What Is 5-Amino-1MQ?
5-Amino-1MQ (5-amino-1-methylquinolinium) is a cell-permeable small-molecule inhibitor of NNMT (nicotinamide N-methyltransferase). Unlike most compounds in the research peptide space, 5-amino-1MQ is not a peptide — it is a quinolinium-based small molecule — but it is studied in the same metabolic and NAD+ biology contexts as research peptides such as NAD+ precursors, and it is frequently categorized alongside them in laboratory research applications.Phase 1 Peptides supplies 5-amino-1MQ as a research compound for laboratory use only.
NNMT Biology: The Target Enzyme
Nicotinamide N-methyltransferase (NNMT) is an enzyme expressed predominantly in adipose tissue and liver. Its catalytic function is to methylate nicotinamide — the amide form of vitamin B3 — using S-adenosyl methionine (SAM) as the methyl donor. The reaction produces 1-methylnicotinamide (MNA) and S-adenosyl homocysteine (SAH):> Nicotinamide + SAM → 1-Methylnicotinamide + SAH (catalyzed by NNMT)
This reaction sits at an intersection of three major metabolic pathways:
1. NAD+ precursor metabolism: Nicotinamide is a precursor for NAD+ via the salvage pathway (NAMPT-mediated). When NNMT methylates nicotinamide, it diverts it away from NAD+ synthesis. Higher NNMT activity = more nicotinamide routed to methylation = less available for NAD+ salvage.
2. One-carbon / methionine metabolism: SAM is the primary cellular methyl donor — used in DNA methylation, histone methylation, phospholipid synthesis, and neurotransmitter biosynthesis. NNMT activity depletes SAM and produces SAH, which is a feedback inhibitor of other methyltransferases (SAH is a competitive inhibitor of SAM-dependent enzymes). NNMT is therefore a significant consumer of the cellular methyl pool.
3. Adipose tissue epigenetics: Because NNMT expression is high in adipose tissue, its effects on the SAM/SAH ratio locally influence the methylation status of chromatin and gene expression in adipocytes and adipose stromal cells.
Mechanism of Action: NNMT Inhibition
5-Amino-1MQ inhibits NNMT competitively — occupying the nicotinamide-binding site of the enzyme without being methylated itself. By blocking NNMT:
- Nicotinamide availability for NAD+ salvage is preserved — more nicotinamide is available for NAMPT to convert to NMN and then to NAD+
- SAM is not consumed in NNMT-mediated methylation — intracellular SAM levels rise and SAH/SAM ratio improves
- The methyl donor pool is spared — methylation reactions that depend on SAM availability are less substrate-limited
This mechanism is structurally distinct from direct NAD+ precursor supplementation (NMN, NR). NAD+ precursors supply the substrate; 5-amino-1MQ blocks the enzyme that competes for that substrate. In research designs examining NAD+ availability, these represent complementary or alternative experimental tools for probing the same upstream constraint.
Published Research Context
Published rodent studies with NNMT inhibitors, including 5-amino-1MQ, have examined:
- Adipocyte differentiation models: NNMT expression rises during adipogenesis; inhibition has been studied for its effects on adipocyte maturation and lipid accumulation in cell culture systems
- Adipose tissue metabolism: In vivo studies in diet-induced obesity mouse models have examined metabolic parameters in response to NNMT inhibition, including energy expenditure endpoints and adipose depot changes
- Methionine metabolism: The intersection of NNMT activity with the one-carbon cycle has been studied in the context of methylation capacity and epigenetic regulation in metabolically active tissues
This body of literature positions 5-amino-1MQ as a research tool for probing NNMT's role in metabolic and epigenetic regulation — not a therapeutic compound. For the complementary perspective on NAD+ biology, see the NAD+ research primer, which covers the sirtuin and PARP pathways that depend on NAD+ availability.
Laboratory Handling Notes
5-Amino-1MQ is a water-soluble small molecule. It reconstitutes readily in sterile water or phosphate-buffered saline. Store lyophilized or powder form at −20 °C, protected from moisture. Reconstituted solutions are typically prepared fresh or stored at 2–8 °C for short-term use. Unlike peptides, 5-amino-1MQ does not require the same protease-protection handling considerations, but standard light and oxidation protection measures apply.
Product Availability
Phase 1 Peptides stocks 5-Amino-1MQ for laboratory research. Lot-specific third-party documentation is published where a certificate has been received; review the record for the applicable size and lot in the lab library.
Q: How does 5-amino-1MQ differ from NMN or NR as a research tool for NAD+ biology?NMN (nicotinamide mononucleotide) and NR (nicotinamide riboside) are direct NAD+ precursors — they supply substrate to the salvage pathway. 5-Amino-1MQ takes a different approach: it inhibits NNMT, the enzyme that competes with the salvage pathway for nicotinamide. The result is that more endogenous nicotinamide is available for NAD+ synthesis without adding exogenous substrate. Research designs can use these tools independently or together to probe different nodes of NAD+ regulation.
Q: Why is NNMT expression particularly high in adipose tissue?NNMT expression in adipose tissue is regulated by metabolic state and is substantially elevated in obesity models and during adipogenesis. Published research has proposed that high adipose NNMT activity suppresses the cellular methyl pool and restricts SAM availability, which has downstream effects on gene methylation in adipocytes. The elevated expression in adipose tissue is what has made adipose biology the primary research context for NNMT inhibitor studies.
Q: Is 5-amino-1MQ a peptide?No. 5-Amino-1MQ is a quinolinium-based small molecule, not a peptide. However, it is studied in the same NAD+ and metabolic research contexts as research peptides and is commonly included in research compound catalogs alongside peptide-based research tools. Phase 1 Peptides supplies it as a research compound for laboratory use only.
See Also
- Mitochondrial Research Peptides Overview — comparative overview of mitochondrial research compounds including 5-amino-1MQ
- NAD+ Cellular Energy Research — NAD+ biology and the NAMPT/SIRT1 axis that 5-amino-1MQ modulates
- MOTS-c Research Primer — mitochondria-encoded peptide that also acts on nuclear NAD+ metabolism
- SS-31 (Elamipretide) Research — cardiolipin-targeting mitochondrial peptide for bioenergetics research
- Peptide Half-Life Reference — pharmacokinetic data across mitochondrial research compounds
- Lab Testing & Verified Purity — batch quality documentation standards
- How to Reconstitute Research Peptides — laboratory reconstitution workflow
All Phase 1 Peptides products are supplied exclusively for laboratory research and in vitro studies. They are not intended for human or animal consumption, clinical use, or therapeutic application.