4bb3: Difference between revisions
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==Isopenicillin N synthase with the dipeptide substrate analogue AhC== | ==Isopenicillin N synthase with the dipeptide substrate analogue AhC== | ||
<StructureSection load='4bb3' size='340' side='right' caption='[[4bb3]], [[Resolution|resolution]] 1.40Å' scene=''> | <StructureSection load='4bb3' size='340' side='right' caption='[[4bb3]], [[Resolution|resolution]] 1.40Å' scene=''> | ||
== Structural highlights == | == Structural highlights == | ||
<table><tr><td colspan='2'>[[4bb3]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/ | <table><tr><td colspan='2'>[[4bb3]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Aspergillus_nidulans Aspergillus nidulans]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4BB3 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4BB3 FirstGlance]. <br> | ||
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=FE:FE+(III)+ION'>FE</scene>, <scene name='pdbligand=KKA:(2S)-2-AZANYL-6-OXIDANYLIDENE-6-[[(2S)-1-OXIDANYL-1-OXIDANYLIDENE-4-SULFANYL-BUTAN-2-YL]AMINO]HEXANOIC+ACID'>KKA</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr> | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=FE:FE+(III)+ION'>FE</scene>, <scene name='pdbligand=KKA:(2S)-2-AZANYL-6-OXIDANYLIDENE-6-[[(2S)-1-OXIDANYL-1-OXIDANYLIDENE-4-SULFANYL-BUTAN-2-YL]AMINO]HEXANOIC+ACID'>KKA</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr> | ||
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Isopenicillin-N_synthase Isopenicillin-N synthase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.21.3.1 1.21.3.1] </span></td></tr> | <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Isopenicillin-N_synthase Isopenicillin-N synthase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.21.3.1 1.21.3.1] </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=4bb3 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4bb3 OCA], [http://www.rcsb.org/pdb/explore.do?structureId=4bb3 RCSB], [http://www.ebi.ac.uk/pdbsum/4bb3 PDBsum]</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=4bb3 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4bb3 OCA], [http://pdbe.org/4bb3 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=4bb3 RCSB], [http://www.ebi.ac.uk/pdbsum/4bb3 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=4bb3 ProSAT]</span></td></tr> | ||
</table> | </table> | ||
== Function == | == Function == | ||
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | ||
</div> | </div> | ||
<div class="pdbe-citations 4bb3" style="background-color:#fffaf0;"></div> | |||
==See Also== | |||
*[[Isopenicillin N synthase|Isopenicillin N synthase]] | |||
== References == | == References == | ||
<references/> | <references/> | ||
__TOC__ | __TOC__ | ||
</StructureSection> | </StructureSection> | ||
[[Category: Aspergillus nidulans | [[Category: Aspergillus nidulans]] | ||
[[Category: Isopenicillin-N synthase]] | [[Category: Isopenicillin-N synthase]] | ||
[[Category: Clifton, I J]] | [[Category: Clifton, I J]] | ||
Revision as of 21:30, 4 August 2016
Isopenicillin N synthase with the dipeptide substrate analogue AhCIsopenicillin N synthase with the dipeptide substrate analogue AhC
Structural highlights
Function[IPNS_EMENI] Removes, in the presence of oxygen, 4 hydrogen atoms from delta-L-(alpha-aminoadipyl)-L-cysteinyl-D-valine (ACV) to form the azetidinone and thiazolidine rings of isopenicillin. Publication Abstract from PubMedIsopenicillin N synthase (IPNS) converts its linear tripeptide substrate delta-L-alpha-aminoadipoyl-L-cysteinyl-D-valine (ACV) to bicyclic isopenicillin N (IPN), the key step in penicillin biosynthesis. Solution-phase incubation experiments have shown that IPNS will accept and oxidise a diverse array of substrate analogues, including tripeptides that incorporate L-homocysteine as their second residue, and tripeptides with truncated side-chains at the third amino acid such as delta-L-alpha-aminoadipoyl-L-cysteinyl-D-alpha-aminobutyrate (ACAb), delta-L-alpha-aminoadipoyl-L-cysteinyl-D-alanine (ACA) and delta-L-alpha-aminoadipoyl-L-cysteinyl-glycine (ACG). However IPNS does not react with dipeptide substrates. To probe this selectivity we have crystallised the enzyme with the dipeptide delta-L-alpha-aminoadipoyl-L-homocysteine (AhC) and solved a crystal structure for the IPNS:Fe(II):AhC complex to 1.40 A resolution. This structure reveals an unexpected mode of peptide binding at the IPNS active site, in which the homocysteinyl thiolate does not bind to iron. Instead the primary mode of binding sees the homocysteinyl carboxylate coordinated to the metal, while its side-chain is oriented into the region of the active site normally occupied by the benzyl group of protein residue Phe211. The crystal structure of isopenicillin N synthase with a dipeptide substrate analogue.,Daruzzaman A, Clifton IJ, Adlington RM, Baldwin JE, Rutledge PJ Arch Biochem Biophys. 2013 Feb 1;530(1):48-53. doi: 10.1016/j.abb.2012.12.012., Epub 2012 Dec 19. PMID:23262315[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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