Abstract
Sequence-specific assignment of 1H nuclear magnetic resonance spectra of acylphosphatase (EC 3.6.1.7) isolated from rabbit skeletal muscle have made it possible to identify short distance constraints from nuclear Overhauser enhancement spectra, to evaluate spin-spin coupling constants of many backbone amide hydrogens and to assess their slow exchange with deuterons in 2H 2O solution. Analysis of these data show that the major regular secondary structure of the enzyme consists of five extended β-strands, four of which are arranged in an antiparallel β-sheet, while the fifth is attached parallel. A helix consisting of 11 residues has also been identified. Consideration of additional distance constraints between sequentially remote residues has allowed us to give an outline of the overall fold of the protein.
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