View source for 2fcq

==X-ray Crystal Structure of a Chemically Synthesized Ubiquitin with a Cubic Space Group==
<StructureSection load='2fcq' size='340' side='right' caption='[[2fcq]], [[Resolution|resolution]] 3.30&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[2fcq]] is a 2 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2FCQ OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2FCQ FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=CD:CADMIUM+ION'>CD</scene></td></tr>
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1yiw|1yiw]], [[1yj1|1yj1]], [[2fcm|2fcm]], [[2fcn|2fcn]], [[2fcs|2fcs]]</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=2fcq FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2fcq OCA], [http://pdbe.org/2fcq PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2fcq RCSB], [http://www.ebi.ac.uk/pdbsum/2fcq PDBsum]</span></td></tr>
</table>
== 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/fc/2fcq_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=2fcq ConSurf].
<div style="clear:both"></div>
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== Publication Abstract from PubMed ==
The alpha-helix is a fundamental protein structural motif and is frequently terminated by a glycine residue. Explanations for the predominance of glycine at the C-cap terminal portions of alpha-helices have invoked uniquely favorable energetics of this residue in a left-handed conformation or enhanced solvation of the peptide backbone because of the absence of a side chain. Attempts to quantify the contributions of these two effects have been made previously, but the issue remains unresolved. Here we have used chemical protein synthesis to dissect the energetic basis of alpha-helix termination by comparing a series of ubiquitin variants containing an L-amino acid or the corresponding D-amino acid at the C-cap Gly35 position. D-Amino acids can adopt a left-handed conformation without energetic penalty, so the contributions of conformational strain and backbone solvation can thus be separated. Analysis of the thermodynamic data revealed that the preference for glycine at the C' position of a helix is predominantly a conformational effect.

Dissecting the energetics of protein alpha-helix C-cap termination through chemical protein synthesis.,Bang D, Gribenko AV, Tereshko V, Kossiakoff AA, Kent SB, Makhatadze GI Nat Chem Biol. 2006 Mar;2(3):139-43. Epub 2006 Jan 30. PMID:16446709<ref>PMID:16446709</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 2fcq" style="background-color:#fffaf0;"></div>

==See Also==
*[[Ubiquitin|Ubiquitin]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Bang, D]]
[[Category: Gribenko, A V]]
[[Category: Kent, S B]]
[[Category: Kossiakoff, A A]]
[[Category: Makhatadze, G I]]
[[Category: Tereshko, V]]
[[Category: Structural protein]]
[[Category: Ubiquitin]]