Rapid Recycle 13C‘,15N and 13C,13C‘ Heteronuclear and Homonuclear Multiple Quantum Coherence Detection for Resonance Assignments in Paramagnetic Proteins: Example of Ni2+-Containing Acireductone Dioxygenase

NMR resonance assignments in the vicinity of paramagnetic metals in proteins are often difficult or impossible to make using conventional 1H detected 2-D and 3-D methods due to paramagnetic line broadening. The applicability of 13Calpha{13C'} and 13C'{15N} multiple quantum coherence methods for residue-specific assignments of resonances near paramagnetic centers is described, using the Ni2+-containing enzyme acireductone dioxygenase as an example.