5fhi

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== Function ==
== Function ==
[https://www.uniprot.org/uniprot/PSOE_ASPFU PSOE_ASPFU] Glutathione S-transferase; part of the gene cluster that mediates the biosynthesis of pseurotin A, a competitive inhibitor of chitin synthase and an inducer of nerve-cell proliferation (PubMed:24082142, PubMed:24939566). The PKS-NRPS hybrid synthetase psoA is responsible for the biosynthesis of azaspirene, one of the first intermediates having the 1-oxa-7-azaspiro[4,4]-non-2-ene-4,6-dione core of pseurotin, via condensation of one acetyl-CoA, 4 malonyl-CoA, and a L-phenylalanine molecule (PubMed:24082142, PubMed:24939566). The dual-functional monooxygenase/methyltransferase psoF seems to be involved in the addition of the C3 methyl group onto the pseurotin scaffold (PubMed:24939566). Azaspirene is then converted to synerazol through 4 steps including oxidation of C17 by the cytochrome P450 monooxygenase psoD, O-methylation of the hydroxy group of C8 by the methyltransferase psoC, and the trans-to-cis isomerization of the C13 olefin by the glutathione S-transferase psoE (PubMed:24939566, PubMed:27072782). The fourth step of synerazol production is performed by the dual-functional monooxygenase/methyltransferase psoF which seems to catalyze the epoxidation of the intermediate deepoxy-synerazol (PubMed:24939566). Synerazol can be attacked by a water molecule nonenzymatically at two different positions to yield two diol products, pseurotin A and pseurotin D (PubMed:24939566).<ref>PMID:24082142</ref> <ref>PMID:24939566</ref> <ref>PMID:27072782</ref>
[https://www.uniprot.org/uniprot/PSOE_ASPFU PSOE_ASPFU] Glutathione S-transferase; part of the gene cluster that mediates the biosynthesis of pseurotin A, a competitive inhibitor of chitin synthase and an inducer of nerve-cell proliferation (PubMed:24082142, PubMed:24939566). The PKS-NRPS hybrid synthetase psoA is responsible for the biosynthesis of azaspirene, one of the first intermediates having the 1-oxa-7-azaspiro[4,4]-non-2-ene-4,6-dione core of pseurotin, via condensation of one acetyl-CoA, 4 malonyl-CoA, and a L-phenylalanine molecule (PubMed:24082142, PubMed:24939566). The dual-functional monooxygenase/methyltransferase psoF seems to be involved in the addition of the C3 methyl group onto the pseurotin scaffold (PubMed:24939566). Azaspirene is then converted to synerazol through 4 steps including oxidation of C17 by the cytochrome P450 monooxygenase psoD, O-methylation of the hydroxy group of C8 by the methyltransferase psoC, and the trans-to-cis isomerization of the C13 olefin by the glutathione S-transferase psoE (PubMed:24939566, PubMed:27072782). The fourth step of synerazol production is performed by the dual-functional monooxygenase/methyltransferase psoF which seems to catalyze the epoxidation of the intermediate deepoxy-synerazol (PubMed:24939566). Synerazol can be attacked by a water molecule nonenzymatically at two different positions to yield two diol products, pseurotin A and pseurotin D (PubMed:24939566).<ref>PMID:24082142</ref> <ref>PMID:24939566</ref> <ref>PMID:27072782</ref>
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== Publication Abstract from PubMed ==
 
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Geometric isomerization can expand the scope of biological activities of natural products. The observed chemical diversity among the pseurotin-type fungal secondary metabolites is in part generated by a trans to cis isomerization of an olefin. In vitro characterizations of pseurotin biosynthetic enzymes revealed that the glutathione S-transferase PsoE requires participation of the bifunctional C-methyltransferase/epoxidase PsoF to complete the trans to cis isomerization of the pathway intermediate presynerazol. The crystal structure of the PsoE/glutathione/presynerazol complex indicated stereospecific glutathione-presynerazol conjugate formation is the principal function of PsoE. Moreover, PsoF was identified to have an additional, unexpected oxidative isomerase activity, thus making it a trifunctional enzyme which is key to the complexity generation in pseurotin biosynthesis. Through the study, we identified a novel mechanism of accomplishing a seemingly simple trans to cis isomerization reaction.
 
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Oxidative trans to cis Isomerization of Olefins in Polyketide Biosynthesis.,Yamamoto T, Tsunematsu Y, Hara K, Suzuki T, Kishimoto S, Kawagishi H, Noguchi H, Hashimoto H, Tang Y, Hotta K, Watanabe K Angew Chem Int Ed Engl. 2016 May 17;55(21):6207-10. doi: 10.1002/anie.201600940. , Epub 2016 Apr 13. PMID:27072782<ref>PMID:27072782</ref>
 
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
 
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== References ==
== References ==
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Current revision

Crystallographic structure of PsoE without Co

PDB ID 5fhi

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