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==Mycobacterium smegmatis ATP synthase state 3b==
<StructureSection load='7njr' size='340' side='right'caption='[[7njr]], [[Resolution|resolution]] 2.56&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[7njr]] is a 20 chain structure with sequence from [https://en.wikipedia.org/wiki/Mycolicibacterium_smegmatis_MC2_155 Mycolicibacterium smegmatis MC2 155]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7NJR OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7NJR FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Electron Microscopy, [[Resolution|Resolution]] 2.56&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ADP:ADENOSINE-5-DIPHOSPHATE'>ADP</scene>, <scene name='pdbligand=ATP:ADENOSINE-5-TRIPHOSPHATE'>ATP</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</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=7njr FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7njr OCA], [https://pdbe.org/7njr PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7njr RCSB], [https://www.ebi.ac.uk/pdbsum/7njr PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7njr ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/ATPA_MYCS2 ATPA_MYCS2] Produces ATP from ADP in the presence of a proton gradient across the membrane. The alpha chain is a regulatory subunit.[HAMAP-Rule:MF_01346]
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== Publication Abstract from PubMed ==
The structure has been determined by electron cryomicroscopy of the adenosine triphosphate (ATP) synthase from Mycobacterium smegmatis This analysis confirms features in a prior description of the structure of the enzyme, but it also describes other highly significant attributes not recognized before that are crucial for understanding the mechanism and regulation of the mycobacterial enzyme. First, we resolved not only the three main states in the catalytic cycle described before but also eight substates that portray structural and mechanistic changes occurring during a 360 degrees catalytic cycle. Second, a mechanism of auto-inhibition of ATP hydrolysis involves not only the engagement of the C-terminal region of an alpha-subunit in a loop in the gamma-subunit, as proposed before, but also a "fail-safe" mechanism involving the b'-subunit in the peripheral stalk that enhances engagement. A third unreported characteristic is that the fused bdelta-subunit contains a duplicated domain in its N-terminal region where the two copies of the domain participate in similar modes of attachment of the two of three N-terminal regions of the alpha-subunits. The auto-inhibitory plus the associated "fail-safe" mechanisms and the modes of attachment of the alpha-subunits provide targets for development of innovative antitubercular drugs. The structure also provides support for an observation made in the bovine ATP synthase that the transmembrane proton-motive force that provides the energy to drive the rotary mechanism is delivered directly and tangentially to the rotor via a Grotthuss water chain in a polar L-shaped tunnel.

Structure of the ATP synthase from Mycobacterium smegmatis provides targets for treating tuberculosis.,Montgomery MG, Petri J, Spikes TE, Walker JE Proc Natl Acad Sci U S A. 2021 Nov 23;118(47):e2111899118. doi: , 10.1073/pnas.2111899118. PMID:34782468<ref>PMID:34782468</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 7njr" style="background-color:#fffaf0;"></div>

==See Also==
*[[ATPase 3D structures|ATPase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Mycolicibacterium smegmatis MC2 155]]
[[Category: Montgomery MG]]
[[Category: Petri J]]
[[Category: Spikes TE]]
[[Category: Walker JE]]