7jna

<table><tr><td colspan='2'>[[7jna]] is a 3 chain structure with sequence from [http://en.wikipedia.org/wiki/Human Human]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7JNA OCA]. For a <b>guided tour on the structure components</b> use [http://proteopedia.org/fgij/fg.htm?mol=7JNA FirstGlance]. <br>

</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</scene></td></tr>

<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">PACC1, C1orf75, TMEM206 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 HUMAN])</td></tr>

<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://proteopedia.org/fgij/fg.htm?mol=7jna FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7jna OCA], [http://pdbe.org/7jna PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=7jna RCSB], [http://www.ebi.ac.uk/pdbsum/7jna PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=7jna ProSAT]</span></td></tr>

== Function ==

[[http://www.uniprot.org/uniprot/PACC1_HUMAN PACC1_HUMAN]] Proton-activated chloride channel that mediates import of chloride ion in response to extracellular acidic pH (PubMed:31023925, PubMed:31318332). Involved in acidosis-induced cell death by mediating chloride influx and subsequent cell swelling (PubMed:31023925, PubMed:31318332).<ref>PMID:31023925</ref> <ref>PMID:31318332</ref>

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== Publication Abstract from PubMed ==

The proton-activated chloride channel (PAC) is active across a wide range of mammalian cells and is involved in acid-induced cell death and tissue injury(1-3). PAC has recently been shown to represent a novel and evolutionarily conserved protein family(4,5). Here we present two cryo-electron microscopy structures of human PAC in a high-pH resting closed state and a low-pH proton-bound non-conducting state. PAC is a trimer in which each subunit consists of a transmembrane domain (TMD), which is formed of two helices (TM1 and TM2), and an extracellular domain (ECD). Upon a decrease of pH from 8 to 4, we observed marked conformational changes in the ECD-TMD interface and the TMD. The rearrangement of the ECD-TMD interface is characterized by the movement of the histidine 98 residue, which is, after acidification, decoupled from the resting position and inserted into an acidic pocket that is about 5 A away. Within the TMD, TM1 undergoes a rotational movement, switching its interaction partner from its cognate TM2 to the adjacent TM2. The anion selectivity of PAC is determined by the positively charged lysine 319 residue on TM2, and replacing lysine 319 with a glutamate residue converts PAC to a cation-selective channel. Our data provide a glimpse of the molecular assembly of PAC, and a basis for understanding the mechanism of proton-dependent activation.

 

== References ==

[[Category: Human]]

[[Category: Du, J]]

[[Category: Lu, W]]

[[Category: Ruan, R]]

[[Category: Tmem206]]