Cysteine is a major biological source of sulfur and is one of the two common sulfur-containing amino acids. The biosynthesis of cysteine occurs through the initial condensation of homocysteine and serine via cystathionine synthase to form cystathionine, which in turn undergoes cleavage by cystathionase to give The cyst of the cysteine residues in proteins is an important part of the stabilization of the three -dimensional structure of proteins. An investigation into cysteine and cystine levels in normal and malignant cells with a relationship to g-cystathionase levels and tumor sensitivity to L-cysteine and cystine depletion has been reported. The toxicity of human neuronal cell lines to cysteine and its metabolites has been investigated. Cysteine can inhibit the activity of enzymes such as lecithin-cholesterol acyltransferase.
|Storage Condition||Room Temperature|