intramolecular oxidoreductase activity, transposing C=C bonds polyenoic fatty acid isomerase activity https://github.com/geneontology/go-ontology/issues/30193 (5Z,8Z,11Z,14Z,17Z)-icosapentaenoate delta8,11-delta7,9-isomerase (trans-double-bond-forming) activity PFI KEGG_REACTION:R06502 EC:5.3.3.13 eicosapentaenoate cis-delta5,8,11,14,17-eicosapentaenoate cis-delta5-trans-delta7,9-cis-delta14,17 isomerase activity (5Z,8Z,11Z,14Z,17Z)-eicosapentaenoate delta8,11-delta7,8-isomerase activity RHEA:14889 molecular_function Catalysis of the reaction: all-cis-icosa-5,8,11,14,17-pentaenoate = (5Z,7E,9E,14Z,17Z)-icosapentaenoate. MetaCyc:5.3.3.13-RXN GO:0034016 (5Z,8Z,11Z,14Z,17Z)-eicosapentaenoate delta8,11-delta7,9-isomerase (trans-double-bond-forming) activity