Bacterial membrane

Compartmentalization allows cells to retain and organize the vast array of solutes and macromolecules required for life. However, life depends equally on the capacity of the cell for selective movement of molecules between distinct compartments. For example, a significant subset of proteins must be translocated from their site of synthesis in the cytoplasm, across one or more membranes, to reach their final functional destination within a topologically distinct compartment. Irrespective of the target membrane (endoplasmic reticulum, mitochondrial outer membrane, bacterial cytoplasmic membrane, etc.), translocation generally requires that the protein destined for translocation contains a cis-acting targeting element that directs it to the proper membrane. 

ATP synthase, FoFi(8) H+ gradient Multiple subunits forming Fo and Fi particles Inner mitochondrial membrane, thylakoid membrane, bacterial plasma membrane Rotation of y subunit leading to ATP synthesis... 

The studies confirm that the close-packed region of the membrane forms the rate-limiting barrier for trans-membrane movement by simple diffusion. This situation may be physiologically relevant in that the leakiness of the cell membrane can clearly be affected by physiological control of the cholesterol content of the cell membrane. Bacterial and plant cell membranes which do not contain cholesterol and which are not particularly leaky must have other compositional pecuharities to provide well-sealed membranes. 

Bacterial surface layers and outer membrane Bacterial llpopolysaccharides... 

Staining Applications Vacuolar membrane plasma membrane bacterial membrane " lipid membrane plasma membrane-bound flav(mroteins nuclear envelope (NE) synaptic vesicles secretory vesicles lac-totroph vesicles synaptic terminals neurons " en-docytosis exocjrtosis smooth-muscle-associated airway receptors (SMARs) in lungs embryos ... 

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