Category: amino-acid
Aliases: Ser, S, L-Serine
Phosphorylation site on proteins (serine/threonine kinases, the largest kinase family). One-carbon donor (via serine hydroxymethyltransferase → glycine + methylene-THF) for folate cycle. Phospholipid head group (phosphatidylserine). D-serine is an NMDA receptor co-agonist in the brain.