View source for 7sun


==Atomic model of prestin from gerbil (Meriones unguiculatus)==
<StructureSection load='7sun' size='340' side='right'caption='[[7sun]], [[Resolution|resolution]] 3.60&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[7sun]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Meriones_unguiculatus Meriones unguiculatus] and [https://en.wikipedia.org/wiki/Synthetic_construct Synthetic construct]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7SUN OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7SUN 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]] 3.6&#8491;</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=7sun FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7sun OCA], [https://pdbe.org/7sun PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7sun RCSB], [https://www.ebi.ac.uk/pdbsum/7sun PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7sun ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/S26A5_MERUN S26A5_MERUN] Motor protein that converts auditory stimuli to length changes in outer hair cells and mediates sound amplification in the mammalian hearing organ. Prestin is a bidirectional voltage-to-force converter, it can operate at microsecond rates. It uses cytoplasmic anions as extrinsic voltage sensors, probably chloride and bicarbonate. After binding to a site with millimolar affinity, these anions are translocated across the membrane in response to changes in the transmembrane voltage. They move towards the extracellular surface following hyperpolarization, and towards the cytoplasmic side in response to depolarization. As a consequence, this translocation triggers conformational changes in the protein that ultimately alter its surface area in the plane of the plasma membrane. The area decreases when the anion is near the cytoplasmic face of the membrane (short state), and increases when the ion has crossed the membrane to the outer surface (long state). So, it acts as an incomplete transporter. It swings anions across the membrane, but does not allow these anions to dissociate and escape to the extracellular space. Salicylate, an inhibitor of outer hair cell motility, acts as competitive antagonist at the prestin anion-binding site (By similarity).[https://www.uniprot.org/uniprot/GFP_AEQVI GFP_AEQVI] Energy-transfer acceptor. Its role is to transduce the blue chemiluminescence of the protein aequorin into green fluorescent light by energy transfer. Fluoresces in vivo upon receiving energy from the Ca(2+)-activated photoprotein aequorin.

==See Also==
*[[Prestin|Prestin]]
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</StructureSection>
[[Category: Large Structures]]
[[Category: Meriones unguiculatus]]
[[Category: Synthetic construct]]
[[Category: Butan C]]
[[Category: Santos-Sacchi J]]