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Related Experiment Videos

Dye structure affects Taq DNA polymerase terminator selectivity.

J W Brandis1

  • 1DNA Chemistry Group, Genetic Analysis Business Unit, PE Biosystems, 850 Lincoln Center Drive, Foster City, CA 94404, USA. brandjw@perkin-elmer.com

Nucleic Acids Research
|April 2, 1999
PubMed
Summary
This summary is machine-generated.

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Dye-labeled terminators impact DNA sequencing enzyme selectivity. Fluorescein dyes attached to pyrimidines hinder polymerase function, unlike those on purines, suggesting improved terminator design for DNA sequencing.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Genetics

Background:

  • Taq DNA polymerase variants enhance DNA sequencing.
  • Terminator chemistry in sequencing shows variable peak heights, suggesting dye interference.

Purpose of the Study:

  • Investigate how dye-labeled terminators interact with Taq polymerase.
  • Quantify dye-enzyme interactions to improve DNA sequencing methods.

Main Methods:

  • Measured nucleotide binding and polymerization rates for labeled terminators.
  • Developed a gel-based assay to screen dye-enzyme interactions.

Main Results:

  • 6-TAMRA-ddTTP showed no significant difference from unlabeled ddTTP.
  • 6-FAM-ddTTP exhibited a 40-fold lower polymerization rate without affecting binding.

Related Experiment Videos

  • Fluorescein dyes on pyrimidines interfered with polymerase conformational changes, but not on purines.

    • Conclusions:

    • Dye structure and attachment site (pyrimidine vs. purine) critically affect enzyme selectivity.
    • Optimizing dye-linker combinations may enable improved fluorescein terminators for DNA sequencing.