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Limited reverse transcriptase activity of phi29 DNA polymerase.

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|March 20, 2018
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Phi29 DNA polymerase can amplify RNA-containing DNA circles using rolling circle amplification (RCA). This enzyme shows reverse transcriptase activity, expanding its use in amplifying chimeric probes like padlock probes.

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Area of Science:

  • Molecular Biology
  • Enzymology

Background:

  • Phi29 DNA polymerase is crucial for DNA amplification (RCA, MDA) and sequencing (SMRT).
  • Its application typically involves DNA substrates.

Purpose of the Study:

  • To investigate phi29 DNA polymerase's ability to amplify RNA-containing circular substrates via RCA.
  • To characterize the enzyme's activity and cofactor requirements with RNA substitutions.

Main Methods:

  • Rolling Circle Amplification (RCA) of circular DNA and RNA-containing DNA substrates.
  • DNA sequencing to analyze RCA products.
  • Enzymatic assays with varying cofactor concentrations (Mn2+, Mg2+).

Main Results:

  • Phi29 DNA polymerase successfully amplified circular substrates with single RNA substitutions.
  • Amplification rate was comparable to DNA-only substrates, with a preference for RNA pyrimidines.
  • RCA efficiency decreased with multiple RNA substitutions but was partially restored by DNA interspacing.
  • Manganese ions (Mn2+) supported RNA replication during RCA, and sequencing confirmed accurate base incorporation, indicating reverse transcriptase activity.

Conclusions:

  • Phi29 DNA polymerase exhibits reverse transcriptase activity, enabling amplification of RNA-containing substrates.
  • This capability broadens the applications of phi29 DNA polymerase-mediated RCA.
  • Potential applications include amplification of chimeric circular probes (padlock and molecular inversion probes).