L-Cysteine is a natural proteinogenic amino acid featuring a thiol-containing side chain (-CH2-SH) attached to the α-carbon, along with an amino group and a carboxyl group characteristic of amino acids. It is present as the L stereoisomer, and the cysteine thiol can undergo reversible oxidation to disulfides or participate in nucleophilic reactions, while the α-amino and α-carboxyl groups enable zwitterionic behavior in aqueous media. L-Cysteine is used in peptide and protein chemistry as a building block for introducing sulfur-containing functionality, and it serves as a chemically defined reagent for studies requiring thiol/disulfide redox handling, conjugation handle availability, or analytical derivatization of cysteine residues.
CAT No: CP00601
CAS No:52-90-4
Synonyms/Alias:L-cysteine;cysteine;52-90-4;Half-cystine;(R)-Cysteine;Thioserine;Cystein;(R)-2-Amino-3-mercaptopropanoicacid;L-(+)-Cysteine;beta-Mercaptoalanine;L-Cystein;Cysteine,L-;2-Amino-3-mercaptopropionicacid;L-Cys;Halfcystine;(2R)-2-amino-3-sulfanylpropanoicacid;FREECYSTEINE;LCysteine;L-Alanine,3-mercapto-;cisteina;Polycysteine;Cisteinum;Cysteinum;b-Mercaptoalanine;L-Zystein
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