Guo, JinJinGuoHezaveh, SamiraSamiraHezavehTatur, JanaJanaTaturZeng, An-PingAn-PingZengJandt, UweUweJandt2019-08-302019-08-302016-12-16Biochemical Journal 5 (474): 865-875 (2017-03-01)http://hdl.handle.net/11420/3241The pyruvate dehydrogenase complex (PDC) plays a central role in cellular metabolism and regulation. As a metabolite-channeling multi-enzyme complex it acts as a complete nanomachine due to its unique geometry and by coupling a cascade of catalytic reactions using 'swinging arms'. Mammalian and specifically human PDC (hPDC) is assembled from multiple copies of E1 and E3 bound to a large E2/E3BP 60-meric core. A less restrictive and smaller catalytic core, which is still active, is highly desired for both fundamental research on channeling mechanisms and also to create a basis for further modification and engineering of new enzyme cascades. Here, we present the first experimental results of the successful disintegration of the E2/E3BP core while retaining its activity. This was achieved by C-terminal α-helixes double truncations (eight residues from E2 and seven residues from E3BP). Disintegration of the hPDC core via double truncations led to the formation of highly active (approximately 70% of wildtype) apparently unordered clusters or agglomerates and inactive non-agglomerated species (hexamer/ trimer). After additional deletion of N-terminal 'swinging arms', the aforementioned C-terminal truncations also caused the formation of agglomerates of minimized E2/E3BP complexes. It is likely that these 'swinging arm' regions are not solely responsible for the formation of the large agglomerates.en1470-872820165865875Portland PressBiowissenschaften, BiologieMedizinIngenieurwissenschaftenJournal Article10.1042/BCJ20160916Other