MOTS-c vs 5-Amino-1MQ
Research Comparison

Research Overview

MOTS-c and 5-Amino-1MQ are frequently cross-shopped because both are studied as metabolism-focused research tools in models of insulin resistance, obesity, and energy balance. They are, however, structurally and mechanistically unrelated and are not interchangeable. This page places them side by side so a study can select the appropriate compound for a given research question.

MOTS-c is a 16-amino-acid mitochondrial-derived peptide encoded within the mitochondrial 12S rRNA gene. In the reported literature it acts as a signaling peptide that engages the folate cycle and the AMP-activated protein kinase (AMPK) pathway, and it translocates to the nucleus under metabolic stress. 5-Amino-1MQ is a small-molecule, membrane-permeable inhibitor of nicotinamide N-methyltransferase (NNMT) built on a methylquinolinium scaffold, studied primarily in adipocyte and hepatic contexts.

All findings summarized here are in-vitro or preclinical (cell and rodent) and are described as reported research observations only. Exact salt form and net content for each catalog material should be confirmed against the batch COA. MOTS-c is commonly supplied as a trifluoroacetate or acetate salt, and 5-Amino-1MQ is commonly supplied as the iodide salt, so PubChem free-base and cation weights are not the vial fill weight.

Structure and Class

The two compounds occupy different chemical universes. MOTS-c is a peptide biologic: a 16-residue chain (Met-Arg-Trp-Gln-Glu-Met-Gly-Tyr-Ile-Phe-Tyr-Pro-Arg-Lys-Leu-Arg, sequence MRWQEMGYIFYPRKLR) with a reported free-base molecular formula of C101H152N28O22S2 and a molecular weight of approximately 2174.6 g/mol (PubChem CID 146675088, CAS 1627580-64-6). As a peptide it is supplied lyophilized and reconstituted before use.

5-Amino-1MQ (5-amino-1-methylquinolinium) is a small-molecule organic cation built on a methylquinolinium scaffold. The cation is C10H11N2+ with a molecular weight of approximately 159.21 g/mol (PubChem CID 950107, CAS 685079-15-6); the commonly supplied iodide salt is C10H11IN2 at approximately 286.11 g/mol (PubChem CID 66522933). The mass difference between the two compounds is roughly fourteen-fold, which reflects how different a signaling peptide and a small-molecule enzyme inhibitor are as physical entities.

Note that catalog material differs from the PubChem reference forms. MOTS-c is commonly a trifluoroacetate or acetate salt and 5-Amino-1MQ is commonly the iodide salt, so the exact salt, counterion, and net compound mass per vial should be confirmed against the batch COA rather than assumed from the free-base or cation weight.

Research Context

MOTS-c mechanism, as reported: in the seminal report (Lee et al., Cell Metab 2015, PMID 25738459), MOTS-c was shown in cell and mouse models to act primarily on skeletal muscle, inhibiting the folate cycle and its tethered de novo purine biosynthesis. The resulting accumulation of the intermediate AICAR is reported to activate AMPK. A second study (Kim et al., Cell Metab 2018, PMID 29983246) reported that under metabolic stress such as glucose restriction, MOTS-c translocates to the nucleus in an AMPK-dependent manner and modulates antioxidant-response-element genes, interacting with stress-responsive transcription factors including NRF2/NFE2L2, framing MOTS-c as a mediator of mitonuclear communication. Reviews (Wan et al., J Transl Med 2023, PMID 36670507; Zheng et al., Front Endocrinol 2023, PMID 36761202) summarize the Folate-AICAR-AMPK axis.

5-Amino-1MQ mechanism, as reported: in the foundational study (Neelakantan et al., Biochem Pharmacol 2018, PMID 29155147), methylquinolinium analogues with a primary amine substitution showed high membrane permeability and high selectivity, reportedly not inhibiting related SAM-dependent methyltransferases or NAD salvage enzymes. In cultured adipocytes, NNMT inhibition reduced the reaction product 1-methylnicotinamide and was reported to increase intracellular NAD+ and S-adenosylmethionine while suppressing lipogenesis.

The mechanistic contrast is sharp. MOTS-c is a signaling peptide that reportedly switches ON an energy-sensing kinase cascade (AMPK) and a nuclear stress-response program. 5-Amino-1MQ is an enzyme inhibitor that switches OFF a methyl-consuming enzyme (NNMT), thereby reportedly preserving the SAM and NAD+ methyl-donor pool in fat cells. On the research-stage axis, MOTS-c has advanced to a registered Phase 2a human study (NCT07505745, recruiting, no results reported), whereas the 5-Amino-1MQ evidence retrieved this run is entirely preclinical (mouse and cell).

Which Should a Study Use?

Selection follows the research question, not a ranking. A study centered on skeletal-muscle energy sensing, AMPK activation, folate/purine metabolism, or mitonuclear stress signaling would look to MOTS-c, the mitochondrial-derived signaling peptide. A study centered on NNMT enzymology, the SAM methyl-donor economy, NAD+ salvage in adipose tissue, or lipogenesis in fat cells would look to 5-Amino-1MQ, the small-molecule NNMT inhibitor.

Practical handling also distinguishes them. MOTS-c is a lyophilized peptide requiring reconstitution and cold-chain storage, with limited reconstituted-solution stability. 5-Amino-1MQ is a crystalline small-molecule solid that is comparatively robust and stored dry. Studies with limited cold-chain capacity may find the small molecule easier to handle, while peptide-signaling questions require MOTS-c regardless of format.

The shared metabolism framing is why these two are cross-shopped, but they are not interchangeable and act by unrelated mechanisms. Any decision should be grounded in the specific pathway under investigation and confirmed against the batch COA for the exact material on hand. All statements here describe reported preclinical and in-vitro research context only.