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Mismatch Discrimination and Efficient Photomodulation with Split 10-23 DNAzymes.

Brittani K Ruble¹, Julia L Richards, Jasmina C Cheung-Lau

¹Department of Chemistry, University of Pennsylvania, 231 S. 34 Street, Philadelphia, PA 19104.

Inorganica Chimica Acta

|May 1, 2012

Summary

This study reveals a 10-23 DNAzyme with low magnesium ion dependence, enabling broader biological applications. Split DNAzymes offer enhanced sensitivity to mismatches and photomodulation capabilities.

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Area of Science:

Biochemistry
Molecular Biology
Synthetic Biology

Background:

DNA enzymes (DNAzymes) are catalytic DNA molecules with applications in biochemistry and sensing.
The 10-23 DNAzyme is known for its RNA degradation activity and cellular applications.

Purpose of the Study:

To investigate the magnesium ion dependence of a specific 10-23 DNAzyme.
To explore the functionality and properties of a split 10-23 DNAzyme.
To demonstrate photomodulation of split DNAzyme activity.

Main Methods:

Assessing DNAzyme activity across varying magnesium ion concentrations.
Evaluating the performance of split 10-23 DNAzymes with different cleavage sites.
Introducing photocleavable moieties for activity control.

Main Results:

The 10-23 DNAzyme exhibits significantly low magnesium ion dependence ([Mg(2+)] = 0.01 mM).
Split 10-23 DNAzymes show optimal activity when divided after the 7th or 8th base.
Split DNAzymes require higher magnesium concentrations but offer increased sensitivity to single-base mismatches.
Photomodulation of split DNAzyme activity was achieved using a photocleavable biotin-streptavidin system.

Conclusions:

The low metal ion dependence broadens the potential biological applications of DNAzymes.
Split DNAzymes present a versatile platform for biosensing with tunable properties.
Photomodulation offers a novel method for controlling DNAzyme activity in biological systems.