NAD+ (Nicotinamide Adenine Dinucleotide)

NAD+ (Nicotinamide Adenine Dinucleotide)

NAD+ (Nicotinamide Adenine Dinucleotide)

NAD+ (Nicotinamide Adenine Dinucleotide)

NAD+ (Nicotinamide Adenine Dinucleotide / β-NAD+) is an indispensable pyridine nucleotide coenzyme and master metabolic regulator of cellular redox state. Operating as a critical electron acceptor in glycolysis and the Krebs cycle, NAD+ transfers hydrides to mitochondrial Complex I while serving as an obligate, consumable substrate for sirtuin deacetylases (SIRT1–7), PARP DNA-repair enzymes, and CD38 cyclase signaling cascades.

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What is NAD+ (Nicotinamide Adenine Dinucleotide)?

NAD+ (known chemically as Nicotinamide Adenine Dinucleotide, β-NAD+, or DPN) is a fundamental dinucleotide coenzyme found in all cells. Structurally composed of two mononucleotides joined through their phosphate groups—one containing an adenine nucleobase and the other a nicotinamide ring—NAD+ functions as a vital central node connecting cellular bioenergetics with genomic stability and epigenetic signaling.

Operating across two primary cellular modalities, NAD+ acts reversibly as an electron carrier (cycling between oxidized NAD+ and reduced NADH) to power mitochondrial oxidative phosphorylation and ATP generation. Concurrently, it functions as an essential, non-renewable co-substrate for regulatory enzymes, including class III histone deacetylases (Sirtuins, SIRT1–7), poly(ADP-ribose) polymerases (PARPs), and cyclic ADP-ribose synthases (CD38/CD157).

Batch-verified for high analytical purity at Modern Aminos, NAD+ (Nicotinamide Adenine Dinucleotide) is supplied in 2 standards:

  • 500 MG lyophilized reference standard in a 2R glass vial
  • 4000 MG (200 mg/mL) aqueous reference standard in a 20R glass vial

Researchers investigating mitochondrial respiratory capacity, sirtuin activation kinetics, and DNA repair mechanics evaluate NAD+ alongside complementary metabolic and redox reference standards available on the site, such as NMN, NR (Nicotinamide Riboside), S-Acetyl-L-Glutathione, CoQ10, and Methylene Blue.

Chemical and Molecular Data

Compound Name NAD+ (Nicotinamide Adenine Dinucleotide / β-NAD+)
Quantity / Formats Offered High-Purity Lyophilized Dry Powder / Solid Unit Material
Chemical Structure Pyridine-Adenine Dinucleotide Pyrophosphate
Synonyms / Alt Names β-NAD+, DPN, Coenzyme I, Nadide, Diphosphopyridine nucleotide, Oxidized NAD
CAS Number 53-84-9 (Free Acid) | 20111-18-6 (Sodium Salt)
Chemical Formula C21H27N7O14P2 (Free Acid)
Molecular Weight 663.43 g/mol (Free Acid) | 685.41 g/mol (Sodium Salt)
IUPAC Name [[5-(6-aminopurin-9-yl)-3,4-dihydroxyoxolan-2-yl]methoxy-hydroxyphosphoryl] [5-(3-carbamoylpyridin-1-ium-1-yl)-3,4-dihydroxyoxolan-2-yl]methyl phosphate
InChIKey InChIKey=BAWFJGJZGIEFAR-NNYOXOHSSA-N
SMILES Code C1=CC(=C[N+](=C1)[C@H]2[C@@H]([C@@H]([C@H](O2)COP(=O)(O)OP(=O)(O)OC[C@@H]3[C@H]([C@@H]([C@@H](O3)N4C=NC5=C(N=CN=C54)N)O)O)O)O)C(=O)N

What are the Mechanisms of Action?

