Abstract

We have recently shown that the monomeric subunit of mesodiaminopimelic acid containing bacterial peptidoglycans, i. e. the disaccharide tetrapeptide N-acetyl glucosaminyl-N-acetyl muramyl-L-alanyl-D-isoglutaminyl-meso-diaminopimelyl-D-alanine can replace whole killed mycobacteria in Freund's adjuvant. We now report further structural simplifications of the active molecule; natural N-acetyl-muramyl-tripeptides have been found active; the smallest adjuvant molecule found is a synthetic N-acetyl muramyl-dipeptide prepared by Sinaÿ et al. (1).

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