View source for 1f55

==SOLUTION STRUCTURE OF THE CALCIUM BOUND N-TERMINAL DOMAIN OF YEAST CALMODULIN==
<StructureSection load='1f55' size='340' side='right' caption='[[1f55]], [[NMR_Ensembles_of_Models | 30 NMR models]]' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1f55]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Saccharomyces_cerevisiae Saccharomyces cerevisiae]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1F55 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1F55 FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</scene></td></tr>
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1f54|1f54]]</td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1f55 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1f55 OCA], [http://www.rcsb.org/pdb/explore.do?structureId=1f55 RCSB], [http://www.ebi.ac.uk/pdbsum/1f55 PDBsum]</span></td></tr>
</table>
== Function ==
[[http://www.uniprot.org/uniprot/CALM_YEAST CALM_YEAST]] Calmodulin mediates the control of a large number of enzymes, ion channels and other proteins by Ca(2+). Among the enzymes to be stimulated by the calmodulin-Ca(2+) complex are a number of protein kinases and phosphatases. Component of the spindle pole body (SPB) required for the proper execution of spindle pole body (SPB) duplication.<ref>PMID:10339566</ref>  
== 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/f5/1f55_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/chain_selection.php?pdb_ID=2ata ConSurf].
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
We have determined solution structures of the N-terminal half domain (N-domain) of yeast calmodulin (YCM0-N, residues 1-77) in the apo and Ca(2+)-saturated forms by NMR spectroscopy. The Ca(2+)-binding sites of YCM0-N consist of a pair of helix-loop-helix motifs (EF-hands), in which the loops are linked by a short beta-sheet. The binding of two Ca(2+) causes large rearrangement of the four alpha-helices and exposes the hydrophobic surface as observed for vertebrate calmodulin (CaM). Within the observed overall conformational similarity in the peptide backbone, several significant conformational differences were observed between the two proteins, which originated from the 38% disagreement in amino acid sequences. The beta-sheet in apo YCM0-N is strongly twisted compared with that in the N-domain of CaM, while it turns to the normal more stable conformation on Ca(2+) binding. YCM0-N shows higher cooperativity in Ca(2+) binding than the N-domain of CaM, and the observed conformational change of the beta-sheet is a possible cause of the highly cooperative Ca(2+) binding. The hydrophobic surface on Ca(2+)-saturated YCM0-N appears less flexible due to the replacements of Met51, Met71, and Val55 in the hydrophobic surface of CaM with Leu51, Leu71, and Ile55, which is thought to be one of reasons for the poor activation of target enzymes by yeast CaM.

Solution structures of the N-terminal domain of yeast calmodulin: Ca2+-dependent conformational change and its functional implication.,Ishida H, Takahashi K, Nakashima K, Kumaki Y, Nakata M, Hikichi K, Yazawa M Biochemistry. 2000 Nov 14;39(45):13660-8. PMID:11076504<ref>PMID:11076504</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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==See Also==
*[[Calmodulin|Calmodulin]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Saccharomyces cerevisiae]]
[[Category: Hikichi, K]]
[[Category: Ishida, H]]
[[Category: Kumaki, Y]]
[[Category: Nakashima, K]]
[[Category: Nakata, M]]
[[Category: Takahashi, K]]
[[Category: Yazawa, M]]
[[Category: Ef-hand]]
[[Category: Helix-loop-helix]]
[[Category: Transport protein]]