title: Identification of valine/leucine/isoleucine and threonine/alanine/glycine proton-spin systems of Escherichia coli adenylate kinase by selective deuteration and selective protonation.
abstract: Adenylate kinase from two types of Escherichia coli strains, a wild-type and a leucine-auxotrophic strain, was purified. On the one hand, growing the leucine-auxotrophic bacteria on a medium containing deuterated leucine yielded E. coli adenylate kinase with all leucine residues deuterated. On the other hand, by growing the wild-type bacteria on deuterated medium with phenylalanine, threonine and isoleucine present as protonated specimens, 80% randomly deuterated enzyme with protonated phenylalanine, threonine and isoleucine residues could be prepared. Use of these proteins enabled identification of the spin systems of these amino acid residues in the n.m.r. spectra of the protein.
authors.affiliation: Max-Planck-Institut für Medizinische Forschung, Abteilung Biophysik, Heidelberg, Federal Republic of Germany.
authors.forename: I
authors.initials: I
authors.lastname: Bock-Möbius
authors.forename: M
authors.initials: M
authors.lastname: Brune
authors.forename: A
authors.initials: A
authors.lastname: Wittinghofer
authors.forename: H
authors.initials: H
authors.lastname: Zimmermann
authors.forename: R
authors.initials: R
authors.lastname: Leberman
authors.forename: M T
authors.initials: MT
authors.lastname: Dauvergne
authors.forename: S
authors.initials: S
authors.lastname: Zimmermann
authors.forename: B
authors.initials: B
authors.lastname: Brandmeier
authors.forename: P
authors.initials: P
authors.lastname: Rösch
mesh_terms: D000263:Adenylate Kinase / Q000302:isolation & purification*; D000596:Amino Acids / Q000032:analysis*; D003903:Deuterium; D004926:Escherichia coli / Q000201:enzymology* / Q000254:growth & development; D009682:Magnetic Resonance Spectroscopy
chemical_list: D000596:Amino Acids; D003903:Deuterium; D000263:Adenylate Kinase