Pseudopeptidoglycan
The Pseudopeptidoglycan or pseudomurein is a substance that occurs as a cell wall in archaea. Is a polysaccharide, bound to the short amino acid chains.
It is very similar to the murein and consists of a chain of alternating N-acetylglucosamine and N- Acetyltalosaminuronsäure units which are β -1 ,3- glycosidically linked. The N- Acetyltalosaminuronsäure ( TalNAc ) replaced in Pseudopeptidoglycan the N- acetylmuramic acid of peptidoglycan.
The individual Pseudopeptidoglycan strands are cross-linked by peptides. A respective TalNAc is connected across the peptide chain is Glu -Ala- Lys-Glu- Lys -Ala -Glu with a TalNAc other strand. In contrast to the murein but not D-amino acids used are, above. The stable glycosidic bond and the high degree of cross-linking of several layers Pseudopeptidoglycan the cell wall gets her strength.
The β -1 ,3 -glucosidic bond pseudomurein is insensitive to the effects of lysozyme.