title: Carbamoyl-phosphate synthetase II in kinetoplastids.
abstract: Genes for carbamoyl-phosphate synthetase II (CPS II), the first enzyme of de novo pyrimidine biosynthesis, were cloned from kinetoplastids, Trypanosoma cruzi and Leishmania mexicana. T. cruzi CPS II gene encodes a protein of 1524 amino acids that encompasses the glutaminase and CPS domains, but incorporates neither aspartate carbamoyltransferase nor dihydroorotase. The residue corresponding to lysine 993 of Escherichia coli CPS, a residue that characterizes the CPS inhibited by UMP and that is replaced by tryptophan in those inhibited by UTP, is in kinetoplastids a hydrophilic glutamine, in line with the preferential inhibition by UDP of kinetoplastid CPS II.
authors.affiliation: Department of Parasitology, Juntendo University School of Medicine, Hongo 2-1-1, Bunkyo-ku, Tokyo 113-8421, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Nara
authors.forename: G
authors.initials: G
authors.lastname: Gao
authors.forename: H
authors.initials: H
authors.lastname: Yamasaki
authors.forename: J
authors.initials: J
authors.lastname: Nakajima-Shimada
authors.forename: T
authors.initials: T
authors.lastname: Aoki
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D001665:Binding Sites / Q000235:genetics; D002223:Carbamoyl-Phosphate Synthase (Glutamine-Hydrolyzing) / Q000737:chemistry*; D003001:Cloning, Molecular; D016830:Kinetoplastida / Q000201:enzymology; D007894:Leishmania mexicana / Q000201:enzymology*; D008969:Molecular Sequence Data; D015800:Protozoan Proteins / Q000737:chemistry; D016415:Sequence Alignment; D017422:Sequence Analysis, DNA; D014349:Trypanosoma cruzi / Q000201:enzymology*; D014544:Uridine Triphosphate / Q000494:pharmacology
chemical_list: D015800:Protozoan Proteins; D002223:Carbamoyl-Phosphate Synthase (Glutamine-Hydrolyzing); D014544:Uridine Triphosphate