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New page: left|200px<br /> <applet load="1bkr" size="450" color="white" frame="true" align="right" spinBox="true" caption="1bkr, resolution 1.10Å" /> '''CALPONIN HOMOLOGY (...
 
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[[Image:1bkr.gif|left|200px]]<br />
<applet load="1bkr" size="450" color="white" frame="true" align="right" spinBox="true"
caption="1bkr, resolution 1.10&Aring;" />
'''CALPONIN HOMOLOGY (CH) DOMAIN FROM HUMAN BETA-SPECTRIN AT 1.1 ANGSTROM RESOLUTION'''<br />


==Overview==
==CALPONIN HOMOLOGY (CH) DOMAIN FROM HUMAN BETA-SPECTRIN AT 1.1 ANGSTROM RESOLUTION==
BACKGROUND: The actin-binding site of several cytoskeletal proteins is, comprised of two calponin homology (CH) domains in a tandem arrangement., As a single copy, the CH domain is also found in regulatory proteins in, muscle and in signal-transduction proteins. The three-dimensional, structures of three CH domains are known, but they have not yet clarified, the molecular details of the interaction between actin filaments and, proteins harbouring CH domains. RESULTS: We have compared the crystal, structure of a CH domain from beta-spectrin, which has been refined to 1.1, A resolution, with the two CH domains that constitute the actin-binding, region of fimbrin. This analysis has allowed the construction of a, structure-based sequence alignment of CH domains that can be used in, further comparisons of members of the CH domain family. The study has also, improved our understanding of the factors that determine domain, architecture, and has led to discussion on the functional differences that, seem to exist between subfamilies of CH domains, as regards binding to, F-actin. CONCLUSIONS: Our analysis supports biochemical data that, implicate a surface centered at the last helix of the N-terminal CH domain, as the most probable actin-binding site in cytoskeletal proteins. It is, not clear whether the C-terminal domains of the tandem arrangement or the, single CH domains have this function alone. This may imply that although, the CH domains are homologous and have a conserved structure, they may, have evolved to perform different functions.
<StructureSection load='1bkr' size='340' side='right'caption='[[1bkr]], [[Resolution|resolution]] 1.10&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1bkr]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1BKR OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1BKR 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]] 1.1&#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=1bkr FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1bkr OCA], [https://pdbe.org/1bkr PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1bkr RCSB], [https://www.ebi.ac.uk/pdbsum/1bkr PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1bkr ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/SPTB2_HUMAN SPTB2_HUMAN] Fodrin, which seems to be involved in secretion, interacts with calmodulin in a calcium-dependent manner and is thus candidate for the calcium-dependent movement of the cytoskeleton at the membrane.
== 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/bk/1bkr_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=1bkr ConSurf].
<div style="clear:both"></div>


==About this Structure==
==See Also==
1BKR is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=1BKR OCA].
*[[Spectrin 3D structures|Spectrin 3D structures]]
 
__TOC__
==Reference==
</StructureSection>
Structural comparisons of calponin homology domains: implications for actin binding., Banuelos S, Saraste M, Carugo KD, Structure. 1998 Nov 15;6(11):1419-31. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=9817844 9817844]
[[Category: Homo sapiens]]
[[Category: Homo sapiens]]
[[Category: Single protein]]
[[Category: Large Structures]]
[[Category: Banuelos, S.]]
[[Category: Banuelos S]]
[[Category: Carugo, K.Djinovic.]]
[[Category: Djinovic Carugo K]]
[[Category: Saraste, M.]]
[[Category: Saraste M]]
[[Category: cytoskeleton]]
[[Category: filamentous actin-binding domain]]
 
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