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Keyword - Cell outer membrane (KW-0998)

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Protein found in or associated with the prokaryotic cell outer membrane, a selectively permeable membrane which separates the prokaryotic periplasm from its surroundings. Traditionally only Gram-negative bacteria were thought of as having an outer membrane, but recent work has shown some Actinobacteria, including Mycobacterium tuberculosis, as well as at least 1 archaea (Ignicoccus hospitalis) have a cell outer membrane.


  • Outer membrane


Cellular component

Gene Ontology


cell outer membrane [ GO:0009279 ]


Cell outer membraneMembraneCellular component
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