Modifications and labels — amidated, acylated, fluorescently or biotin-labelled peptides for mechanism studies.
• Scaling — from milligram assay quantities to gram- and kilogram-level material for industrial pilots.

Tell us the target organism, the assay or the sequence you have in mind, and we will propose a marine AMP solution built around it. Contact Eata Marisource with your requirements and we will take it from there.

For Research or Industrial Raw Materials, Not For Personal Medical Use!