#AminoAcidAdvent
#AminoAcidAdvent Day 2: Serine (Ser; S)

Is one of 6 where the first letter is unique, and one of two with hydroxyl side chains... so it is polar. Some people love it as one of the phospho musketeers.

I didn't know it was first described in silk protein:
babel.hathitrust.org/cgi/pt?id=hv...
December 5, 2025 at 12:45 PM
#AminoAcidAdvent Day 1: Proline

The kinkiest of amino acids (NSFW!), synthesized from glutamic acid, and some even call it the simplest "enzyme". Regardless, its a pro move to include the hydroxyproline variable mod if your abundant proteins have collagen domains... really, do this.
December 4, 2025 at 12:50 PM