A universally applicable process for preparing stoichiometrically 1:1 labelled functional proteins.

Area of Science:

• Biochemistry
• Molecular Biology
• Biotechnology

Background:

• Accurate protein labeling is crucial for various biological assays and diagnostics.
• Existing methods often result in heterogeneous labeling or protein denaturation.
• A need exists for a scalable and gentle protein labeling and purification technique.

Purpose of the Study:

• To develop a universal method for attaching a single dye-label to proteins.
• To establish a purification strategy that yields homogeneous, biologically active labeled proteins.
• To enable precise stoichiometric control over dye-protein conjugation.

Main Methods:

• A DNA sequence linked to a dye molecule serves as a tag for specific proteins.
• Proteins are labeled in excess to ensure a 1:1 stoichiometric ratio of dye to protein.
• Affinity purification is achieved using magnetic beads with complementary oligonucleotides, followed by elution with a fully complementary sequence.

Main Results:

• A robust and universally applicable protein labeling and purification process was established.
• The method successfully produced biologically active proteins with a stoichiometric 1:1 ratio of dye-label.
• Purified proteins retained their structure and biological activity due to the gentle purification conditions.

Conclusions:

• This DNA-tag mediated approach provides a highly specific and efficient method for single-molecule protein labeling.
• The developed technique offers a significant advancement for producing homogeneous, functional protein conjugates.
• The process is adaptable for diverse protein targets and labeling requirements in research and diagnostics.