title: Use of protein trans-splicing to produce active and segmentally (2)H, (15)N labeled mannuronan C5-epimerase AlgE4.
abstract: Alginate epimerases are large multidomain proteins capable of epimerising C5 on beta-D-mannuronic acid (M) turning it into alpha-L-guluronic acid (G) in a polymeric alginate. Azotobacter vinelandii secretes a family of seven epimerases, each of which is capable of producing alginates with characteristic G distribution patterns. All seven epimerases consist of two types of modules, denoted A and R, in varying numbers. Attempts to study these enzymes with solution-state NMR are hampered by their size-the smallest epimerase, AlgE4, consisting of one A- and one R-module, is 58 kDa, resulting in heavy signal overlap impairing the interpretation of NMR spectra. Thus we obtained segmentally (2)H, (15)N labeled AlgE4 isotopomeres (A-[(2)H, (15)N]-R and [(2)H, (15)N]-A-R) by protein trans-splicing using the naturally split intein of Nostoc punctiforme. The NMR spectra of native AlgE4 and the ligated versions coincide well proving the conservation of protein structure. The activity of the ligated AlgE4 was verified by two different enzyme activity assays, demonstrating that ligated AlgE4 displays the same catalytic activity as wild-type AlgE4.
authors.affiliation: Department of Biotechnology, Chemistry and Environmental Engineering, Aalborg University, Aalborg DK-9000, Denmark.
authors.forename: Edith
authors.initials: E
authors.lastname: Buchinger
authors.forename: Finn L
authors.initials: FL
authors.lastname: Aachmann
authors.forename: A Sesilja
authors.initials: AS
authors.lastname: Aranko
authors.forename: Svein
authors.initials: S
authors.lastname: Valla
authors.forename: Gudmund
authors.initials: G
authors.lastname: Skjåk-Braek
authors.forename: Hideo
authors.initials: H
authors.lastname: Iwaï
authors.forename: Reinhard
authors.initials: R
authors.lastname: Wimmer
mesh_terms: D000595:Amino Acid Sequence; D001426:Bacterial Proteins / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism*; D002238:Carbohydrate Epimerases / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism*; D008969:Molecular Sequence Data; D046937:Nostoc / Q000737:chemistry; D019906:Nuclear Magnetic Resonance, Biomolecular / Q000379:methods*; D019154:Protein Splicing; D020040:Trans-Splicing
chemical_list: D001426:Bacterial Proteins; D002238:Carbohydrate Epimerases; C086519:mannuronan c-5-epimerase