Record Information
Version 1.0
Update Date 1/22/2018 11:54:54 AM
Metabolite IDPAMDB001427
Identification
Name: Se-Methylselenocysteine
Description:Se-Methylselenocysteine (SeMSC) is a naturally occurring seleno-amino acid that is synthesized by plants such as garlic, astragalus, onions and broccoli. SeMSC is an intermediate in selenoamino acid metabolism. Unlike selenomethionine, which is incorporated into proteins in place of methionine, SeMSC is not incorporated into any proteins, thereby being fully available for the synthesis of selenium-containing enzymes such as glutathione peroxidase.
Structure
Thumb
Synonyms:
  • 3-(Methylseleno)-L-Alanine
  • Methylselenocysteine
  • Se-Methyl-L-selenocysteine
  • Selenium-methylselenocystine
Chemical Formula: C4H9NO2Se
Average Molecular Weight: 182.08
Monoisotopic Molecular Weight: 182.979850365
InChI Key: XDSSPSLGNGIIHP-VKHMYHEASA-N
InChI:InChI=1S/C4H9NO2Se/c1-8-2-3(5)4(6)7/h3H,2,5H2,1H3,(H,6,7)/t3-/m0/s1
CAS number: 26046-90-2
IUPAC Name:(2R)-2-amino-3-(methylselanyl)propanoic acid
Traditional IUPAC Name: methylselenocysteine
SMILES:C[Se]C[C@H](N)C(O)=O
Chemical Taxonomy
Taxonomy DescriptionThis compound belongs to the class of organic compounds known as d-alpha-amino acids. These are alpha amino acids which have the D-configuration of the alpha-carbon atom.
Kingdom Organic compounds
Super ClassOrganic acids and derivatives
Class Carboxylic acids and derivatives
Sub ClassAmino acids, peptides, and analogues
Direct Parent D-alpha-amino acids
Alternative Parents
Substituents
  • D-alpha-amino acid
  • Selenoether
  • Monocarboxylic acid or derivatives
  • Carboxylic acid
  • Hydrocarbon derivative
  • Primary amine
  • Organoselenium compound
  • Organooxygen compound
  • Organonitrogen compound
  • Primary aliphatic amine
  • Carbonyl group
  • Amine
  • Aliphatic acyclic compound
Molecular Framework Aliphatic acyclic compounds
External Descriptors
Physical Properties
State: Solid
Charge:0
Melting point: Not Available
Experimental Properties:
PropertyValueSource
Predicted Properties
PropertyValueSource
Water Solubility156.0 mg/mLALOGPS
logP-2.8ALOGPS
logP-3.5ChemAxon
logS-0.07ALOGPS
pKa (Strongest Acidic)1.46ChemAxon
pKa (Strongest Basic)8.4ChemAxon
Physiological Charge0ChemAxon
Hydrogen Acceptor Count3ChemAxon
Hydrogen Donor Count2ChemAxon
Polar Surface Area63.32 Å2ChemAxon
Rotatable Bond Count3ChemAxon
Refractivity38.2 m3·mol-1ChemAxon
Polarizability12.89 Å3ChemAxon
Number of Rings0ChemAxon
Bioavailability1ChemAxon
Rule of FiveYesChemAxon
Ghose FilterYesChemAxon
Veber's RuleYesChemAxon
MDDR-like RuleYesChemAxon
Biological Properties
Cellular Locations: Cytoplasm
Reactions:
Pathways:
Spectra
Spectra:
Spectrum TypeDescriptionSplash Key
GC-MSGC-MS Spectrum - GC-MS (1 TMS)splash10-000i-2900000000-584579d62a5c494d1ad4View in MoNA
GC-MSGC-MS Spectrum - GC-MS (2 TMS)splash10-0i00-1960000000-c1d9d3d6c03ef447c682View in MoNA
GC-MSGC-MS Spectrum - GC-MSNot Available
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 10V, Positivesplash10-001r-0900000000-87ae6338ccd9513f5db0View in MoNA
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 20V, Positivesplash10-001r-1900000000-204e0c71178a372a67d0View in MoNA
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 40V, Positivesplash10-000f-9800000000-f08ef5fe840b11c1330bView in MoNA
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 10V, Negativesplash10-00lu-5900000000-267cb39ae0470e212ce2View in MoNA
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 20V, Negativesplash10-0079-9400000000-7ae0b50471ba90d5656cView in MoNA
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 40V, Negativesplash10-0006-9300000000-7580c3589d69535a4bb7View in MoNA
References
References:
  • Kanehisa, M., Goto, S., Sato, Y., Furumichi, M., Tanabe, M. (2012). "KEGG for integration and interpretation of large-scale molecular data sets." Nucleic Acids Res 40:D109-D114. Pubmed: 22080510
  • Yin MB, Li ZR, Cao S, Durrani FA, Azrak RG, Frank C, Rustum YM: Enhanced 7-ethyl-10-hydroxycamptothecin (SN-38) lethality by methylselenocysteine is associated with Chk2 phosphorylation at threonine-68 and down-regulation of Cdc6 expression. Mol Pharmacol. 2004 Jul;66(1):153-60. Pubmed: 15213307
Synthesis Reference: Spallholz, Julian E.; Reid, Ted W.; Walkup, Robert D. A method of using synthetic L-Se-methylselenocysteine as a nutriceutical. Eur. Pat. Appl. (2002), 21 pp.
Material Safety Data Sheet (MSDS) Download (PDF)
External Links:
ResourceLink
CHEBI ID27812
HMDB IDHMDB04113
Pubchem Compound ID147004
Kegg IDC05689
ChemSpider ID129633
Wikipedia IDNot Available
BioCyc IDNot Available