cysteiny
Cysteiny is a term that appears in some contexts to refer to compounds or moieties derived from the amino acid cysteine, or to the cysteinyl fragment in peptides. It is not a standard, standalone chemical name with a single, universal definition. In peptide and protein chemistry, the prefix cysteinyl- or adjective cysteinyl describes a cysteine residue or a cysteine-derived linkage within a molecule. For example, cysteinylglycine is a dipeptide consisting of cysteine linked to glycine, and the cysteinyl moiety is present in the tripeptide glutathione (gamma-glutamylcysteinylglycine), a key intracellular antioxidant.
Cysteine itself is a sulfur-containing amino acid with a thiol side chain (–CH2–SH). The thiol group allows
In summary, cysteiny is not a widely standardized term; its meaning is context-dependent and typically relates