Editing Secretion (section)

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[[File:Secretory mechanism.jpg|thumb|440px]]
{{Short description|Controlled release of substances by cells or tissues}}
'''Secretion''' is the movement of material from one point to another, such as a secreted [[chemical substance]] from a [[cell (biology)|cell]] or [[gland]]. In contrast, [[excretion]] is the removal of certain substances or waste products from a cell or organism. The classical mechanism of cell secretion is via secretory portals at the [[Cell membrane|plasma membrane]] called [[porosomes]].<ref name="pmid 22659300">{{cite journal | vauthors = Lee JS, Jeremic A, Shin L, Cho WJ, Chen X, Jena BP | title = Neuronal porosome proteome: Molecular dynamics and architecture | journal = Journal of Proteomics | volume = 75 | issue = 13 | pages = 3952–62 | date = July 2012 | pmid = 22659300 | doi = 10.1016/j.jprot.2012.05.017 | pmc = 4580231 }}</ref> Porosomes are permanent cup-shaped [[lipoprotein]] structures embedded in the cell membrane, where secretory vesicles transiently dock and fuse to release intra-vesicular contents from the cell.

[[Bacterial secretion system|Secretion in bacterial species]] means the transport or translocation of effector molecules. For example: [[proteins]], [[enzymes]] or [[toxin]]s (such as [[cholera toxin]] in [[pathogenic bacteria]] e.g. ''[[Vibrio cholerae]]'') from across the interior ([[cytoplasm]] or [[cytosol]]) of a bacterial cell to its exterior. Secretion is a very important mechanism in bacterial functioning and operation in their natural surrounding environment for adaptation and survival.