A total of 338 new targets were identified and from these we validated glycogen synthase kinase 3β (Gsk3β), which can phosphorylate α-synuclein, and translocase of outer mitochondrial membrane 20 (Tomm20), a mitochondrial translocase that, when ubiquitinated, promotes mitophagy, as SCFFbxo7substrates both in vitro and in vivo Ubiquitin chain restriction analyses revealed that Fbxo7 modified Gsk3β using K63 linkages.