Overview
Melittin is a 26-amino acid peptide and the primary cytotoxic component of honeybee (Apis mellifera) venom. It accounts for 40-60% of venom's dry weight and is responsible for the immediate pain and inflammation associated with bee stings. Despite its toxicity, melittin has garnered significant scientific interest due to its unique membrane-lytic properties and therapeutic potential. First isolated in the 1960s, melittin has become a model compound for studying peptide-membrane interactions. Its amphipathic structure enables pore formation in lipid bilayers, disrupting cellular integrity. This mechanism underlies both its toxicity and its investigational applications in drug delivery and antimicrobial therapies.
Physical and Chemical Properties
Melittin (C131H229N39O31) is a linear peptide with a molecular weight of 2846.5 g/mol. Its primary structure contains predominantly hydrophobic residues (positions 1-20) followed by hydrophilic amino acids (21-26), creating a distinctive amphipathic character. This configuration allows spontaneous insertion into biological membranes. The peptide exhibits remarkable thermal stability, maintaining activity after brief exposure to 100°C. It readily dissolves in aqueous solutions (water, PBS) and polar organic solvents like methanol. Analytical characterization typically employs HPLC (>95% purity standard) and mass spectrometry. Lyophilized preparations appear as white powders with long-term stability when stored at -20°C.
Main Applications
In pharmaceutical research, melittin serves as a prototype for membrane-active peptides and drug delivery systems. Its ability to permeabilize cell membranes is being harnessed for targeted cancer therapies, where melittin-loaded nanoparticles selectively destroy tumor cells. Clinical trials explore its potential in treating melanoma and breast cancer. Melittin demonstrates broad-spectrum antimicrobial activity against Gram-positive bacteria (including MRSA), fungi, and protozoa. Research investigates its use as an alternative to conventional antibiotics, particularly for drug-resistant infections. Additionally, it modulates immune responses, showing promise in autoimmune disease management and vaccine adjuvant development.
Safety and Storage
As a potent cytolytic agent, melittin requires stringent safety protocols. Laboratory handling mandates gloves, goggles, and fume hoods to prevent inhalation or skin contact. Even microgram quantities can cause hemolysis and tissue damage. Emergency procedures should include immediate irrigation for eye/skin exposure and medical attention for systemic reactions. For storage, lyophilized melittin remains stable for years at -20°C in moisture-proof containers. Reconstituted solutions should be used immediately or stored at 4°C for ≤24 hours with bacteriostatic agents. Avoid repeated freeze-thaw cycles, which may degrade peptide integrity. Facilities must maintain Material Safety Data Sheets (MSDS) and comply with local regulations for toxic substances.
B2B Procurement Guide
Research-grade melittin is typically sold in 1mg to 100mg quantities, with prices ranging from $200-$500 per mg depending on purity (HPLC ≥95-99%) and supplier reputation. Bulk orders (gram scale) may qualify for 15-30% discounts. Key procurement considerations include certificate of analysis (COA) verification for purity, endotoxin levels (<0.1 EU/μg for in vivo use), and sequence confirmation by mass spectrometry. Reputable suppliers provide custom synthesis services for modified variants (e.g., fluorescent labeling, D-amino acid substitutions). Buyers should evaluate vendor GMP compliance for clinical-grade material and request stability data. For international shipments, verify that the supplier can handle temperature-controlled logistics and customs documentation for regulated peptides.
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