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- W2112692012 abstract "The single polypeptide chain of Bacillus thermodenitrificans pyruvate carboxylase (PC) is composed of the biotin carboxylase (BC), carboxyl transferase (CT) and biotin carboxyl carrier protein (BCCP) domains from the amino terminus. This polypeptide chain was divided into two between the CT and BCCP domains. The resulting proteins, PC-(BC + CT) and PC-(BCCP), were expressed in Escherichia coli separately, purified to homogeneity and characterized. PC-(BC + CT) was 4% as active as native PC in the carboxylation of pyruvate with PC-(BCCP) as substrate with a K(m) of 39 microM. Moreover, acetyl-CoA stimulated the carboxylation of PC-(BCCP) about 3-fold, whereas it was without effect in the corresponding reaction with free biotin. In addition to these engineered proteins, another form of enzyme was also constructed in which the BC domain of B.thermodenitrificans PC was replaced with the BC subunit of Aquifex aeolicus PC, whose activity is independent of acetyl-CoA. The resulting chimera was about 7% as active as native PC, but its activity was independent of acetyl-CoA. On the basis of these observations, the mechanism by which acetyl-CoA regulates the reaction of PC is discussed." @default.
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- W2112692012 date "2005-02-01" @default.
- W2112692012 modified "2023-09-25" @default.
- W2112692012 title "Construction of new forms of pyruvate carboxylase to assess the allosteric regulation by acetyl-CoA" @default.
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- W2112692012 doi "https://doi.org/10.1093/protein/gzi011" @default.
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