Selenomethionine

Selenomethionine
Names
	IUPAC name 2-Amino-4-(methylselanyl)butanoic acid
	Other names MSE
Identifiers
CAS Number	3211-76-5 (L) ; 1464-42-2 (D/L) ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:27585 ;
ChemSpider	14375 ;
ECHA InfoCard	100.014.525
PubChem CID	15103;
UNII	964MRK2PEL (L) ; J9V40V4PKZ (D/L) ;
CompTox Dashboard (EPA)	DTXSID7040609 ;
	InChI InChI=1S/C5H11NO2Se/c1-9-3-2-4(6)5(7)8/h4H,2-3,6H2,1H3,(H,7,8) Key: RJFAYQIBOAGBLC-UHFFFAOYSA-N ;
	SMILES C[Se]CCC(C(=O)O)N;
Properties
Chemical formula	C5H11NO2Se
Molar mass	196.106 g/mol
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Selenomethionine (SeMet) is a naturally occurring amino acid. The L-selenomethionine enantiomer is the main form of selenium found in Brazil nuts, cereal grains, soybeans, and grassland legumes, while Se-methylselenocysteine, or its γ-glutamyl derivative, is the major form of selenium found in Astragalus, Allium, and Brassica species. In vivo, selenomethionine is randomly incorporated instead of methionine. Selenomethionine is readily oxidized.

Selenomethionine's antioxidant activity arises from its ability to deplete reactive oxygen species. Selenium and methionine also play separate roles in the formation and recycling of glutathione, a key endogenous antioxidant in many organisms, including humans.