View source for 1uwn


==The Initial Events in the Photocycle of Photoactive Yellow Protein: A Common Mechanism on Light Activation in Photoreceptor Proteins==
<StructureSection load='1uwn' size='340' side='right'caption='[[1uwn]], [[Resolution|resolution]] 1.20&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1uwn]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Halorhodospira_halophila Halorhodospira halophila]. The March 2015 RCSB PDB [https://pdb.rcsb.org/pdb/static.do?p=education_discussion/molecule_of_the_month/index.html Molecule of the Month] feature on ''Phototropin''  by David Goodsell is [https://dx.doi.org/10.2210/rcsb_pdb/mom_2015_3 10.2210/rcsb_pdb/mom_2015_3]. The March 2016 RCSB PDB [https://pdb.rcsb.org/pdb/static.do?p=education_discussion/molecule_of_the_month/index.html Molecule of the Month] feature on ''Raf Protein Kinases''  by David Goodsell is [https://dx.doi.org/10.2210/rcsb_pdb/mom_2016_3 10.2210/rcsb_pdb/mom_2016_3]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1UWN OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1UWN 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]] 1.2&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=HC4:4-HYDROXYCINNAMIC+ACID'>HC4</scene>, <scene name='pdbligand=MSE:SELENOMETHIONINE'>MSE</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</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=1uwn FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1uwn OCA], [https://pdbe.org/1uwn PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1uwn RCSB], [https://www.ebi.ac.uk/pdbsum/1uwn PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1uwn ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/PYP_HALHA PYP_HALHA] Photoactive blue light protein. Probably functions as a photoreceptor for a negative phototaxis response.
== 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/uw/1uwn_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview03.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=1uwn ConSurf].
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The light-induced isomerization of a double bond is the key event that allows the conversion of light energy into a structural change in photoactive proteins for many light-mediated biological processes, such as vision, photosynthesis, photomorphogenesis, and photo movement. Cofactors such as retinals, linear tetrapyrroles, and 4-hydroxy-cinnamic acid have been selected by nature that provide the essential double bond to transduce the light signal into a conformational change and eventually, a physiological response. Here we report the first events after light excitation of the latter chromophore, containing a single ethylene double bond, in a low temperature crystallographic study of the photoactive yellow protein. We measured experimental phases to overcome possible model bias, corrected for minimized radiation damage, and measured absorption spectra of crystals to analyze the photoproducts formed. The data show a mechanism for the light activation of photoactive yellow protein, where the energy to drive the remainder of the conformational changes is stored in a slightly strained but fully cis-chromophore configuration. In addition, our data indicate a role for backbone rearrangements during the very early structural events.

Initial events in the photocycle of photoactive yellow protein.,Kort R, Hellingwerf KJ, Ravelli RB J Biol Chem. 2004 Jun 18;279(25):26417-24. Epub 2004 Mar 16. PMID:15026418<ref>PMID:15026418</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 1uwn" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Halorhodospira halophila]]
[[Category: Large Structures]]
[[Category: Phototropin]]
[[Category: RCSB PDB Molecule of the Month]]
[[Category: Raf Protein Kinases]]
[[Category: Hellingwerf KJ]]
[[Category: Kort R]]
[[Category: Ravelli RBG]]