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Cell envelope


The cell envelope comprizes the cell membrane, the cell wall and an outer membrane if present. Gram positive bacteria cell envelope consists of the cytoplasmic membrane, cell wall and capsule. Gram negative envelope consists of the cytoplasmic membrane, cell wall, periplasmic space, outer membrane and capsule. Archeal cell envelope consists generally of single typical bilayer membrane covered by a surface layer (S-layer). Ignicoccus species have exceptionally an outer membrane which encloses a large periplasmic space. Extreme thermophiles and acidophiles have tetraether type glycerophospholipids with C40 isoprenoid chains. The yeast cell envelope is a protecting capsule which consists of the cytoplasmic membrane, the periplasmic space, and the cell wall.




› Cellular component


envelope [ GO:0031975 ]