Serine
Serine — A non-essential amino acid (Ser, S) with a hydroxyl side chain, frequently serving as a phosphorylation site in signaling pathways.
What Is Serine?
Serine (Ser, S) is a polar amino acid with a hydroxyl (-OH) side chain (MW: 105.09 Da). It is the nucleophilic residue in serine proteases (trypsin, chymotrypsin), the site of O-linked glycosylation, and a phosphorylation target for Ser/Thr kinases. Serine at position 3 of ghrelin is the site of the essential octanoyl modification.
Roles in Peptide Research
- Serine proteases: The Ser-His-Asp catalytic triad is the active site mechanism for the largest protease family
- Phosphorylation: Ser phosphorylation by PKA, PKC, and Akt is measured by phospho-specific antibodies in Western blots
- Pseudoprolines: Ser-derived pseudoproline dipeptides are used in SPPS to disrupt on-resin aggregation during difficult syntheses
Frequently Asked Questions
What is Serine?
A non-essential amino acid (Ser, S) with a hydroxyl side chain, frequently serving as a phosphorylation site in signaling pathways.
Why is Serine important in peptide research?
Serine is a fundamental concept in amino acid as it relates to peptide science. It directly influences experimental design, compound characterization, and the reliability of research outcomes across biochemistry and molecular biology disciplines.