Two-dimensional NMR approaches to the study of protein structure and function

Area of Science:

• Biochemistry and Structural Biology
• Molecular Biophysics
• Protein Science

Background:

• Two-dimensional Fourier transform Nuclear Magnetic Resonance (NMR) spectroscopy, pioneered by Wüthrich and Ernst, enhances protein spectral assignments.
• Multinuclear two-dimensional NMR approaches show significant promise for protein analysis.
• Understanding protein sequence-structure-function relationships is crucial for biological insights.

Purpose of the Study:

• To apply one- and two-dimensional NMR methods to homologous proteins with single amino acid substitutions.
• To elucidate the relationships between protein sequence, structure, and function.
• To determine primary structural requirements for changes in protein properties like conformation, dynamics, and pK'a values.

Main Methods:

• Utilizing current one-dimensional (1D) and two-dimensional (2D) NMR techniques.
• Studying protein families with defined amino acid substitutions, such as avian ovomucoid third domains.
• Leveraging available X-ray crystallographic structures for comparative analysis.

Main Results:

• Bird ovomucoids, differing by single amino acid substitutions, serve as an effective model system.
• The study aims to delineate the structural and dynamic consequences of single amino acid replacements.
• Investigating photosynthetic electron transport proteins like ferredoxin and plastocyanin using these NMR methods.

Conclusions:

• Advanced NMR spectroscopy is instrumental in dissecting the impact of amino acid variations on protein characteristics.
• This research facilitates a deeper understanding of protein evolution and functional adaptation.
• The findings contribute to predicting protein behavior based on sequence and structural modifications.