View source for 3or0


==Semi-synthetic ribonuclease S: cyanylated homocysteine at position 13==
<StructureSection load='3or0' size='340' side='right' caption='[[3or0]], [[Resolution|resolution]] 2.30&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[3or0]] is a 4 chain structure with sequence from [http://en.wikipedia.org/wiki/Bos_taurus Bos taurus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3OR0 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3OR0 FirstGlance]. <br>
</td></tr><tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=4CY:NITRILO-L-METHIONINE'>4CY</scene></td></tr>
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[3oqy|3oqy]], [[3oqz|3oqz]]</td></tr>
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Pancreatic_ribonuclease Pancreatic ribonuclease], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.1.27.5 3.1.27.5] </span></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=3or0 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3or0 OCA], [http://pdbe.org/3or0 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=3or0 RCSB], [http://www.ebi.ac.uk/pdbsum/3or0 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=3or0 ProSAT]</span></td></tr>
</table>
== Function ==
[[http://www.uniprot.org/uniprot/RNAS1_BOVIN RNAS1_BOVIN]] Endonuclease that catalyzes the cleavage of RNA on the 3' side of pyrimidine nucleotides. Acts on single stranded and double stranded RNA.<ref>PMID:7479688</ref>  
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Three different nitrile-containing amino acids, p-cyanophenylalanine, m-cyanophenylalanine, and S-cyanohomocysteine, have been introduced near the active site of the semisynthetic enzyme ribonuclease S (RNase S) to serve as probes of electrostatic fields. Vibrational Stark spectra, measured directly on the probe-modified proteins, confirm the predominance of the linear Stark tuning rate in describing the sensitivity of the nitrile stretch to external electric fields, a necessary property for interpreting observed frequency shifts as a quantitative measure of local electric fields that can be compared with simulations. The X-ray structures of these nitrile-modified RNase variants and enzymatic assays demonstrate minimal perturbation to the structure and function, respectively, by the probes and provide a context for understanding the influence of the environment on the nitrile stretching frequency. We examine the ability of simulation techniques to recapitulate the spectroscopic properties of these nitriles as a means to directly test a computational electrostatic model for proteins, specifically that in the ubiquitous Amber-99 force field. Although qualitative agreement between theory and experiment is observed for the largest shifts, substantial discrepancies are observed in some cases, highlighting the ongoing need for experimental metrics to inform the development of theoretical models of electrostatic fields in proteins.

Nitrile Bonds as Infrared Probes of Electrostatics in Ribonuclease S.,Fafarman AT, Boxer SG J Phys Chem B. 2010 Sep 30. PMID:20883003<ref>PMID:20883003</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 3or0" style="background-color:#fffaf0;"></div>

==See Also==
*[[Ribonuclease|Ribonuclease]]
*[[Temp|Temp]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Bos taurus]]
[[Category: Pancreatic ribonuclease]]
[[Category: Boxer, S G]]
[[Category: Fafarman, A T]]
[[Category: Artificial]]
[[Category: Cyano]]
[[Category: Hydrolase]]
[[Category: Nitrile]]
[[Category: Non-natural]]
[[Category: Probe]]
[[Category: Thiocyanate]]
[[Category: Vibrational]]