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• W1574037572 abstract "The catalytic functions of the amino-terminal and carboxyl-terminal halves of the large subunit of carbamoyl phosphate synthetase from Escherichia coli have been identified using site-directed mutagenesis. Glycine residues at positions 176, 180, and 722 within the putative mononucleotide-binding site were replaced with isoleucine residues. Each of these mutations resulted in at least a 1 order of magnitude reduction in the Vmax for carbamoyl phosphate synthesis. The mutations on the amino-terminal half, G176I and G180I, caused slight reduction in the rate of synthesis of ATP from ADP and carbamoyl phosphate (the partial ATP synthesis reaction) but the bicarbonate-dependent ATPase reaction velocity was reduced to less than 10% of the wild-type rate. The mutant G722I, which is on the carboxy-terminal half, caused the partial ATP synthesis reaction to be reduced by 1 order of magnitude but the bicarbonate-dependent ATPase reaction was reduced only slightly. All three mutations are within regions which show homology to the putative glycine-rich loops of many ATP-binding proteins. These results have been interpreted to suggest that the two homologous halves of the large subunit of carbamoyl phosphate synthetase each contain a binding site for ATP. The NH2-terminal domain contains the portion of the large subunit that is primarily involved with the phosphorylation of bicarbonate to carboxy phosphate while the COOH-terminal domain contains the region of the enzyme that catalyzes the phosphorylation of carbamate to carbamoyl phosphate." @default.
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• W1574037572 date "1990-06-01" @default.
• W1574037572 modified "2023-10-13" @default.
• W1574037572 title "Dissection of the functional domains of Escherichia coli carbamoyl phosphate synthetase by site-directed mutagenesis." @default.
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• W1574037572 doi "https://doi.org/10.1016/s0021-9258(19)38991-4" @default.
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