Melanotan II (MT-2)

What molecular class does MT-2 belong to?

MT-2 is a cyclic heptapeptide, formed through a lactam bridge linking two amino acid residues. It is a synthetic analogue of alpha melanocyte stimulating hormone (alpha MSH), an endogenous melanocortin peptide. Cyclisation confers greater metabolic stability in laboratory assays and extends receptor interaction time relative to the linear parent peptide, which is why it is frequently used as a reference compound in structure activity research.

How does MT-2 relate to MC1R and MC4R receptors?

In receptor binding studies, MT-2 behaves as a non-selective agonist across the melanocortin receptor family, showing affinity for both MC1R and MC4R. MC1R is primarily expressed on melanocytes in cell models and is examined in vitro for signal transduction pathways. MC4R is expressed in central nervous system tissue within preclinical animal models and is studied within receptor pharmacology research. Because MT-2 engages multiple receptor subtypes concurrently, it commonly serves as a comparator against more selective melanocortin analogues.

Which research areas use MT-2?

Laboratories apply MT-2 primarily within three frameworks: in vitro receptor binding assays that characterise agonist activity and potency, structure activity relationship studies comparing cyclic peptide variants for receptor affinity, and preclinical animal models investigating the role of melanocortin signalling within physiological regulatory systems. These applications remain strictly experimental and confined to controlled laboratory settings.

Why does a certificate of analysis matter for MT-2?

A certificate of analysis (CoA) confirms peptide identity and purity through mass spectrometry and HPLC. For researchers this is essential for reproducible outcomes: variation in purity or unintended degradation products can distort binding data and signal transduction measurements. A documented CoA per batch supports the traceability that peer reviewed research requires.