Modular Scaffold Crystals for Programmable Installation and Structural Observation of DNA-Binding Proteins

Area of Science:

• Structural Biology
• Biochemistry
• Materials Science

Background:

• Biomacromolecule crystallization for structural studies is challenging, often requiring extensive experimental screening.
• Existing methods struggle with organizing diverse guest molecules for diffraction-quality crystal formation.

Purpose of the Study:

• To develop a novel protein-DNA co-crystal system for efficient and high-throughput biomacromolecule crystallization.
• To enable precise control over guest molecule positioning within the crystal lattice.

Main Methods:

• Engineered protein-DNA co-crystals composed of stacked DNA scaffolds and protein columns.
• Designed solvent channels for guest protein diffusion and installation.
• Utilized DNA strut variation for positionally controlled guest protein binding.

Main Results:

• Demonstrated successful co-crystal formation with tunable DNA scaffolds.
• Achieved sub-nanometer control over guest macromolecule position and orientation.
• Established a method decoupling scaffold crystal growth from guest molecule soaking.

Conclusions:

• The protein-DNA co-crystal system facilitates high-throughput structure determination of DNA-binding proteins and conjugates.
• This approach overcomes limitations of traditional crystallization screening.
• Offers potential for functional applications beyond structural biology.