Internal water and microsecond dynamics in myoglobin.
Myoglobin (Mb) binds diatomic ligands, like O2, CO, and NO, in a cavity that is only transiently accessible. Crystallography and molecular simulations show that the ligands can migrate through an extensive network of transiently connected cavities but disagree on the locations and occupancy of internal hydration sites. Here, we use water (2)H and (17)O magnetic relaxation dispersion (MRD) to chara