The biochemical pathways and cellular targets of NAD+ in laboratory research include:

  • Mitochondrial Redox Cycling & ATP Synthesis: NAD+ serves as a hydride acceptor in glycolysis, pyruvate decarboxylation, fatty acid β-oxidation, and the Krebs cycle, forming NADH. NADH delivers high-energy electrons to Complex I (NADH:ubiquinone oxidoreductase) of the electron transport chain, generating the inner mitochondrial membrane proton gradient (ΔΨm) required for ATP synthase activity.
  • Sirtuin Deacetylase Activation (SIRT1–SIRT7): NAD+ (Nicotinamide Adenine Dinucleotide) is an obligate co-substrate for the sirtuin family of NAD+-dependent protein deacetylases. By cleaving acetyl groups from target proteins (such as PGC-1α, FOXO1, and NF-κB) and converting NAD+ to nicotinamide and 2′-O-acetyl-ADP-ribose, sirtuins upregulate mitochondrial biogenesis, oxidative stress defense, and metabolic adaptation.
  • PARP-Mediated Genomic DNA Repair: Under genotoxic stress, poly(ADP-ribose) polymerases (primarily PARP1 and PARP2) consume NAD+ to synthesize poly(ADP-ribose) (PAR) chains on histones and DNA repair factors. This post-translational modification recruits base-excision and single-strand break repair complexes to maintain chromatin integrity.

What do Preclinical & Academic Studies Show for NAD+?

When evaluating research efficacy and published scientific literature for NAD+ (Nicotinamide Adenine Dinucleotide):

  • Intermediary Metabolism & Sirtuin Kinetics (PubMed): Comprehensive biochemical reviews cataloged on PubMed (PMID: 29432159) detail how maintaining intracellular NAD+ pools prevents mitochondrial decline, enhances insulin signaling pathways, and sustains metabolic flexibility in cellular senescence models.
  • PARP Activation & Cellular Longevity Mechanisms (PMC): Peer-reviewed monographs archived in PMC (PMC7963035) document the competition between sirtuins and PARP1 for intracellular NAD+ pools during acute oxidative stress and age-related NAD+ depletion.
  • Chemical Profiling & Identification (PubChem): Official structural characterization maintained on PubChem verifies the 663.43 g/mol molecular mass, pyridine-adenine dinucleotide geometry, and HPLC mass spectrometry profile of CAS 53-84-9.

How does NAD+ (Nicotinamide Adenine Dinucleotide) compare to other compounds?

To evaluate cellular uptake pathways, enzymatic conversion steps, and bioenergetic targets, researchers compare NAD+ against alternative reference standards available at Modern Aminos:

Direct NAD+ vs. Biosynthetic Precursors (NMN and NR)

In cellular bioenergetics and longevity research, molecular size dictates cellular transport and metabolic conversion pathways:

  • Direct NAD+ (Nicotinamide Adenine Dinucleotide): The complete, biologically active coenzyme dinucleotide. Directly fuels extracellular CD38/CD73 degradation pathways, purinergic signaling, and cell-free enzymatic assays without requiring upstream intracellular synthesis enzymes (NAMPT or NMNAT).
  • NMN (Nicotinamide Mononucleotide): Direct single-step precursor to NAD+. Translocates across plasma membranes via specialized transporters (e.g., Slc12a8) or extracellular dephosphorylation to NR, where intracellular NMNAT enzymes conjugate it with ATP to synthesize NAD+.
  • NR (Nicotinamide Riboside): Smaller nucleoside precursor lacking phosphate groups. Readily enters cells via equilibrative nucleoside transporters (ENTs) and is converted to NMN by nicotinamide riboside kinases (NRK1/2) before final adenylation to NAD+.
Compound / Reference Chemical Structure & Class Core Mechanism of Action Research Focus & Profile
NAD+ Pyridine-Adenine Dinucleotide Coenzyme Primary redox electron carrier (Complex I) and obligate substrate for Sirtuins, PARPs, and CD38 Focuses on baseline bioenergetics, sirtuin deacetylation kinetics, PARP DNA repair, and mitochondrial respiration
NMN (Nicotinamide Mononucleotide) Ribonucleotide Pyridine Precursor Direct substrate for NMNAT1–3 enzymes; undergoes adenylation with ATP to form intracellular NAD+ Focuses on single-step NAD+ biosynthesis, Slc12a8 transport kinetics, and age-related NAD+ salvage pathways
NR (Nicotinamide Riboside) Ribosyl Pyridine Nucleoside Precursor Phosphorylated by NRK1/2 to generate NMN, which is subsequently converted into intracellular NAD+ Focuses on equilibrative nucleoside transport, NRK pathway kinetics, and mitochondrial biogenesis signaling
S-Acetyl-L-Glutathione (SAG) Lipophilic S-Acetylated Tripeptide Thioester Cell-permeable GSH precursor; cleaved by intracellular esterases to directly restore reduced glutathione pools Focuses on lipid-phase antioxidant defense, direct ROS scavenging, and GPx/GST enzymatic detoxification pathways

