Archaeal cell walls

Definition

Archaeal cell walls are specialized structures that protect archaeal cells and provide shape, differing significantly from bacterial cell walls. They lack peptidoglycan and often contain unique polymers like pseudopeptidoglycan.

5 Must Know Facts For Your Next Test

1. Archaeal cell walls do not contain peptidoglycan, unlike bacterial cell walls.
2. Some archaea have cell walls made of pseudopeptidoglycan, which is similar to but chemically distinct from bacterial peptidoglycan.
3. Other archaea may have protein-based S-layers as their primary structural component.
4. Archaeal cell walls can be composed of polysaccharides or glycoproteins, depending on the species.
5. The distinctive composition of archaeal cell walls contributes to their ability to thrive in extreme environments.

Related terms

Peptidoglycan:

A polymer consisting of sugars and amino acids that forms a mesh-like layer outside the plasma membrane of most bacteria.

Pseudopeptidoglycan:

A polymer similar to peptidoglycan found in some archaeal cell walls, containing different chemical linkages.

S-layer:

A lattice-like structure formed by proteins or glycoproteins that can serve as the outermost layer of some prokaryotic cells, including many archaea.