Common NameL,l-cystathionine
DescriptionCystathionine is a dipeptide formed by serine and homocysteine. Cystathioninuria is a prominent manifestation of vitamin-B6 deficiency. The transsulfuration of methionine yields homocysteine, which combines with serine to form cystathionine, the proximate precursor of cysteine through the enzymatic activity of cystathionase. In conditions in which cystathionine gamma-synthase or cystathionase is deficient, for example, there is cystathioninuria. Although cystathionine has not been detected in normal human serum or plasma by most conventional methods, gas chromatographic/mass spectrometric methodology detected a mean concentration of cystathionine in normal human serum of 140 nM, with a range of 65 to 301 nM. Cystathionine concentrations in CSF have been 10, 1, and 0.5 uM, and "not detected". Only traces (i.e., <1 uM) of cystathionine are present in normal CSF.587. Gamma-cystathionase deficiency (also known as Cystathioninuria), which is an autosomal recessive disorder (NIH: 2428), provided the first instance in which, in a human, the major biochemical abnormality due to a defined enzyme defect was clearly shown to be alleviated by administration of large doses of pyridoxine. The response in gamma-cystathionase-deficient patients is not attributable to correction of a preexisting deficiency of this vitamin (OMMBID, Chap. 88).
Structure
Molecular FormulaC7H14N2O4S
Average Mass222.26200
Monoisotopic Mass222.06743
IUPAC Name(2S)-2-amino-4-{[(2R)-2-amino-2-carboxyethyl]sulfanyl}butanoic acid
Traditional NameL-(+)-cystathionine
CAS Registry Number56-88-2
SMILES[NH3+][C@@H](CCSC[C@H]([NH3+])C(=O)[O-])C(=O)[O-]
InChI IdentifierInChI=1S/C7H14N2O4S/c8-4(6(10)11)1-2-14-3-5(9)7(12)13/h4-5H,1-3,8-9H2,(H,10,11)(H,12,13)/t4-,5-/m0/s1
InChI KeyILRYLPWNYFXEMH-WHFBIAKZSA-N
CHEBI IDCHEBI:58161
HMDB IDHMDB0000099
Pathways
NameSMPDB/PathBank
Glycine, serine and threonine metabolism
Methionine Metabolism
Cystathionine Beta-Synthase Deficiency
Dihydropyrimidine Dehydrogenase Deficiency (DHPD)
S-Adenosylhomocysteine (SAH) Hydrolase Deficiency
Methionine Adenosyltransferase Deficiency
Glycine N-methyltransferase Deficiency
Non Ketotic Hyperglycinemia
Dimethylglycine Dehydrogenase Deficiency
Sarcosinemia
Methylenetetrahydrofolate Reductase Deficiency (MTHFRD)
Hypermethioninemia
Homocysteine Degradation
Dimethylglycine Dehydrogenase Deficiency
Hyperglycinemia, non-ketotic
Gamma-cystathionase deficiency (CTH)
Homocystinuria, cystathionine beta-synthase deficiency
Homocystinuria-megaloblastic anemia due to defect in cobalamin metabolism, cblG complementation type
3-Phosphoglycerate dehydrogenase deficiency
StateSolid
Water Solubility1.73e+01 g/l
logP-4.01
logS-1.11
pKa (Strongest Acidic)1.79
pKa (Strongest Basic)9.66
Hydrogen Acceptor Count6
Hydrogen Donor Count4
Polar Surface Area126.64 Ų
Rotatable Bond Count7
Physiological Charge0
Formal Charge0
Refractivity51.57 m³·mol⁻¹
Polarizability22.02

We require the use of cookies for essential features like storing your previously submitted BASys2 queries. Rejecting the usage of cookies will result in certain features being disabled. By clicking ACCEPT or continuing to use the website you are agreeing to our use of cookies.

ACCEPT