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- W2590703204 abstract "The human pyruvate dehydrogenase complex (PDC) comprises four multidomain components, E1, E3, E2 and an E3-binding protein (E3BP), the latter two forming the core as E2·E3BP sub-complex. Pyruvate flux through PDC is regulated via phosphorylation (inactivation) at E1 by four PDC kinases (PDKs), and reactivation by two PDC phosphatases. Up-regulation of PDK isoform gene expression is reported in several forms of cancer, while PDKs may be further activated by PDC by binding to the E2·E3BP core. Hence, the PDK: E2·E3BP interaction provides new therapeutic targets. We carried out both functional kinetic and thermodynamic studies to demonstrate significant differences in the activation of PDK isoforms by binding to the E2·E3BP core: (i) PDK2 needs no activation by E2·E3BP for efficient functioning, while PDK4 was the least effective of the four isoforms, and could not be activated by E2·E3BP. Hence, development of inhibitors to the interaction of PDK2 and PDK4 with E2·E3BP is not promising; (ii) Design of inhibitors to interfere with interaction of E2·E3BP with PDK1 and PDK3 is promising. PDK3 needs E2·E3BP core for activation, an activation best achieved by synergistic combination of E2-derived catalytic domain and tridomain." @default.
- W2590703204 created "2017-03-03" @default.
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- W2590703204 date "2017-02-23" @default.
- W2590703204 modified "2023-09-26" @default.
- W2590703204 title "Global view of cognate kinase activation by the human pyruvate dehydrogenase complex" @default.
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- W2590703204 doi "https://doi.org/10.1038/srep42760" @default.
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