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Conformational properties of native sperm whale apomyoglobin in solution
J T Lecomte1, S F Sukits, S Bhattacharya
1Department of Chemistry and the Center for Biomolecular Structure and Function, the Pennsylvania State University, University Park 16802, USA. jtl1@psu.edu
Protein Science : a Publication of the Protein Society
|July 28, 1999
Summary
Sperm whale apomyoglobin
Area of Science:
- Biochemistry
- Structural Biology
- Biophysics
Background:
- Apomyoglobin from sperm whale is a model protein for studying ligand binding, folding, and stability.
- Understanding its solution conformation is crucial for interpreting experimental data.
Purpose of the Study:
- To elucidate the conformational properties of sperm whale apomyoglobin in solution.
- To generate a refined structural model using NMR data.
Main Methods:
- Homonuclear and heteronuclear Nuclear Magnetic Resonance (NMR) spectroscopy (13C and 15N).
- Nuclear Overhauser Effect (NOE) analysis for distance restraints.
- 8-anilino-1-naphthalenesulfonic acid (ANS) perturbation for conformational flexibility.
- 3JalphaH-NH values for dihedral angle restraints.
- X-PLOR and simulated annealing for structure calculation.
Main Results:
- Assignments confirmed for NOEs in folded regions, providing distance restraints.
- ANS perturbation indicated conformational flexibility in regions distant from the binding site.
- A low-resolution structural model was generated, approximating the native state.
- Improved representation of helices A, B, E, G, and H.
- CD corner, H-helix end, and EF-F-FG segment remained less defined.
Conclusions:
- The generated structural model provides a valid approximation of apomyoglobin's native state.
- The study enhances the representation of folded regions, offering insights into protein structure-function relationships.
- Further characterization is needed for less defined segments.