View source for 4czb


==Structure of the sodium proton antiporter MjNhaP1 from Methanocaldococcus jannaschii at pH 8.==
<StructureSection load='4czb' size='340' side='right'caption='[[4czb]], [[Resolution|resolution]] 3.50&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[4czb]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Methanocaldococcus_jannaschii Methanocaldococcus jannaschii]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4CZB OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4CZB FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 3.5&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=K:POTASSIUM+ION'>K</scene>, <scene name='pdbligand=TAM:TRIS(HYDROXYETHYL)AMINOMETHANE'>TAM</scene></td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=4czb FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4czb OCA], [https://pdbe.org/4czb PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4czb RCSB], [https://www.ebi.ac.uk/pdbsum/4czb PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4czb ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/NAH1_METJA NAH1_METJA] This is a Na(+)/H(+) antiporter. Can also transport lithium.<ref>PMID:12220668</ref> 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Sodium/proton antiporters are essential for sodium and pH homeostasis and play a major role in human health and disease. We determined the structures of the archaeal sodium/proton antiporter MjNhaP1 in two complementary states. The inward-open state was obtained by x-ray crystallography in the presence of sodium at pH8, where the transporter is highly active. The outward-open state was obtained by electron crystallography without sodium at pH4, where MjNhaP1 is inactive. Comparison of both structures reveals a 7{degree sign} tilt of the 6 helix bundle. 22Na+ uptake measurements indicate non-cooperative transport with an activity maximum at pH7.5. We conclude that binding of a Na+ ion from the outside induces helix movements that close the extracellular cavity, open the cytoplasmic funnel, and result in a ~5 A vertical relocation of the ion binding site to release the substrate ion into the cytoplasm.

Structure and transport mechanism of the sodium/protonantiporter MjNhaP1.,Paulino C, Wohlert D, Kapotova E, Yildiz O, Kuhlbrandt W Elife. 2014 Nov 26;3. doi: 10.7554/eLife.03583. PMID:25426803<ref>PMID:25426803</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 4czb" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Methanocaldococcus jannaschii]]
[[Category: Kapotova E]]
[[Category: Kuhlbrandt W]]
[[Category: Paulino C]]
[[Category: Woehlert D]]
[[Category: Yildiz O]]