title: Purification, crystallization and preliminary X-ray analysis of the regulatory subunit of aspartate kinase from Thermus thermophilus.
abstract: Aspartate kinase (AK) from Thermus thermophilus, which catalyzes the first step of threonine and methionine biosynthesis, is regulated via feedback inhibition by the end product threonine. To elucidate the mechanism of regulation of AK, the regulatory subunit (the beta subunit of T. thermophilus AK) was crystallized in the presence of the inhibitor threonine. Diffraction data were collected to 2.15 A at a synchrotron source. The crystal belongs to the cubic space group P4(3)32 or P4(1)32, with unit-cell parameters a = b = c = 141.8 A.
authors.affiliation: Biotechnology Research Center, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan.
authors.forename: Ayako
authors.initials: A
authors.lastname: Yoshida
authors.forename: Takeo
authors.initials: T
authors.lastname: Tomita
authors.forename: Tomohisa
authors.initials: T
authors.lastname: Kuzuyama
authors.forename: Makoto
authors.initials: M
authors.lastname: Nishiyama
mesh_terms: D001222:Aspartate Kinase / Q000037:antagonists & inhibitors / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism; D001426:Bacterial Proteins / Q000037:antagonists & inhibitors / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism; D018360:Crystallography, X-Ray; D047428:Protein Kinase Inhibitors / Q000737:chemistry; D021122:Protein Subunits; D016963:Thermus thermophilus / Q000201:enzymology* / Q000235:genetics; D013912:Threonine / Q000737:chemistry
chemical_list: D001426:Bacterial Proteins; D047428:Protein Kinase Inhibitors; D021122:Protein Subunits; D013912:Threonine; D001222:Aspartate Kinase