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Literature summary for 6.3.5.5 extracted from

  • Bueso, J.; Cervera, J.; Fresquet, V.; Marina, A.; Lusty, C.J.; Rubio, V.
    Photoaffinity labeling with the activator IMP and Site-Directed mutagenesis of histidine 995 of carbamoyl phosphate synthetase from Escherichia coli demonstrate that the binding site for IMP overlaps with that for the inhibitor UMP (1999), Biochemistry, 38, 3910-3917.
    View publication on PubMed
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Activating Compound

Activating Compound Comment Organism Structure
IMP His995, located in the C-terminal regulatory domain, is cross-linked with IMP Escherichia coli
ornithine
-
 Escherichia coli

Protein Variants

Protein Variants Comment Organism
H995A mutant exhibits normal kinetics for the activator ornithine and for the substrates in presence of ornithine, the mutation selectiviely decrease 5.6 and 2.3fold the apparent affinity for UMP and IMP, mutation abolishes the ability to be photoaffinity labeled with IMP Escherichia coli

Inhibitors

Inhibitors Comment Organism Structure
UMP Lys993 is cross-linked with UMP Escherichia coli

Natural Substrates/ Products (Substrates)

Natural Substrates Organism Comment (Nat. Sub.) Natural Products Comment (Nat. Pro.) Rev. Reac.
2 ATP + L-Gln + HCO3- Escherichia coli the product carbamoyl phosphate is an essential precursor of arginine and pyrimidine biosynthesis 2 ADP + phosphate + L-Glu + carbamoyl phosphate
-
 ?

Organism

Organism UniProt Comment Textmining
Escherichia coli
-
-
-

Substrates and Products (Substrate)

Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
2 ATP + L-Gln + HCO3-
-
 Escherichia coli 2 ADP + phosphate + L-Glu + carbamoyl phosphate
-
 ?
2 ATP + L-Gln + HCO3- the product carbamoyl phosphate is an essential precursor of arginine and pyrimidine biosynthesis Escherichia coli 2 ADP + phosphate + L-Glu + carbamoyl phosphate
-
 ?
2 ATP + NH4+ + HCO3-
-
 Escherichia coli 2 ADP + phosphate + carbamoyl phosphate
-
 ?