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Using Modified Synthetic Oligonucleotides to Assay Nucleic Acid-Metabolizing Enzymes

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Thermolabile duplex-specific nuclease.

Veronika E Anisimova¹, Ekaterina V Barsova, Ekaterina A Bogdanova

¹Shemiakin and Ovchinnikov Institute of Bioorganic Chemistry RAS, Miklukho-Maklaya 16/10, 117871, Moscow, Russia. evanika@yandex.ru

Biotechnology Letters

|September 24, 2008

Summary

This summary is machine-generated.

Researchers developed a thermolabile duplex-specific nuclease (DSN-TL) mutant from king crab. This enzyme retains wild-type properties but has lower thermal stability, making it ideal for removing genomic DNA from RNA for RT-PCR applications.

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Area of Science:

Biochemistry
Molecular Biology
Enzymology

Background:

Duplex-specific nuclease (DSN) enzymes are crucial for nucleic acid manipulation.
Existing DSNs have limitations in thermal stability and activity for certain applications.
Genomic DNA contamination is a significant issue in RNA-based molecular assays like RT-PCR.

Purpose of the Study:

To engineer a novel DSN mutant with altered thermal stability.
To characterize the enzymatic properties of the new mutant.
To evaluate its utility in removing genomic DNA from RNA samples for quantitative RT-PCR.

Main Methods:

Random mutagenesis of the king crab DSN gene.
Biochemical characterization of the resulting mutant enzyme (DSN-TL).
Assessment of thermal stability, processivity, catalytic activity, and resistance to proteinase K.
Testing DSN-TL's efficacy in removing genomic DNA from RNA samples.

Main Results:

A thermolabile DSN mutant (DSN-TL) was successfully generated.
DSN-TL retains wild-type DSN properties, including high processivity and selective dsDNA cleavage.
DSN-TL exhibits significantly lower thermal inactivation temperature (15-20°C lower than DNase I and shrimp nuclease).
DSN-TL demonstrates over 10-fold higher catalytic activity and resistance to proteinase K.

Conclusions:

The novel thermolabile DSN (DSN-TL) offers enhanced performance characteristics compared to existing enzymes.
Its unique properties, including lower thermal stability and high activity, make it highly suitable for genomic DNA removal in RNA preparations.
DSN-TL is a valuable tool for improving the accuracy and efficiency of quantitative RT-PCR and other RNA-based analyses.