BULKGLP RESEARCH LIBRARY
Is Tirzepatide a Peptide?
Published
Yes. Tirzepatide is a synthetic, 39-amino-acid peptide that activates both the GIP receptor and the GLP-1 receptor in laboratory assays. Its development code is LY3298176.
At a glance
- A single peptide molecule contains 39 amino-acid residues.
- Dual agonism means activity at GIPR and GLP-1R.
- A C20 fatty diacid side chain is attached through a linker at lysine 20.
What makes it a peptide?
Peptides consist of amino-acid residues joined by peptide bonds. Tirzepatide retains that backbone even though its structure includes chemical modifications. Adding a lipid side chain changes the molecule’s properties; it does not remove its classification as a peptide.
- Backbone
- A modified sequence based on GIP, with 39 residues.
- Selected modifications
- Aminoisobutyric acid at positions 2 and 13, a C-terminal amide and the linked C20 fatty diacid.
- Receptor targets
- GIPR and GLP-1R, two distinct G protein-coupled receptors.
These structural features were described in the original compound characterization by Coskun and colleagues. The exact sequence, termini and lipid attachment belong in the molecular specification.
How to interpret dual receptor activity
Binding affinity measures receptor interaction; a functional assay measures a response, such as intracellular cyclic AMP. Those results are different quantities. Comparing reported values requires the same receptor species, cell system, incubation conditions and assay endpoint. A dual-target label does not mean equal activity at both receptors. The receptor mechanisms overview explains that distinction.
Check the material, then the report
For Tirzepatide Research Vials, match the product name, formulation and received lot to the corresponding report. Confirm that the reported molecular mass applies to the complete modified molecule. Chromatographic purity alone does not prove sequence or receptor activity; consult the COA interpretation guide for the separate identity and purity checks.