What is the S layer of the cell wall of archaea?

The S-layer (surface layer) of Archaea is a protein lattice in which a number of very similar proteins (sarcin, thermonuclease, thermostable nuclease, etc.) are arranged in an hexagonal lattice.

The S-layer is the most abundant cell wall component in Archaea. It is a protein lattice.

S-layers are the most abundant cell envelope components in Archaea and play important roles in the structural integrity of the cell. S-layers are formed by self-assembling proteins called S-layer proteins. There are several types of S-layer proteins, including thermonuclease, thermostable nuclease, thermosarcin, thermostable sarcin, thermostable thermoendopeptidase, thermostable dipeptidase, and thermostable thermolysin.

Are archaea cell walls Gram positive or negative?

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"The ancients are not to believed on the evidence of their writings; a man is not to believed when he says he saw a pig fly. We shall all believe everything we are told if we can; but we will not believe what we are told if it is contrary to human nature.0216795. It was proposed that the outer membrane of Archaea consists of only lipids with no peptidoglycan, since no peptidoglycan synthase homologues had been found in these microorganisms. In addition, the inner membrane (IM) has different properties from bacterial IMs. These GPs and GPLs are thought to be involved in maintaining the membrane integrity during envelope stress such as salt concentrations above that of seawater.

Does fungi and archaea have cell wall?

Cell wall is present at all stages in fungal life cycle and its absence causes cell death.

These characteristics are thought to be ancestral since early branching eukaryotes, which lack the wall, were once considered unicellular organisms or even multinucleated aggregates of cells. Many years have passed since that observation. There has been no doubt that actinomycetes have cell wall but most of them were not aware of its existence and thus failed to mention its presence in their works. The fact that, in addition to many bacteria, all fungi and archaea form cell wall has attracted our attention for more than 20 years. We started investigating the cell wall of actinomycetes with the aim to confirm our presumption of the shared cell wall between fungi and archaea. If we look into history of cell wall research in this field, it has not always been simple to discern the cell wall-forming capability of a certain bacterium even during 20 years since the first report. Therefore, when we conducted our preliminary test for cell wall formation, we also focused on mycelial morphology, which might have had an importance in early studies of cell wall. Mycelium was usually formed as filaments during cultivation of any bacteria. When the mycelium appeared, it was assumed as mycelium formation but the term often referred to actinomycete filament was a kind of a technical term. For example, a cell from which the colony of filamentous actinomycetes was grown was called a 'filamentous cell', which is actually a culture tube.