Frequently Asked Questions (FAQs)

1. Is Modern Aminos a reliable place to buy NAD+ (Nicotinamide Adenine Dinucleotide)?

Yes, Modern Aminos is a highly trusted vendor for high-purity research chemicals and reference coenzymes. Every batch undergoes strict third-party analytical testing (including HPLC and Mass Spectrometry) to verify minimum 98%+ chemical purity, correct molecular weight (663.43 g/mol), exact dinucleotide structure fidelity, and complete absence of heavy metals or synthesis impurities.

2. What is NAD+ (Nicotinamide Adenine Dinucleotide) and how is it classified chemically?

NAD+ (Nicotinamide Adenine Dinucleotide) is an essential, endogenous pyridine nucleotide coenzyme. It consists of an adenine base and a nicotinamide ring linked via two phosphate groups, functioning as a master redox cofactor and enzymatic substrate in cellular metabolism.

3. What role does NAD+ play in cellular redox reactions and mitochondrial ATP generation?

NAD+ (Nicotinamide Adenine Dinucleotide) acts as a hydride acceptor in glycolysis, beta-oxidation, and the Krebs cycle to form NADH. NADH transfers electrons directly to Complex I of the mitochondrial respiratory chain, driving the proton gradient required for ATP synthesis.

4. How does NAD+ interact with Sirtuin (SIRT1–SIRT7) enzymes?

Sirtuins require NAD+ as an obligate co-substrate to remove acetyl groups from histones and transcriptional regulators like PGC-1α. During deacetylation, NAD+ is consumed and cleaved into nicotinamide and 2′-O-acetyl-ADP-ribose.

5. How does direct NAD+ differ from biosynthetic precursors like NMN and NR?

NAD+ is the fully formed coenzyme dinucleotide. NMN (a mononucleotide) and NR (a nucleoside) are smaller precursor molecules that require intracellular enzymatic conversion via NMNAT or NRK pathways to synthesize functional NAD+.

6. What is the relationship between NAD+ and PARP-mediated DNA repair?

PARP enzymes consume NAD+ to synthesize poly(ADP-ribose) polymers on damaged chromatin sites. This process signals and recruits base-excision repair machinery, making NAD+ availability a critical rate-limiting factor during genotoxic stress.

7. How does Modern Aminos verify the chemical purity and mass identity of NAD+?

Modern Aminos utilizes High-Performance Liquid Chromatography (HPLC) to confirm active purity exceeding 98% and Mass Spectrometry (MS) to verify exact molecular weight (663.43 g/mol) and dinucleotide structural identity prior to batch release.

8. What are the recommended storage parameters for lyophilized NAD+ glass vials?

Lyophilized NAD+ reference material should be stored tightly sealed in a cool, dry environment (15°C to 25°C) or refrigerated for long-term preservation. Protect from direct heat, light exposure, and atmospheric moisture to maintain solid-state dinucleotide stability.

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