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1zcd

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[[Image:1zcd.gif|left|200px]]
 
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{{Structure
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==Crystal structure of the Na+/H+ antiporter NhaA==
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|PDB= 1zcd |SIZE=350|CAPTION= <scene name='initialview01'>1zcd</scene>, resolution 3.45&Aring;
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<StructureSection load='1zcd' size='340' side='right'caption='[[1zcd]], [[Resolution|resolution]] 3.45&Aring;' scene=''>
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|SITE=
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== Structural highlights ==
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|LIGAND=
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<table><tr><td colspan='2'>[[1zcd]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. The December 2011 RCSB PDB [https://pdb.rcsb.org/pdb/static.do?p=education_discussion/molecule_of_the_month/index.html Molecule of the Month] feature on ''Complex I'' by David Goodsell is [https://dx.doi.org/10.2210/rcsb_pdb/mom_2011_12 10.2210/rcsb_pdb/mom_2011_12]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1ZCD OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1ZCD FirstGlance]. <br>
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|ACTIVITY=
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</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 3.45&#8491;</td></tr>
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|GENE= nhaA ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=562 Escherichia coli])
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1zcd FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1zcd OCA], [https://pdbe.org/1zcd PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1zcd RCSB], [https://www.ebi.ac.uk/pdbsum/1zcd PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1zcd ProSAT]</span></td></tr>
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|DOMAIN=
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</table>
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|RELATEDENTRY=
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== Function ==
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|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1zcd FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1zcd OCA], [http://www.ebi.ac.uk/pdbsum/1zcd PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1zcd RCSB]</span>
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[https://www.uniprot.org/uniprot/NHAA_ECOLI NHAA_ECOLI] Na(+)/H(+) antiporter that extrudes sodium in exchange for external protons. Catalyzes the exchange of 2 H(+) per Na(+). Can mediate sodium uptake when a transmembrane pH gradient is applied. Active at alkaline pH. Activity is strongly down-regulated below pH 6.5.<ref>PMID:1645730</ref>
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}}
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== Evolutionary Conservation ==
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[[Image:Consurf_key_small.gif|200px|right]]
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'''Crystal structure of the Na+/H+ antiporter NhaA'''
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Check<jmol>
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<jmolCheckbox>
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<scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/zc/1zcd_consurf.spt"</scriptWhenChecked>
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==Overview==
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<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
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The control by Na+/H+ antiporters of sodium/proton concentration and cell volume is crucial for the viability of all cells. Adaptation to high salinity and/or extreme pH in plants and bacteria or in human heart muscles requires the action of Na+/H+ antiporters. Their activity is tightly controlled by pH. Here we present the crystal structure of pH-downregulated NhaA, the main antiporter of Escherichia coli and many enterobacteria. A negatively charged ion funnel opens to the cytoplasm and ends in the middle of the membrane at the putative ion-binding site. There, a unique assembly of two pairs of short helices connected by crossed, extended chains creates a balanced electrostatic environment. We propose that the binding of charged substrates causes an electric imbalance, inducing movements, that permit a rapid alternating-access mechanism. This ion-exchange machinery is regulated by a conformational change elicited by a pH signal perceived at the entry to the cytoplasmic funnel.
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<text>to colour the structure by Evolutionary Conservation</text>
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</jmolCheckbox>
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==About this Structure==
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</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=1zcd ConSurf].
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1ZCD is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1ZCD OCA].
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<div style="clear:both"></div>
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== References ==
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==Reference==
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<references/>
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Structure of a Na+/H+ antiporter and insights into mechanism of action and regulation by pH., Hunte C, Screpanti E, Venturi M, Rimon A, Padan E, Michel H, Nature. 2005 Jun 30;435(7046):1197-202. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/15988517 15988517]
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__TOC__
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</StructureSection>
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[[Category: Complex I]]
[[Category: Escherichia coli]]
[[Category: Escherichia coli]]
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[[Category: Single protein]]
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[[Category: Large Structures]]
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[[Category: Hunte, C.]]
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[[Category: RCSB PDB Molecule of the Month]]
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[[Category: Michel, H.]]
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[[Category: Hunte C]]
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[[Category: Padan, E.]]
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[[Category: Michel H]]
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[[Category: Rimon, A.]]
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[[Category: Padan E]]
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[[Category: Screpanti, E.]]
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[[Category: Rimon A]]
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[[Category: Venturi, M.]]
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[[Category: Screpanti E]]
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[[Category: antiporter]]
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[[Category: Venturi M]]
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[[Category: membrane protein]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Mar 31 01:33:55 2008''
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Current revision

Crystal structure of the Na+/H+ antiporter NhaA

PDB ID 1zcd

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