Ways to think about peptidoglycan. Bacterial Cell Structure (continued). You are here. Gram negative cell wall. Outer membrane. Lipid bilayer membrane: Asymmetric Inner and outer leaflets Inner leaflet made of phospholipids; outer leaflet is made of lipopolysaccharide (LPS)
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extends from cell surface.
contains odd sugars e.g. KDO.
Gln-P and fatty acids
take the place of
“Sugar covering”: capsules are firmly
attached, slime layers are loose.
Multiple advantages to cells:
protection from predators, WBCs
protection from biocides (as part of biofilms)
attachment to surfaces and site of attachment by others.
Both are appendages made of protein
Singular: fimbria, pilus
Both used for attachment
Fimbriae: to surfaces (incl. host cells) and other bacteria.
Pili: to other bacteria for exchanging DNA (“sex”).
www.ai.mit.edu/people/ tk/ce/flagella-s.gifwww.bmb.leeds.ac.uk/.../icu8/ introduction/bacteria.html
Cytoplasm may also contain inclusions, gas vacuoles,
extended membrane systems, or magnetosomes.
But generally NO membrane-bound organelles.
“Membrane”- coated pieces of magnetite, assist bacteria in moving to microaerophilic environments. An organelle?
North is down.