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- Facilitated_diffusion abstract "Facilitated diffusion (also known as facilitated transport or passive-mediated transport) is the process of spontaneous passive transport (as opposed to active transport) of molecules or ions across a biological membrane via specific transmembrane integral proteins. Being passive, facilitated transport does not directly require chemical energy from ATP hydrolysis in the transport step itself; rather, molecules and ions move down their concentration gradient reflecting its diffusive nature.Facilitated diffusion is different from free diffusion in several ways. First, the transport relies on molecular binding between the cargo and the membrane-embedded channel or carrier protein. Second, the rate of facilitated diffusion is saturable with respect to the concentration difference between the two phases; unlike free diffusion which is linear in the concentration difference. Third, the temperature dependence of facilitated transport is substantially different due to the presence of an activated binding event, as compared to free diffusion where the dependence on temperature is mild.Polar molecules and large ions dissolved in water cannot diffuse freely across the plasma membrane due to the hydrophobic nature of the fatty acid tails of the phospholipids that make up the lipid bilayer. Only small, non-polar molecules, such as oxygen and carbon dioxide, can diffuse easily across the membrane. Hence, no nonpolar molecules are transported by proteins in the form of transmembrane channels. These channels are gated, meaning that they open and close, and thus deregulate the flow of ions or small polar molecules across membranes, sometimes against the osmotic gradient. Larger molecules are transported by transmembrane carrier proteins, such as permeases, that change their conformation as the molecules are carried across (e.g. glucose or amino acids). Non-polar molecules, such as retinol or lipids, are poorly soluble in water. They are transported through aqueous compartments of cells or through extracellular space by water-soluble carriers (e.g. retinol binding protein). The metabolites are not altered because no energy is required for facilitated diffusion. Only permease changes its shape in order to transport metabolites. The form of transport through a cell membrane in which a metabolite is modified is called group translocation transportation.Glucose, sodium ions, and chloride ions are just a few examples of molecules and ions that must efficiently cross the plasma membrane but to which the lipid bilayer of the membrane is virtually impermeable. Their transport must therefore be \"facilitated\" by proteins that span the membrane and provide an alternative route or bypass mechanism.Various attempts have been made by engineers to mimic the process of facilitated transport in synthetic (i.e., non-biological) membranes for use in industrial-scale gas and liquid separations, but these have met with limited success to date, most often for reasons related to poor carrier stability and/or dissociation of the carrier from the membrane.".
- Facilitated_diffusion thumbnail Scheme_facilitated_diffusion_in_cell_membrane-en.svg?width=300.
- Facilitated_diffusion wikiPageExternalLink Facilitated_transport.
- Facilitated_diffusion wikiPageExternalLink facilitated_diffusion.html.
- Facilitated_diffusion wikiPageID "11712".
- Facilitated_diffusion wikiPageLength "4412".
- Facilitated_diffusion wikiPageOutDegree "24".
- Facilitated_diffusion wikiPageRevisionID "702732052".
- Facilitated_diffusion wikiPageWikiLink Active_transport.
- Facilitated_diffusion wikiPageWikiLink Amino_acid.
- Facilitated_diffusion wikiPageWikiLink Biological_membrane.
- Facilitated_diffusion wikiPageWikiLink Carbon_dioxide.
- Facilitated_diffusion wikiPageWikiLink Category:Diffusion.
- Facilitated_diffusion wikiPageWikiLink Category:Transport_proteins.
- Facilitated_diffusion wikiPageWikiLink Cell_membrane.
- Facilitated_diffusion wikiPageWikiLink Diffusion.
- Facilitated_diffusion wikiPageWikiLink Glucose.
- Facilitated_diffusion wikiPageWikiLink Hydrophobe.
- Facilitated_diffusion wikiPageWikiLink Lipid.
- Facilitated_diffusion wikiPageWikiLink Lipid_bilayer.
- Facilitated_diffusion wikiPageWikiLink Molecule.
- Facilitated_diffusion wikiPageWikiLink Oxygen.
- Facilitated_diffusion wikiPageWikiLink PEP_group_translocation.
- Facilitated_diffusion wikiPageWikiLink Passive_transport.
- Facilitated_diffusion wikiPageWikiLink Permease.
- Facilitated_diffusion wikiPageWikiLink Phospholipid.
- Facilitated_diffusion wikiPageWikiLink Retinol.
- Facilitated_diffusion wikiPageWikiLink Retinol_binding_protein.
- Facilitated_diffusion wikiPageWikiLink Transmembrane_channels.
- Facilitated_diffusion wikiPageWikiLink Transmembrane_protein.
- Facilitated_diffusion wikiPageWikiLink File:Blausen_0394_Facilitated_Diffusion.png.
- Facilitated_diffusion wikiPageWikiLink File:Scheme_facilitated_diffusion_in_cell_membrane-en.svg.
- Facilitated_diffusion wikiPageWikiLinkText "Facilitated diffusion".
- Facilitated_diffusion wikiPageWikiLinkText "diffusion facilitated".
- Facilitated_diffusion wikiPageWikiLinkText "diffusion through membranes".
- Facilitated_diffusion wikiPageWikiLinkText "facilitated diffusion".
- Facilitated_diffusion wikiPageWikiLinkText "facilitated transport".
- Facilitated_diffusion wikiPageWikiLinkText "facilitates".
- Facilitated_diffusion wikiPageWikiLinkText "lipid-mediated free diffusion".
- Facilitated_diffusion wikiPageUsesTemplate Template:Biology-stub.
- Facilitated_diffusion wikiPageUsesTemplate Template:Membrane_transport.
- Facilitated_diffusion wikiPageUsesTemplate Template:Refimprove.
- Facilitated_diffusion wikiPageUsesTemplate Template:Reflist.
- Facilitated_diffusion subject Category:Diffusion.
- Facilitated_diffusion subject Category:Transport_proteins.
- Facilitated_diffusion hypernym Process.
- Facilitated_diffusion type Election.
- Facilitated_diffusion comment "Facilitated diffusion (also known as facilitated transport or passive-mediated transport) is the process of spontaneous passive transport (as opposed to active transport) of molecules or ions across a biological membrane via specific transmembrane integral proteins.".
- Facilitated_diffusion label "Facilitated diffusion".
- Facilitated_diffusion sameAs Q2155231.
- Facilitated_diffusion sameAs انتشار_مسهل.
- Facilitated_diffusion sameAs Difusió_facilitada.
- Facilitated_diffusion sameAs Erleichterte_Diffusion.
- Facilitated_diffusion sameAs انتشار_آسانشده.
- Facilitated_diffusion sameAs Fasilitoitunut_diffuusio.
- Facilitated_diffusion sameAs Diffusion_facilitée.
- Facilitated_diffusion sameAs Gefaciliteerde_diffusie.
- Facilitated_diffusion sameAs Dyfuzja_wspomagana.
- Facilitated_diffusion sameAs Difusão_facilitada.
- Facilitated_diffusion sameAs m.0336_.
- Facilitated_diffusion sameAs Difuziune_facilitată.
- Facilitated_diffusion sameAs การแพร่สารแบบฟาซิลิเทต.
- Facilitated_diffusion sameAs Q2155231.
- Facilitated_diffusion wasDerivedFrom Facilitated_diffusion?oldid=702732052.
- Facilitated_diffusion depiction Scheme_facilitated_diffusion_in_cell_membrane-en.svg.
- Facilitated_diffusion isPrimaryTopicOf Facilitated_diffusion.