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UNF MCB 2010C - Microbio Notes- Bacterial Cell Membranes

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Bacterial Cell Membranes- Phospholipid Structure Overviewo Head = glycerol with phosphate group Polar, hydrophilico Tail = fatty acids  Nonpolar, hydrophobico Forms an asymmetrical bilayer Fluid mosaic model Selectively permeable Receptors respond to environmento Contains proteins Peripheral, integral, and transmembrane- Bacteria and Cell Membraneso Similar in structure to eukaryotic membranes o 3 main functions Respiration  Photosynthesis  Lipid and cell wall synthesis - Cell Membranes and Transportationo Active transport = uses energy; moves molecules against gradient  Proton motive force- Flagellar motility - Antibiotic pumps Group Transport- Alter molecules so they won’t leak outo Virulence  Secretes toxins  Porins and porin loss in antibiotic resistant bacteria- Other Layers o Glycocalyx = general term for secretions Network of polysaccharides  Gel-like, sticky o Slime Layer = unorganized layer of carbs Easily removedo Capsule = gel layer of polysaccharides constantly produced by bacteria Attached; not easily removed Negative stains Source of virulence- Hides surface antigens -> sugars are poorly detected by WBCs- Sliminess -> Inhibits phagocytosis by


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UNF MCB 2010C - Microbio Notes- Bacterial Cell Membranes

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