View source for 4cbk


==The c-ring ion binding site of the ATP synthase from Bacillus pseudofirmus OF4 is adapted to alkaliphilic cell physiology==
<StructureSection load='4cbk' size='340' side='right'caption='[[4cbk]], [[Resolution|resolution]] 2.42&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[4cbk]] is a 13 chain structure with sequence from [https://en.wikipedia.org/wiki/Alkalihalophilus_pseudofirmus_OF4 Alkalihalophilus pseudofirmus OF4]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4CBK OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4CBK 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]] 2.42&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=DPV:DODECYL+2-(TRIMETHYLAMMONIO)ETHYL+PHOSPHATE'>DPV</scene>, <scene name='pdbligand=FME:N-FORMYLMETHIONINE'>FME</scene>, <scene name='pdbligand=LMT:DODECYL-BETA-D-MALTOSIDE'>LMT</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</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=4cbk FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4cbk OCA], [https://pdbe.org/4cbk PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4cbk RCSB], [https://www.ebi.ac.uk/pdbsum/4cbk PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4cbk ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/ATPL_ALKPO ATPL_ALKPO] F(1)F(0) ATP synthase produces ATP from ADP in the presence of a proton or sodium gradient. F-type ATPases consist of two structural domains, F(1) containing the extramembraneous catalytic core and F(0) containing the membrane proton channel, linked together by a central stalk and a peripheral stalk. During catalysis, ATP synthesis in the catalytic domain of F(1) is coupled via a rotary mechanism of the central stalk subunits to proton translocation.[HAMAP-Rule:MF_01396]  Key component of the F(0) channel; it plays a direct role in translocation across the membrane. A homomeric c-ring of between 10-14 subunits forms the central stalk rotor element with the F(1) delta and epsilon subunits.[HAMAP-Rule:MF_01396]
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== Publication Abstract from PubMed ==
In the c-ring rotor of ATP synthases ions are shuttled across the membrane during ATP synthesis by a unique rotary mechanism. We investigated characteristics of the c-ring from the alkaliphile Bacillus pseudofirmus OF4 with respect to evolutionary adaptations to operate with protons at high environmental pH. The X-ray structures of the wild-type c13 ring at pH 9.0 and a 'neutralophile-like' mutant (P51A) at pH 4.4, at 2.4 and 2.8 A resolution, respectively, reveal a dependency of the conformation and protonation state of the proton-binding glutamate (E54 ) on environmental hydrophobicity. Faster labeling kinetics with the inhibitor dicyclohexylcarbodiimide (DCCD) demonstrate a greater flexibility of E54 in the mutant due to reduced water occupancy within the H+ -binding site. A second 'neutralophile-like' mutant (V21N) shows reduced growth at high pH, which is explained by restricted conformational freedom of the mutant's E54 carboxylate. The study directly connects subtle structural adaptations of the c-ring ion-binding site to in vivo effects of alkaliphile cell physiology.

The c-ring ion-binding site of the ATP synthase from Bacillus pseudofirmus OF4 is adapted to alkaliphilic lifestyle.,Preiss L, Langer JD, Hicks DB, Liu J, Yildiz O, Krulwich TA, Meier T Mol Microbiol. 2014 Apr 8. doi: 10.1111/mmi.12605. PMID:24707994<ref>PMID:24707994</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 4cbk" style="background-color:#fffaf0;"></div>

==See Also==
*[[ATPase 3D structures|ATPase 3D structures]]
== References ==
<references/>
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</StructureSection>
[[Category: Alkalihalophilus pseudofirmus OF4]]
[[Category: Large Structures]]
[[Category: Meier T]]
[[Category: Preiss L]]
[[Category: Yildiz O]]