SerineThreonine
Serinethreonine is not a standard amino acid. In most biochemical contexts the two residues, serine (Ser) and threonine (Thr), are treated separately. The term serinethreonine is sometimes used informally to denote a dipeptide consisting of a serine residue linked to a threonine residue (Ser–Thr or Thr–Ser), or more generally to refer to adjacent serine and threonine residues within a protein. It is not a fixed chemical entity recognized as a single amino acid in biology.
Chemical and structural features: As a dipeptide, serinethreonine would present two polar side chains bearing hydroxyl
Occurrence and synthesis: In proteins, a Ser–Thr dipeptide occurs whenever serine and threonine residues appear consecutively.
Applications: In research, serinethreonine dipeptides are used as simple models to examine solvation, conformational dynamics, and
See also: serine, threonine, phosphoserine, phosphothreonine, dipeptides.