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6coy
From Proteopedia
Human CLC-1 chloride ion channel, transmembrane domain
Structural highlights
Disease[CLCN1_HUMAN] Thomsen and Becker disease. The disease is caused by mutations affecting the gene represented in this entry. The disease is caused by mutations affecting the gene represented in this entry. Function[CLCN1_HUMAN] Voltage-gated chloride channel. Chloride channels have several functions including the regulation of cell volume; membrane potential stabilization, signal transduction and transepithelial transport.[1] [2] [3] [4] [5] [6] [7] [8] [9] Publication Abstract from PubMedCLC channels mediate passive Cl(-) conduction, while CLC transporters mediate active Cl(-) transport coupled to H(+) transport in the opposite direction. The distinction between CLC-0/1/2 channels and CLC transporters seems undetectable by amino acid sequence. To understand why they are different functionally we determined the structure of the human CLC-1 channel. Its 'glutamate gate' residue, known to mediate proton transfer in CLC transporters, adopts a location in the structure that appears to preclude it from its transport function. Furthermore, smaller side chains produce a wider pore near the intracellular surface, potentially reducing a kinetic barrier for Cl(-) conduction. When the corresponding residues are mutated in a transporter, it is converted to a channel. Finally, Cl(-) at key sites in the pore appear to interact with reduced affinity compared to transporters. Thus, subtle differences in glutamate gate conformation, internal pore diameter and Cl(-) affinity distinguish CLC channels and transporters. Structure of the CLC-1 chloride channel from Homo sapiens.,Park E, MacKinnon R Elife. 2018 May 29;7. pii: 36629. doi: 10.7554/eLife.36629. PMID:29809153[10] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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Categories: Human | Large Structures | MacKinnon, R | Park, E | Channel | Chloride | Clc | Transport protein
