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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



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)...
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...
Chemical communication between bacteria and cell-free gene expression systems within linear chains of emulsion droplets
Schwarz-Schilling M, et al.
Integrative Biology : Quantitative Biosciences from Nano to Macro, 8(4), 564-570 (2016)
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...
Yaping Wang et al.
Plant physiology and biochemistry : PPB, 149, 121-131 (2020-02-18)
Flower senescence is classified into ethylene-dependent and ethylene-independent manners and determines the flower longevity which is valuable for ornamental plants. However, the manner of petal senescence in tulip is still less defined. In this study, we characterized the physiological indexes...

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