Retrieving "S Layers" from the archives

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1. Archaea

   Linked via "S-layers"

   Cell Wall and Membrane Lipids
   The cell envelope of Archaea is highly variable. While some species possess cell walls composed of pseudopeptidoglycan (pseudomurein), structurally similar to bacterial peptidoglycan but lacking $N$-acetylmuramic acid, many others utilize S-layers (surface-layers) composed of paracrystalline protein or glycoprotein subunits.
   A defining feature of Archaea is the composition of their cellular membranes. Unlike Bacteria and Eukarya, which utilize ester-linked phospholipids derive…