Predicted to enable isocitrate dehydrogenase (NAD+) activity. Predicted to be involved in isocitrate metabolic process and tricarboxylic acid cycle. Predicted to be part of isocitrate dehydrogenase complex (NAD+). Predicted to be active in mitochondrial matrix. Is expressed in several structures, including Malpighian tubule primordium; adult head; dorsal ectoderm; dorsal ectoderm anlage; and embryonic/larval midgut primordium.