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SecretedCell envelopeS-layerCell wall


A S-layer is a paracrystalline protein thin layer attached to the outermost portion of the cell wall. Found in some bacteria and common in archaea where it can constitute the only cell wall structure outside the plasma membrane. In gram-negative bacteria, the S-layer is directly attached to the outer membrane. In gram-positive bacteria, the S-layer is attached to the peptidoglycan layer. The S-layer may protect the cell from aggressions such as phagocytosis, harmful enzymes, etc. It also allows bacteria to adhere to host cells or other environmental surfaces and to mantain shape and envelope rigidity.


› Cellular component



Gene Ontology


S-layer [ GO:0030115 ]
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