Abstract
The kinetic and regulatory properties of partially purified phosphoenolpyruvate (PEP) carboxykinase (EC 4.1.1.32) from Rhodospirillum rubrum were studied. The enzyme was active with guanosine-and inosinephosphates and must thus be classified as GTP (ITP): oxaloacetate carboxylyase (transphosphorylating). In the direction of oxaloacetate-formation, the enzyme was strongly inhibited by ATP (Ki=0.03 mM). ITP, UTP, CTP and GTP were less inhibitory. The inhibition was competitive with respect to GDP or IDP, but not with respect to PEP. In the direction of PEP-synthesis, the enzyme was not inhibited, but rather activated by ATP.
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Klemme, JH. Unidirectional inhibition of phosphoenolpyruvate carboxykinase from Rhodospirillum rubrum by ATP. Arch. Microbiol. 107, 189–192 (1976). https://doi.org/10.1007/BF00446838
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DOI: https://doi.org/10.1007/BF00446838