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S-(5′-Adenosyl)-L-methionine chloride dihydrochloride


AdoMet, SAM chloride dihydrochloride, Active methionine
Empirical Formula (Hill Notation):
C15H23ClN6O5S · 2 HCl
CAS Number:
Molecular Weight:
MDL number:
PubChem Substance ID:

Quality Level






cell analysis: suitable


white to off-white


H2O: 100 mg/mL

shipped in

dry ice

storage temp.


SMILES string




InChI key


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General description

S-(5′-Adenosyl)-L-methionine chloride dihydrochloride (SAM) facilitates the transfer of methyl groups to proteins, lipids and nucleic acids. Methionine adenosyl transferase catalyses the synthesis of SAM from methionine and adenosine triphosphate (ATP). SAM functions to regulate various cellular functions like cell division, cell death, transcription, genetic stability, oxidant/antioxidant balance and polyamine homeostasis. Therapeutically, SAM finds its application as a nutritional supplement in humans for various diseases like osteoarthritis and liver injury. SAM also regulates transsulfuration reactions by binding to the regulatory domain of key enzyme cystathionine-β-synthase (CBS).


S-(5′-Adenosyl)-L-methionine chloride dihydrochloride has been used as a medium supplement for S30 cell extract. It also has been used for measuring the interaction with catechol-O-methyltransferase (COMT) by quartz crystal microbalance (QCM), surface plasmon resonance (SPR) and isothermal titration calorimetry (ITC) with supported lipid bilayers and vesicles.


5 mg in glass bottle
25, 100, 500 mg in poly bottle
1 g in poly bottle

Biochem/physiol Actions

Methyl donor; cofactor for enzyme-catalyzed methylations, including catechol O-methyltransferase (COMT) and DNA methyltransferases (DNMT). Although present in all cells, it is concentrated in liver where 85% of all methylation reactions occur. It is also involved in regulating liver function, growth, and response to injury.


This material is 80-90% pure when prepared, but is very unstable. As much as 10% purity loss per day at 25 °C has been noted.

Analysis Note

Purity based on UV and HPLC.

Storage Class Code

13 - Non Combustible Solids

WGK Germany


Flash Point F

Not applicable

Flash Point C

Not applicable

Certificate of Analysis

Certificate of Origin

Ted M Lakowski et al.
Analytical biochemistry, 396(1), 158-160 (2009-09-08)
S-Adenosyl-L-homocysteine (AdoHcy) background signal in reactions with protein arginine N-methyltransferase 1 is investigated using an ultrahigh-performance liquid chromatography tandem mass spectrometry assay that measures AdoHcy. We identify three sources of AdoHcy background: enzymatic automethylation, AdoHcy contamination in commercial S-adenosyl-L-methionine (AdoMet)...
S-Adenosylmethionine Rescues Cognitive Deficits in the rTg4510 Animal Model by Stabilizing Protein Phosphatase 2A and Reducing Phosphorylated Tau.
Beauchamp, et al.
Journal of Alzheimer'S Disease, 77, 1705-1715 (2021)
Yan Zhang et al.
Archives of microbiology, 191(10), 773-783 (2009-09-05)
Enolase-phosphatase (E1), as an enzyme, is involved in methionine salvage pathway in many prokaryotic and eukaryotic organisms. But the identity and function of E1 in Xanthomonas oryzae pv. oryzae (Xoo) remain undetermined. Here, we report the cloning and characterization of...
Katalin Módis et al.
Nitric oxide : biology and chemistry, 41, 146-156 (2014-03-29)
Recent data show that colon cancer cells selectively overexpress cystathionine-β-synthase (CBS), which produces hydrogen sulfide (H2S), to maintain cellular bioenergetics, support tumor growth and stimulate angiogenesis and vasorelaxation in the tumor microenvironment. The purpose of the current study was to...
Andria V Rodrigues et al.
Chembiochem : a European journal of chemical biology, 21(5), 663-671 (2019-09-13)
We recently reported the discovery of phenylacetate decarboxylase (PhdB), representing one of only ten glycyl-radical-enzyme reaction types known, and a promising biotechnological tool for first-time biochemical synthesis of toluene from renewable resources. Here, we used experimental and computational data to...

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