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Related Experiment Videos

A spectrophotometric method to quantify linear DNA.

Manoj Samuel1, Meiqing Lu, Catherine J Pachuk

  • 1Wyeth-Ayerst Research, Collegeville, PA 19355, USA.

Analytical Biochemistry
|February 28, 2003
PubMed
Summary
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This study introduces a new spectrophotometric assay to quantify linear DNA by measuring ADP production from ATP-dependent deoxyribonuclease activity. This method accurately determines linear DNA levels, crucial for assessing plasmid DNA quality in gene therapy applications.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Analytical Chemistry

Background:

  • Quantifying linear DNA is essential for assessing DNA sample quality, particularly for applications like gene therapy.
  • Existing methods may not accurately distinguish between linear and circular DNA forms.
  • ATP-dependent deoxyribonucleases offer a potential enzymatic basis for DNA quantification.

Purpose of the Study:

  • To develop and validate a novel spectrophotometric method for the accurate quantification of linear DNA.
  • To characterize the kinetic properties of the ATP-dependent deoxyribonuclease used in the assay.
  • To demonstrate the utility of the assay for quality control of plasmid DNA preparations.

Main Methods:

  • A spectrophotometric assay was developed utilizing an ATP-dependent deoxyribonuclease to digest linear DNA.

Related Experiment Videos

  • The assay measures ADP production, which is coupled to NADH oxidation via pyruvate kinase and lactate dehydrogenase.
  • Nicotinamide adenine dinucleotide (NAD) formation was monitored spectrophotometrically at 340 nm.

    • Main Results:

    • The assay accurately quantifies both single-stranded and double-stranded linear DNA.
    • Covalently closed circular (CCC) and nicked open circular DNA were not substrates, indicating high specificity for linear DNA.
    • The enzyme exhibited Michaelis-Menten kinetics with a K(m) of 0.6 microM and V(max) of 30 nmol/min/mg.
    • The assay is not inhibited by RNA or CCC DNA, further confirming specificity.

    Conclusions:

    • A robust and specific spectrophotometric method for linear DNA quantification has been established.
    • This assay is suitable for monitoring the quality of plasmid DNA preparations, especially for gene therapy.
    • The enzyme's specificity for linear DNA makes it a valuable tool in molecular biology and biotechnology.