Proximity-Dependent Activation of Split DNAzyme Kinase

Area of Science:

• Biochemistry
• Molecular Biology
• Biosensor Technology

Background:

• Split nucleic acid enzymes are emerging as key components in biosensor development.
• Existing split enzyme strategies often rely on Watson-Crick base pairing for reconstitution.

Purpose of the Study:

• To introduce a novel split strategy for DNAzyme kinase, termed proximity-dependent activation of split DNAzyme kinase (ProxSDK).
• To demonstrate the application of ProxSDK in a biosensing system for detecting DNA-protein interactions.

Main Methods:

• Splitting the DNAzyme kinase into two non-functional fragments (Dk1sub and Dk1enz).
• Utilizing proximity-dependent activation, where target-induced interaction reconstitutes enzyme activity without Watson-Crick base pairing.
• Engineering a biosensing system to measure specific DNA-protein interactions using ProxSDK.

Main Results:

• Successfully split the DNAzyme kinase into two independent fragments, Dk1sub and Dk1enz.
• Demonstrated that the fragments reconstitute enzymatic activity upon proximity to a specific target, enabling DNA phosphorylation.
• Engineered a functional biosensor capable of measuring specific DNA-protein interactions.

Conclusions:

• ProxSDK offers a novel mechanism for split enzyme activation based on proximity rather than base pairing.
• This approach provides a versatile platform for developing advanced biosensors.
• ProxSDK has potential applications in biosensing, molecular imaging, and clinical diagnostics.