title: Three-dimensional structures of L-asparaginase from Erwinia carotovora complexed with aspartate and glutamate.
abstract: The crystal structures of Erwinia carotovora L-asparaginase complexed with L-aspartate and L-glutamate were determined at 1.9 and 2.2 A, respectively, using the molecular-replacement method and were refined to R factors of about 21% in both cases. The positions of the ligands in the active site were located. A comparison of the new structures with the known structures of Escherichia coli L-asparaginase and Er. chrysanthemi L-asparaginase was performed. It was found that the arrangement of the ligands practically coincides in all three enzymes. The peculiarities of the quaternary structure of the enzyme, the possible role of water molecules in the enzyme action and the conformational changes during the catalyzed reaction are discussed.
authors.affiliation: Institute of Protein Research, Russian Academy of Sciences, 142290 Pushchino, Moscow Region, Russia.
authors.forename: O V
authors.initials: OV
authors.lastname: Kravchenko
authors.forename: Yu A
authors.initials: YA
authors.lastname: Kislitsin
authors.forename: A N
authors.initials: AN
authors.lastname: Popov
authors.forename: S V
authors.initials: SV
authors.lastname: Nikonov
authors.forename: I P
authors.initials: IP
authors.lastname: Kuranova
mesh_terms: D001215:Asparaginase / Q000737:chemistry*; D001224:Aspartic Acid / Q000737:chemistry*; D018360:Crystallography, X-Ray; D018698:Glutamic Acid / Q000737:chemistry*; D008958:Models, Molecular; D016973:Pectobacterium carotovorum / Q000201:enzymology*; D011487:Protein Conformation
chemical_list: D001224:Aspartic Acid; D018698:Glutamic Acid; D001215:Asparaginase