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[[Image:1k4d.gif|left|200px]]<br /><applet load="1k4d" size="350" color="white" frame="true" align="right" spinBox="true"
caption="1k4d, resolution 2.30&Aring;" />
'''Potassium Channel KcsA-Fab complex in low concentration of K+'''<br />


==Overview==
==Potassium Channel KcsA-Fab complex in low concentration of K+==
Ion transport proteins must remove an ion's hydration shell to coordinate, the ion selectively on the basis of its size and charge. To discover how, the K+ channel solves this fundamental aspect of ion conduction, we solved, the structure of the KcsA K+ channel in complex with a monoclonal Fab, antibody fragment at 2.0 A resolution. Here we show how the K+ channel, displaces water molecules around an ion at its extracellular entryway, and, how it holds a K+ ion in a square antiprism of water molecules in a cavity, near its intracellular entryway. Carbonyl oxygen atoms within the, selectivity filter form a very similar square antiprism around each K+, binding site, as if to mimic the waters of hydration. The selectivity, filter changes its ion coordination structure in low K+ solutions. This, structural change is crucial to the operation of the selectivity filter in, the cellular context, where the K+ ion concentration near the selectivity, filter varies in response to channel gating.
<StructureSection load='1k4d' size='340' side='right'caption='[[1k4d]], [[Resolution|resolution]] 2.30&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1k4d]] is a 3 chain structure with sequence from [https://en.wikipedia.org/wiki/Mus_musculus Mus musculus] and [https://en.wikipedia.org/wiki/Streptomyces_lividans Streptomyces lividans]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1K4D OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1K4D 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]] 2.3&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=DGA:DIACYL+GLYCEROL'>DGA</scene>, <scene name='pdbligand=F09:NONAN-1-OL'>F09</scene>, <scene name='pdbligand=K:POTASSIUM+ION'>K</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=1k4d FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1k4d OCA], [https://pdbe.org/1k4d PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1k4d RCSB], [https://www.ebi.ac.uk/pdbsum/1k4d PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1k4d ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/IGHG1_MOUSE IGHG1_MOUSE]
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
  <jmolCheckbox>
    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/k4/1k4d_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
    <text>to colour the structure by Evolutionary Conservation</text>
  </jmolCheckbox>
</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=1k4d ConSurf].
<div style="clear:both"></div>


==About this Structure==
==See Also==
1K4D is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Mus_musculus Mus musculus] and [http://en.wikipedia.org/wiki/Streptomyces_lividans Streptomyces lividans] with <scene name='pdbligand=K:'>K</scene>, <scene name='pdbligand=NA:'>NA</scene>, <scene name='pdbligand=DGA:'>DGA</scene> and <scene name='pdbligand=F09:'>F09</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1K4D OCA].
*[[Antibody 3D structures|Antibody 3D structures]]
 
*[[Potassium Channel|Potassium Channel]]
==Reference==
*[[Potassium channel 3D structures|Potassium channel 3D structures]]
Chemistry of ion coordination and hydration revealed by a K+ channel-Fab complex at 2.0 A resolution., Zhou Y, Morais-Cabral JH, Kaufman A, MacKinnon R, Nature. 2001 Nov 1;414(6859):43-8. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=11689936 11689936]
*[[3D structures of non-human antibody|3D structures of non-human antibody]]
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Mus musculus]]
[[Category: Mus musculus]]
[[Category: Single protein]]
[[Category: Streptomyces lividans]]
[[Category: Streptomyces lividans]]
[[Category: Kaufman, A.]]
[[Category: Kaufman A]]
[[Category: MacKinnon, R.]]
[[Category: MacKinnon R]]
[[Category: Morais-Cabral, J.H.]]
[[Category: Morais-Cabral JH]]
[[Category: Zhou, Y.]]
[[Category: Zhou Y]]
[[Category: DGA]]
[[Category: F09]]
[[Category: K]]
[[Category: NA]]
[[Category: k channel]]
[[Category: protein-antibody fab complex]]
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri Feb 15 16:11:21 2008''

Latest revision as of 10:57, 3 April 2024

Potassium Channel KcsA-Fab complex in low concentration of K+Potassium Channel KcsA-Fab complex in low concentration of K+

Structural highlights

1k4d is a 3 chain structure with sequence from Mus musculus and Streptomyces lividans. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:X-ray diffraction, Resolution 2.3Å
Ligands:, , ,
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

IGHG1_MOUSE

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

See Also

1k4d, resolution 2.30Å

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