View source for 3bas


==Crystal structure of the N-terminal region of the scallop myosin rod, monoclinic (C2) form==
<StructureSection load='3bas' size='340' side='right'caption='[[3bas]], [[Resolution|resolution]] 2.30&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[3bas]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Argopecten_irradians Argopecten irradians] and [https://en.wikipedia.org/wiki/Saccharomyces_cerevisiae Saccharomyces cerevisiae]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3BAS OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3BAS 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=IOD:IODIDE+ION'>IOD</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=3bas FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3bas OCA], [https://pdbe.org/3bas PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3bas RCSB], [https://www.ebi.ac.uk/pdbsum/3bas PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3bas ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/GCN4_YEAST GCN4_YEAST] Is a transcription factor that is responsible for the activation of more than 30 genes required for amino acid or for purine biosynthesis in response to amino acid or purine starvation. Binds and recognize the DNA sequence: 5'-TGA[CG]TCA-3'.[https://www.uniprot.org/uniprot/MYS_ARGIR MYS_ARGIR] Muscle contraction.  Myosin is a protein that binds to F-actin and has ATPase activity that is activated by F-actin.
== 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/ba/3bas_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=3bas ConSurf].
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The N-terminal region of myosin's rod-like subfragment 2 (S2) joins the two heads of this dimeric molecule and is key to its function. Previously, a crystal structure of this predominantly coiled-coil region was determined for a short fragment (51 residues plus a leucine zipper) of the scallop striated muscle myosin isoform. In that study, the N-terminal 10-14 residues were found to be disordered. We have now determined the structure of the same scallop peptide in three additional crystal environments. In each of two of these structures, improved order has allowed visualization of the entire N-terminus in one chain of the dimeric peptide. We have also compared the melting temperatures of this scallop S2 peptide with those of analogous peptides from three other isoforms. Taken together, these experiments, along with examination of sequences, point to a diminished stability of the N-terminal region of S2 in regulated myosins, compared with those myosins whose regulation is thin filament linked. It seems plain that this isoform-specific instability promotes the off-state conformation of the heads in regulated myosins. We also discuss how myosin isoforms with varied thermal stabilities share the basic capacity to transmit force efficiently in order to produce contraction in their on states.

An unstable head-rod junction may promote folding into the compact off-state conformation of regulated myosins.,Brown JH, Yang Y, Reshetnikova L, Gourinath S, Suveges D, Kardos J, Hobor F, Reutzel R, Nyitray L, Cohen C J Mol Biol. 2008 Feb 1;375(5):1434-43. Epub 2007 Nov 28. PMID:18155233<ref>PMID:18155233</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 3bas" style="background-color:#fffaf0;"></div>

==See Also==
*[[Gcn4 3D Structures|Gcn4 3D Structures]]
*[[Gnc4 3D Structures|Gnc4 3D Structures]]
*[[Myosin 3D Structures|Myosin 3D Structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Argopecten irradians]]
[[Category: Large Structures]]
[[Category: Saccharomyces cerevisiae]]
[[Category: Brown JH]]
[[Category: Cohen C]]