title: NMR secondary structure of the plasminogen activator protein staphylokinase.
abstract: Staphylokinase (Sak) is a 15.5 kDa protein secreted by several strains of Staphylococcus aureus. Due to its ability to convert plasminogen, the inactive proenzyme of the fibrinolytic system, into plasmin, Sak is presently undergoing clinical trials for blood clot lysis in the treatment of thrombovascular disorders. With a view to developing a better understanding of the mode of action of Sak, we have initiated a structural investigation of Sak via multidimensional heteronuclear NMR spectroscopy employing uniformly 15N- and 15N, 13C-labelled Sak. Sequence-specific resonance assignments have been made employing 15N-edited TOCSY and NOE experiments and from HNCACB, CBCA(CO)NH, HBHA-(CBCACO) NH and CC(CO)NH sets of experiments. From an analysis of the chemical shifts, 3JHNH alpha scalar coupling constants, NOEs and HN exchange data, the secondary structural elements of Sak have been characterized.
authors.affiliation: Department of Molecular Biophysics/NMR Spectroscopy, Institute of Molecular Biotechnology, Jena, Germany.
authors.forename: O
authors.initials: O
authors.lastname: Ohlenschläger
authors.forename: R
authors.initials: R
authors.lastname: Ramachandran
authors.forename: J
authors.initials: J
authors.lastname: Flemming
authors.forename: K H
authors.initials: KH
authors.lastname: Gührs
authors.forename: B
authors.initials: B
authors.lastname: Schlott
authors.forename: L R
authors.initials: LR
authors.lastname: Brown
mesh_terms: D000595:Amino Acid Sequence; D004792:Enzyme Precursors / Q000737:chemistry; D005342:Fibrinolysis; D005343:Fibrinolytic Agents; D006801:Humans; D009682:Magnetic Resonance Spectroscopy / Q000379:methods; D008666:Metalloendopeptidases / Q000737:chemistry*; D008961:Models, Structural; D008969:Molecular Sequence Data; D017433:Protein Structure, Secondary; D011994:Recombinant Proteins / Q000737:chemistry; D016415:Sequence Alignment; D017386:Sequence Homology, Amino Acid; D013211:Staphylococcus aureus / Q000201:enzymology
chemical_list: D004792:Enzyme Precursors; D005343:Fibrinolytic Agents; D011994:Recombinant Proteins; D008666:Metalloendopeptidases; C022653:auR protein, Staphylococcus aureus