View source for 3zoi


==ISOPENICILLIN N SYNTHASE WITH AC-O-METHYL-D-THREONINE==
<StructureSection load='3zoi' size='340' side='right'caption='[[3zoi]], [[Resolution|resolution]] 1.82&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[3zoi]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Aspergillus_nidulans Aspergillus nidulans]. This structure supersedes the now removed PDB entry [http://oca.weizmann.ac.il/oca-bin/send-pdb?obs=1&id=2y86 2y86]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3ZOI OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3ZOI 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]] 1.82&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=FE:FE+(III)+ION'>FE</scene>, <scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=M2W:DELTA-(L-ALPHA-AMINOADIPOYL)-L-CYSTEINYL-O-METHYL-D-THREONINE'>M2W</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=3zoi FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3zoi OCA], [https://pdbe.org/3zoi PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3zoi RCSB], [https://www.ebi.ac.uk/pdbsum/3zoi PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3zoi ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/IPNA_EMENI IPNA_EMENI] Isopenicillin N synthase; part of the gene cluster that mediates the biosynthesis of penicillin, the world's most important antibiotic (PubMed:3319778, PubMed:11755401). IpnA catalyzes the cyclization of the tripeptide N-[(5S)-5-amino-5-carboxypentanoyl]-L-cysteinyl-D-valine (LLD-ACV or ACV) to form isopenicillin N (IPN) that contains the beta-lactam nucleus (PubMed:3319778, PubMed:11755401, PubMed:28703303). The penicillin biosynthesis occurs via 3 enzymatic steps, the first corresponding to the production of the tripeptide N-[(5S)-5-amino-5-carboxypentanoyl]-L-cysteinyl-D-valine (LLD-ACV or ACV) by the NRPS acvA. The tripeptide ACV is then cyclized to isopenicillin N (IPN) by the isopenicillin N synthase ipnA that forms the beta-lactam nucleus. Finally, the alpha-aminoadipyl side chain is exchanged for phenylacetic acid by the isopenicillin N acyltransferase penDE to yield penicillin in the peroxisomal matrix (By similarity).[UniProtKB:P08703]<ref>PMID:11755401</ref> <ref>PMID:28703303</ref> <ref>PMID:3319778</ref> 
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== Publication Abstract from PubMed ==
Isopenicillin N synthase (IPNS) is a non-heme iron oxidase central to the biosynthesis of beta-lactam antibiotics. IPNS converts the tripeptide delta-(L-alpha-aminoadipoyl)-L-cysteinyl-D-valine (ACV) to isopenicillin N while reducing molecular oxygen to water. The substrate analogue delta-(L-alpha-aminoadipoyl)-L-cysteinyl-O-methyl-D-threonine (ACmT) is not turned over by IPNS. Epimeric delta-(L-alpha-aminoadipoyl)-L-cysteinyl-O-methyl-D-allo-threonine (ACmaT) is converted to a bioactive penam product. ACmT and ACmaT differ from each other only in the stereochemistry at the beta-carbon atom of their third residue. These substrates both contain a methyl ether in place of the isopropyl group of ACV. We report an X-ray crystal structure for the anaerobic IPNS:Fe(II):ACmT complex. This structure reveals an additional water molecule bound to the active site metal, held by hydrogen-bonding to the ether oxygen atom of the substrate analogue.

The crystal structure of an isopenicillin N synthase complex with an ethereal substrate analogue reveals water in the oxygen binding site.,Clifton IJ, Ge W, Adlington RM, Baldwin JE, Rutledge PJ FEBS Lett. 2013 Aug 19;587(16):2705-9. doi: 10.1016/j.febslet.2013.07.016. Epub, 2013 Jul 13. PMID:23860486<ref>PMID:23860486</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 3zoi" style="background-color:#fffaf0;"></div>

==See Also==
*[[Isopenicillin N synthase|Isopenicillin N synthase]]
== References ==
<references/>
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</StructureSection>
[[Category: Aspergillus nidulans]]
[[Category: Large Structures]]
[[Category: Clifton IJ]]
[[Category: Ge W]]
[[Category: Rutledge PJ]]