[mallomarmeasle]

Yes. Some bacteria have D-amino acids (such as D-alanine) as part of their cell walls (which otherwise contain almost entirely L-amino acids). D-amino acids are also sometimes incorporated into drugs that are synthetic peptide mimics in order to slow metabolism.

[ethbr1]

> D-amino acids are also sometimes incorporated into drugs that are synthetic peptide mimics in order to slow metabolism.

Thanks! I think that was the notecard in a dusty corner of my mind that was nagging.

[throwawaymaths]

d-ala is not incorporated into the protein main sequence (it's part of a D-ala D-lac sugar)