View source for 5but


==Crystal structure of inactive conformation of KtrAB K+ transporter==
<StructureSection load='5but' size='340' side='right'caption='[[5but]], [[Resolution|resolution]] 5.97&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[5but]] is a 8 chain structure with sequence from [https://en.wikipedia.org/wiki/Bacillus_subtilis Bacillus subtilis]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5BUT OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5BUT 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]] 5.97&#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></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=5but FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5but OCA], [https://pdbe.org/5but PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5but RCSB], [https://www.ebi.ac.uk/pdbsum/5but PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5but ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/KTRA_BACSU KTRA_BACSU] Catalytic subunit of the KtrAB potassium uptake transporter. The 2 major potassium transporter complexes KtrAB and KtrCD confer resistance to both suddenly imposed and prolonged osmotic stress.<ref>PMID:12562800</ref> 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
KtrAB belongs to the Trk/Ktr/HKT superfamily of monovalent cation (K+ and Na+) transport proteins that closely resemble K+ channels. These proteins underlie a plethora of cellular functions that are crucial for environmental adaptation in plants, fungi, archaea, and bacteria. The activation mechanism of the Trk/Ktr/HKT proteins remains unknown. It has been shown that ATP stimulates the activity of KtrAB while ADP does not. Here, we present X-ray structural information on the KtrAB complex with bound ADP. A comparison with the KtrAB-ATP structure reveals conformational changes in the ring and in the membrane protein. In combination with a biochemical and functional analysis, we uncover how ligand-dependent changes in the KtrA ring are propagated to the KtrB membrane protein and conclude that, despite their structural similarity, the activation mechanism of KtrAB is markedly different from the activation mechanism of K+ channels.

Dissecting the Molecular Mechanism of Nucleotide-Dependent Activation of the KtrAB K+ Transporter.,Szollosi A, Vieira-Pires RS, Teixeira-Duarte CM, Rocha R, Morais-Cabral JH PLoS Biol. 2016 Jan 15;14(1):e1002356. doi: 10.1371/journal.pbio.1002356., eCollection 2016 Jan. PMID:26771197<ref>PMID:26771197</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 5but" style="background-color:#fffaf0;"></div>
== References ==
<references/>
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</StructureSection>
[[Category: Bacillus subtilis]]
[[Category: Large Structures]]
[[Category: Morais-Cabral JH]]
[[Category: Vieira-Pires RS]]