5-Amino-1MQ is not a peptide — it is a small-molecule NNMT inhibitor, a single quinolinium cation with no amino-acid backbone, so the “5 amino 1mq peptide” label is a common misnomer.
The word “amino” in the name points to a single amino substituent on a ring, not to amino acids, which is where the confusion starts. This explainer separates small-molecule enzyme inhibitors from peptides so the right handling and assays are chosen.
Why is 5-Amino-1MQ called a peptide so often?
It is sold alongside research peptides and the name begins with “5-amino,” which reads like amino-acid chemistry. But a peptide is a polymer of amino acids linked by peptide (amide) bonds. 5-Amino-1MQ has neither a chain of residues nor peptide bonds: it is 5-amino-1-methylquinolinium, one aromatic heterocyclic cation. The parallel with other “is it a peptide?” cases is covered in why NAD+ is not a peptide.
What class of molecule is it?
It is a small-molecule organic cation of the methylquinolinium family. The cation formula is C10H11N2+ (159.21 g/mol); it is supplied as the iodide salt (C10H11IN2, 286.11 g/mol, CAS 42464-96-0). For a side-by-side of the three broad categories researchers encounter, see peptide vs protein vs small molecule.
Peptide vs small-molecule inhibitor: what actually differs?
| Feature | Peptide | 5-Amino-1MQ (small molecule) |
|---|---|---|
| Building blocks | Amino acids | Single quinolinium ring system |
| Bond type | Peptide (amide) bonds | No peptide bonds |
| Typical mass | Hundreds to thousands g/mol | 159.21 g/mol (cation) |
| Charge | Depends on sequence/pH | Permanent cation |
| Identity check | Sequence by MS/Edman | Formula/mass by MS, purity by HPLC |
Why does the distinction matter in the lab?
Classification drives solvent choice, stock-concentration math, and storage. A small cationic salt dissolves and behaves differently from a lyophilized peptide, so the solubility and storage guide handles it as a small-molecule salt. The full chemistry sits in the 5-Amino-1MQ research profile, and the compound itself is the 5-Amino-1MQ research listing.
Related research guides
- 5-Amino-1MQ: NNMT-Inhibitor Chemistry and In-Vitro Research Profile
- 5-Amino-1-Methylquinolinium: Chemistry, Naming and Spelling Variants
- Peptide vs. Protein vs. Small Molecule
Research-use note
All materials discussed are supplied for in vitro laboratory research use only, and are not for human or animal use.
