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[[Image:1gk0.gif|left|200px]]
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{{STRUCTURE_1gk0|  PDB=1gk0  |  SCENE=  }}
'''STRUCTURE-BASED PREDICTION OF MODIFICATIONS IN GLUTARYLAMIDASE TO ALLOW SINGLE-STEP ENZYMATIC PRODUCTION OF 7-AMINOCEPHALOSPORANIC ACID FROM CEPHALOSPORIN C'''


==Structure-based prediction of modifications in glutarylamidase to allow single-step enzymatic production of 7-aminocephalosporanic acid from cephalosporin C==
<StructureSection load='1gk0' size='340' side='right'caption='[[1gk0]], [[Resolution|resolution]] 2.50&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1gk0]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Pseudomonas_sp. Pseudomonas sp.]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1GK0 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1GK0 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]] 2.5&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=EDO:1,2-ETHANEDIOL'>EDO</scene>, <scene name='pdbligand=MSE:SELENOMETHIONINE'>MSE</scene>, <scene name='pdbligand=PO4:PHOSPHATE+ION'>PO4</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=1gk0 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1gk0 OCA], [https://pdbe.org/1gk0 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1gk0 RCSB], [https://www.ebi.ac.uk/pdbsum/1gk0 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1gk0 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/G7AC_PSEU7 G7AC_PSEU7] Catalyzes the deacylation of 7 beta-(4-carboxybutanamido)cephalosporanic acid (glutaryl-7-aminocephalosporanic acid or GL-7-ACA) to 7-aminocephalosporanic acid (7-ACA).<ref>PMID:2993240</ref>
== 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/gk/1gk0_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=1gk0 ConSurf].
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Glutarylamidase is an important enzyme employed in the commercial production of 7-aminocephalosporanic acid, a starting compound in the synthesis of cephalosporin antibiotics. 7-aminocephalosporanic acid is obtained from cephalosporin C, a natural antibiotic, either chemically or by a two-step enzymatic process utilizing the enzymes D-amino acid oxidase and glutarylamidase. We have investigated possibilities for redesigning glutarylamidase for the production of 7-aminocephalosporanic acid from cephalosporin C in a single enzymatic step. These studies are based on the structures of glutarylamidase, which we have solved with bound phosphate and ethylene glycol to 2.5 A resolution and with bound glycerol to 2.4 A. The phosphate binds near the catalytic serine in a way that mimics the hemiacetal that develops during catalysis, while the glycerol occupies the side-chain binding pocket. Our structures show that the enzyme is not only structurally similar to penicillin G acylase but also employs essentially the same mechanism in which the alpha-amino group of the catalytic serine acts as a base. A subtle difference is the presence of two catalytic dyads, His B23/Glu B455 and His B23/Ser B1, that are not seen in penicillin G acylase. In contrast to classical serine proteases, the central histidine of these dyads interacts indirectly with the O(gamma) through a hydrogen bond relay network involving the alpha-amino group of the serine and a bound water molecule. A plausible model of the enzyme-substrate complex is proposed that leads to the prediction of mutants of glutarylamidase that should enable the enzyme to deacylate cephalosporin C into 7-aminocephalosporanic acid.


==Overview==
Structure-based prediction of modifications in glutarylamidase to allow single-step enzymatic production of 7-aminocephalosporanic acid from cephalosporin C.,Fritz-Wolf K, Koller KP, Lange G, Liesum A, Sauber K, Schreuder H, Aretz W, Kabsch W Protein Sci. 2002 Jan;11(1):92-103. PMID:11742126<ref>PMID:11742126</ref>
Glutarylamidase is an important enzyme employed in the commercial production of 7-aminocephalosporanic acid, a starting compound in the synthesis of cephalosporin antibiotics. 7-aminocephalosporanic acid is obtained from cephalosporin C, a natural antibiotic, either chemically or by a two-step enzymatic process utilizing the enzymes D-amino acid oxidase and glutarylamidase. We have investigated possibilities for redesigning glutarylamidase for the production of 7-aminocephalosporanic acid from cephalosporin C in a single enzymatic step. These studies are based on the structures of glutarylamidase, which we have solved with bound phosphate and ethylene glycol to 2.5 A resolution and with bound glycerol to 2.4 A. The phosphate binds near the catalytic serine in a way that mimics the hemiacetal that develops during catalysis, while the glycerol occupies the side-chain binding pocket. Our structures show that the enzyme is not only structurally similar to penicillin G acylase but also employs essentially the same mechanism in which the alpha-amino group of the catalytic serine acts as a base. A subtle difference is the presence of two catalytic dyads, His B23/Glu B455 and His B23/Ser B1, that are not seen in penicillin G acylase. In contrast to classical serine proteases, the central histidine of these dyads interacts indirectly with the O(gamma) through a hydrogen bond relay network involving the alpha-amino group of the serine and a bound water molecule. A plausible model of the enzyme-substrate complex is proposed that leads to the prediction of mutants of glutarylamidase that should enable the enzyme to deacylate cephalosporin C into 7-aminocephalosporanic acid.


==About this Structure==
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
1GK0 is a [[Protein complex]] structure of sequences from [http://en.wikipedia.org/wiki/Pseudomonas_sp. Pseudomonas sp.]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1GK0 OCA].
</div>
<div class="pdbe-citations 1gk0" style="background-color:#fffaf0;"></div>


==Reference==
==See Also==
Structure-based prediction of modifications in glutarylamidase to allow single-step enzymatic production of 7-aminocephalosporanic acid from cephalosporin C., Fritz-Wolf K, Koller KP, Lange G, Liesum A, Sauber K, Schreuder H, Aretz W, Kabsch W, Protein Sci. 2002 Jan;11(1):92-103. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/11742126 11742126]
*[[Cephalosporin acylase 3D structures|Cephalosporin acylase 3D structures]]
[[Category: Penicillin amidase]]
== References ==
[[Category: Protein complex]]
<references/>
[[Category: Pseudomonas sp.]]
__TOC__
[[Category: Aretz, W.]]
</StructureSection>
[[Category: Fritz-Wolf, K.]]
[[Category: Large Structures]]
[[Category: Kabsch, W.]]
[[Category: Pseudomonas sp]]
[[Category: Koller, K P.]]
[[Category: Aretz W]]
[[Category: Lange, G.]]
[[Category: Fritz-Wolf K]]
[[Category: Liesum, A.]]
[[Category: Kabsch W]]
[[Category: Sauber, K.]]
[[Category: Koller KP]]
[[Category: Schreuder, H.]]
[[Category: Lange G]]
[[Category: Catalytic triad]]
[[Category: Liesum A]]
[[Category: Cephalosporin acylase]]
[[Category: Sauber K]]
[[Category: Cephalosporin c]]
[[Category: Schreuder H]]
[[Category: Glutaryl acylase]]
[[Category: Ntn-hydrolase]]
[[Category: X-raz structure]]
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