Modulation of buried ionizable groups in proteins with engineered surface charge

Area of Science:

• Biochemistry
• Protein Engineering
• Structural Biology

Background:

• Proteins can accommodate hydrophobic-to-ionizable-residue mutations.
• Understanding the behavior of buried ionizable groups is crucial for protein function.

Purpose of the Study:

• To experimentally demonstrate that surface charge distribution can modulate buried ionizable groups.
• To explore the potential of charge burial in protein engineering.

Main Methods:

• Rational design of protein surface charge distribution.
• Experimental characterization of buried ionizable group properties (pK, protonation state, local dynamics).

Main Results:

• Surface charge modulation effectively altered the pK values of buried ionizable groups.
• Protonation state and local dynamics of buried residues were significantly influenced.
• Demonstrated efficient modulation of essential properties through rational design.

Conclusions:

• Protein surface charge engineering is a viable strategy to control buried ionizable group properties.
• This approach offers new avenues for protein engineering and the exploitation of charge burial.
• Enables fine-tuning of protein characteristics for specific applications.