title: Complete assignment of the 500 MHz 1H-NMR spectra of bleomycin A2 in H2O and D2O solution by means of two-dimensional NMR spectroscopy.
abstract: 1H-NMR spectra of bleomycin A2 recorded at 500 MHz in D2O and H2O at 24 degrees C and 3 degrees C were investigated. Resonances of the individual spin systems were identified by using two-dimensional correlation spectroscopy (COSY), two-dimensional spin echo correlated spectroscopy (SECSY) and by the application of two-dimensional Nuclear Overhauser Effect spectroscopy (NOESY). Employment of these techniques allowed the assignment of 113 exchangeable and 59 non-exchangeable protons in the 1H NMR spectrum of bleomycin A2. By means of 2D NOE spectroscopy also interresidual connectivities could be observed. Comparison of the NOESY spectra at 3 degrees C and 24 degrees C suggest that at low temperatures the central party of the bleomycin A2 molecule tends to adopt an extended conformation.
mesh_terms: D001761:Bleomycin; D003903:Deuterium; D017666:Deuterium Oxide; D009682:Magnetic Resonance Spectroscopy; D008968:Molecular Conformation; D015394:Molecular Structure; D012996:Solutions; D014867:Water
chemical_list: D012996:Solutions; D014867:Water; D001761:Bleomycin; D003903:Deuterium; D017666:Deuterium Oxide