Conformational flexibility influences structure-function relationships in nucleic acid N-methyl demethylases.

Area of Science:

• Biochemistry
• Molecular Biology
• Computational Biology

Background:

• N-methylation of DNA/RNA bases plays regulatory and damaging roles, implicated in diseases like cancer.
• Bacterial AlkB and human FTO are key DNA/RNA demethylases belonging to the Fe(II) and 2-oxoglutarate oxygenase superfamily.

Purpose of the Study:

• To investigate the influence of conformational dynamics and protein flexibility on the structure-function relationships of AlkB and FTO.
• To understand how protein environment and flexibility impact substrate binding and catalysis in these demethylases.

Main Methods:

• Utilized computational modeling and simulation techniques.
• Analyzed conformational dynamics and correlated motions within AlkB and FTO.
• Examined the flexibility of DNA substrates and protein domains during simulations.

Main Results:

• Conformational dynamics were shown to influence structure-function relationships, explaining substrate preferences (e.g., 1-methyladenine for AlkB).
• DNA substrate flexibility in AlkB affects correlated motions between protein domains and active site loops.
• FTO's N- and C-terminal domains exhibit relative movements crucial for substrate binding.
• Clinically relevant substitutions impacting catalysis are integrated into the correlated motion networks of AlkB and FTO.

Conclusions:

• Protein flexibility and the overall protein environment are critical for determining the geometry of reactant complexes in DNA/RNA demethylases.
• Computational approaches provide insights into the dynamic mechanisms underlying the function of AlkB and FTO.