View source for 7spx


==Crystal structure of photoactive yellow protein (PYP); F28oCNF construct==
<StructureSection load='7spx' size='340' side='right'caption='[[7spx]], [[Resolution|resolution]] 0.97&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[7spx]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Halorhodospira_halophila Halorhodospira halophila]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7SPX OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7SPX 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]] 0.97&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=9IJ:2-cyano-L-phenylalanine'>9IJ</scene>, <scene name='pdbligand=HC4:4-HYDROXYCINNAMIC+ACID'>HC4</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=7spx FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7spx OCA], [https://pdbe.org/7spx PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7spx RCSB], [https://www.ebi.ac.uk/pdbsum/7spx PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7spx 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.
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Nitriles are widely used vibrational probes; however, the interpretation of their IR frequencies is complicated by hydrogen bonding (H-bonding) in protic environments. We report a new vibrational Stark effect (VSE) that correlates the electric field projected on the -C identical withN bond to the transition dipole moment and, by extension, the nitrile peak area or integrated intensity. This linear VSE applies to both H-bonding and non-H-bonding interactions. It can therefore be generally applied to determine electric fields in all environments. Additionally, it allows for semiempirical extraction of the H-bonding contribution to the blueshift of the nitrile frequency. Nitriles were incorporated at H-bonding and non-H-bonding protein sites using amber suppression, and each nitrile variant was structurally characterized at high resolution. We exploited the combined information available from variations in frequency and integrated intensity and demonstrate that nitriles are a generally useful probe for electric fields.

Nitrile Infrared Intensities Characterize Electric Fields and Hydrogen Bonding in Protic, Aprotic, and Protein Environments.,Weaver JB, Kozuch J, Kirsh JM, Boxer SG J Am Chem Soc. 2022 May 4;144(17):7562-7567. doi: 10.1021/jacs.2c00675. Epub 2022, Apr 25. PMID:35467853<ref>PMID:35467853</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 7spx" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Halorhodospira halophila]]
[[Category: Large Structures]]
[[Category: Boxer SG]]
[[Category: Kirsh JM]]
[[Category: Weaver JB]]