oxidoreductase activity, acting on paired donors, with oxidation of a pair of donors resulting in the reduction of molecular oxygen to two molecules of water sn-2 acyl-lipid omega-3 desaturase (ferredoxin) activity https://github.com/geneontology/go-ontology/issues/28070 MetaCyc:RXN-8295 GO:0102993 EC:1.14.19.35 RHEA:46408 Catalysis of the reaction: a (9Z,12Z)-octadecadienoyl-containing glycerolipid + 2 H+ + O2 + 2 reduced [2Fe-2S]-[ferredoxin] = (9Z,12Z,15Z)-octadecatrienoyl-containing glycerolipid + 2 H2O + 2 oxidized [2Fe-2S]-[ferredoxin]. Also converts a (7Z,10Z)-hexadecadienoyl-containing glycerolipid into a (7Z,10Z,13Z)-hexadecatrienoyl-containing glycerolipid. RHEA:66516 RHEA:66512 MetaCyc:RXN-9667 MetaCyc:RXN-8314 MetaCyc:RXN-8310 MetaCyc:RXN-8299 MetaCyc:RXN-8297 linolenate delta15 desaturase activity MetaCyc:RXN-1727 Introduces a cis double bond at a location 3 carbons away from the methyl end of the fatty acid. Acts on all 16:2- or 18:2-containing chloroplast membrane lipids, including phosphatidylglycerol, monogalactosyldiacylglycerol, digalactosyldiaclyglycerol, and sulfoquinovosyldiacylglycerol. RHEA:66520 MetaCyc:RXN-8309 molecular_function RHEA:46412 MetaCyc:RXN-8303 MetaCyc:RXN-8301 MetaCyc:RXN-8366 MetaCyc:RXN-8365