View source for 1hjg


==Alteration of the co-substrate selectivity of deacetoxycephalosporin C synthase: The role of arginine-258==
<StructureSection load='1hjg' size='340' side='right'caption='[[1hjg]], [[Resolution|resolution]] 1.50&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1hjg]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Streptomyces_clavuligerus Streptomyces clavuligerus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1HJG OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1HJG 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]] 1.5&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=FE2:FE+(II)+ION'>FE2</scene>, <scene name='pdbligand=KIV:3-METHYL-2-OXOBUTANOIC+ACID'>KIV</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=1hjg FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1hjg OCA], [https://pdbe.org/1hjg PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1hjg RCSB], [https://www.ebi.ac.uk/pdbsum/1hjg PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1hjg ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/CEFE_STRCL CEFE_STRCL] Catalyzes the step from penicillin N to deacetoxy-cephalosporin C.
== 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/hj/1hjg_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=1hjg ConSurf].
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== Publication Abstract from PubMed ==
Deacetoxycephalosporin C synthase is an iron(II) 2-oxoglutaratedependent oxygenase that catalyzes the oxidative ring-expansion of penicillin N to deacetoxycephalosporin C. The wild-type enzyme is only able to efficiently utilize 2-oxoglutarate and 2-oxoadipate as a 2-oxoacid co-substrate. Mutation of arginine 258, the side chain of which forms an electrostatic interaction with the 5-carboxylate of the 2-oxoglutarate co-substrate, to a glutamine residue reduced activity to about 5% of the wild-type enzyme with 2-oxoglutarate. However, other aliphatic 2-oxoacids, which were not co-substrates for the wild-type enzyme, were utilized by the R258Q mutant. These 2-oxoacids "rescued" catalytic activity to the level observed for the wild-type enzyme as judged by penicillin N and G conversion. These co-substrates underwent oxidative decarboxylation as observed for 2-oxoglutarate in the normal reaction with the wild-type enzyme. Crystal structures of the iron(II)- 2-oxo-3-methylbutanoate (1.5 A), and iron(II)-2-oxo-4-methylpentanoate (1.6 A) enzyme complexes were obtained, which reveal the molecular basis for this "chemical co-substrate rescue" and help to rationalize the co-substrate selectivity of 2-oxoglutaratedependent oxygenases.

Alteration of the co-substrate selectivity of deacetoxycephalosporin C synthase. The role of arginine 258.,Lee HJ, Lloyd MD, Clifton IJ, Harlos K, Dubus A, Baldwin JE, Frere JM, Schofield CJ J Biol Chem. 2001 May 25;276(21):18290-5. Epub 2001 Feb 21. PMID:11279000<ref>PMID:11279000</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 1hjg" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Streptomyces clavuligerus]]
[[Category: Baldwin JE]]
[[Category: Clifton IJ]]
[[Category: Dubus A]]
[[Category: Frere JM]]
[[Category: Harlos K]]
[[Category: Lee HJ]]
[[Category: Lloyd MD]]
[[Category: Schofield CJ]]