Involved in storage lipid mobilization during the growth of higher plant seedling. D-threo-isocitrate = glyoxylate + succinate Carbohydrate metabolism; glyoxylate cycle; (S)-malate from isocitrate: step 1/2. Homotetramer. Expressed from 1 to 3 days after seed imbibition (PubMed:10805817). Expressed from 1 to 5 days after seed imbibition (at protein level). No visible phenotype under normal growth conditions, but mutant seedlings fail to establish into plantlets with true leaves under low light or short day conditions. Belongs to the isocitrate lyase/PEP mutase superfamily. Isocitrate lyase family.