When.com Web Search

Search results

  1. Results From The WOW.Com Content Network
  2. Ion channel - Wikipedia

    en.wikipedia.org/wiki/Ion_channel

    Ion channels are pore-forming membrane proteins that allow ions to pass through the channel pore. Their functions include establishing a resting membrane potential , [ 1 ] shaping action potentials and other electrical signals by gating the flow of ions across the cell membrane , controlling the flow of ions across secretory and epithelial ...

  3. Membrane transport protein - Wikipedia

    en.wikipedia.org/wiki/Membrane_transport_protein

    Unlike channel proteins which only transport substances through membranes passively, carrier proteins can transport ions and molecules either passively through facilitated diffusion, or via secondary active transport. [12] A carrier protein is required to move particles from areas of low concentration to areas of high concentration.

  4. Aquaporin - Wikipedia

    en.wikipedia.org/wiki/Aquaporin

    Schematic diagram of the 2D structure of aquaporin 1 depicting the six transmembrane alpha-helices and the five interhelical loop regions A-E The 3D structure of aquaporin Z highlighting the 'hourglass'-shaped water channel that cuts through the center of the protein. Aquaporin proteins are composed of a bundle of six transmembrane α-helices ...

  5. Aquaporin-4 - Wikipedia

    en.wikipedia.org/wiki/Aquaporin-4

    Aquaporin-4's overall function is to provide fast water transportation as well as maintain homeostatic balance within the central nervous system. This channel can transport water up to speeds of 3E9 molecules per second. [7] It is the primary water channel protein that reconciles the homeostasis of water in the CNS. [6]

  6. Ligand-gated ion channel - Wikipedia

    en.wikipedia.org/wiki/Ligand-gated_ion_channel

    The prototypic ligand-gated ion channel is the nicotinic acetylcholine receptor. It consists of a pentamer of protein subunits (typically ααβγδ), with two binding sites for acetylcholine (one at the interface of each alpha subunit). When the acetylcholine binds it alters the receptor's configuration (twists the T2 helices which moves the ...

  7. Aquaporin-1 - Wikipedia

    en.wikipedia.org/wiki/Aquaporin-1

    Aquaporin 1 (AQP-1) is a protein that in humans is encoded by the AQP1 gene. AQP-1 is a widely expressed water channel , whose physiological function has been most thoroughly characterized in the kidney .

  8. Sodium channel - Wikipedia

    en.wikipedia.org/wiki/Sodium_channel

    C is the sodium channel . Sodium channels are integral membrane proteins that form ion channels, conducting sodium ions (Na +) through a cell's membrane. [1] [2] They belong to the superfamily of cation channels.

  9. Voltage-gated ion channel - Wikipedia

    en.wikipedia.org/wiki/Voltage-gated_ion_channel

    The open conformation of the ion channel allows for the translocation of ions across the cell membrane, while the closed conformation does not. Voltage-gated ion channels are a class of transmembrane proteins that form ion channels that are activated by changes in a cell's electrical membrane potential near the channel. The membrane potential ...