Antimicrobial · Antimicrobial Peptide (AMP)
Thanatin
An insect-derived AMP that uniquely targets the Bam complex in Gram-negative bacteria, used to study outer membrane biogenesis and as a research tool.
- Length
- 21 amino acids
- Half-life
- Not well characterised
- Mechanism
- Thanatin binds to lipopolysaccharide (LPS) and disrupts the assembly of the Bam complex, a key machinery for outer membrane biogenesis in Gram-negative bacteria.
- Studied in
- Research investigates its unique mechanism targeting bacterial outer membrane assembly, making it a valuable tool for studying antibiotic resistance and bacterial physiology.
About Thanatin
Thanatin is a 21-amino-acid cationic antimicrobial peptide originally isolated from the spined soldier bug, *Podisus maculiventris*. It is structurally distinct from many other AMPs, featuring a disulfide bridge that constrains its C-terminal region into a beta-hairpin structure. This rigid structure is critical for its specific biological activity.
Unlike AMPs that permeabilise membranes, Thanatin has a highly specific molecular target. It binds to lipopolysaccharide (LPS) and components of the β-barrel assembly machinery (BAM) complex, particularly BamA, in the outer membrane of Gram-negative bacteria. This interaction disrupts the proper insertion of outer membrane proteins, leading to envelope stress and cell death, a mechanism that is a major focus of current antimicrobial research.
Laboratory notes
- The presence of the disulfide bond is critical for activity; ensure reducing agents are absent from buffers unless investigating the role of this bond.
- Its activity is highly specific to Gram-negative bacteria; it generally shows little to no activity against Gram-positive bacteria or fungi.
- Use genetic or biochemical assays that monitor outer membrane integrity or the function of the BAM complex to study its mechanism.
Storage and reconstitution basics: storage guide.
Questions about Thanatin
What is the BAM complex?
The β-barrel Assembly Machinery (BAM) complex is an essential protein complex found in the outer membrane of Gram-negative bacteria. Its function is to fold and insert β-barrel proteins into the outer membrane.
Why is targeting the BAM complex a novel antimicrobial research strategy?
Most antibiotics target processes like cell wall synthesis or protein synthesis. Targeting the assembly of the outer membrane itself is a different approach and is of research interest for circumventing existing resistance mechanisms.
What does the disulfide bridge in Thanatin do?
The covalent bond between two cysteine residues forms a loop in the peptide backbone. This constrains the peptide's conformation, creating a rigid β-hairpin structure that is necessary for its high-affinity binding to its molecular target.
Is Thanatin for human use?
No. It is supplied strictly for in-vitro laboratory research and is not for human or animal consumption.
Related research peptides
All products are sold for laboratory research use only. Not for human consumption, not a medicine, not for diagnosing, treating or preventing any condition.