DNA polymerase gamma from Xenopus laevis. I. The identification of a high molecular weight catalytic subunit by a novel DNA polymerase photolabeling procedure

J Biol Chem. 1989 Dec 25;264(36):21491-7.

Abstract

DNA polymerase gamma has been purified over 10,000-fold from mitochondria of Xenopus laevis ovaries. We have developed a novel technique which specifically photolabels DNA polymerases. This procedure, the DNA polymerase trap, was used to identify a catalytic subunit of 140,000 Da from X. laevis DNA polymerase gamma. Additional catalytically active polypeptides of 100,000 and 55,000 Da were identified in the highly purified enzyme. These appear to be products of degradation of the 140,000-Da subunit. The DNA polymerase trap, which does not require large amounts of enzyme or renaturation from sodium dodecyl sulfate, is an alternative to the classic "activity gel."

Publication types

  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Animals
  • Base Sequence
  • Centrifugation, Density Gradient
  • Chromatography, Affinity
  • Chromatography, Gel
  • Chromatography, Ion Exchange
  • DNA Polymerase III / isolation & purification*
  • DNA Polymerase III / metabolism
  • DNA-Directed DNA Polymerase / isolation & purification*
  • DNA-Directed DNA Polymerase / metabolism
  • Electrophoresis, Polyacrylamide Gel
  • Female
  • Macromolecular Substances
  • Molecular Sequence Data
  • Molecular Weight
  • Oligodeoxyribonucleotides
  • Oocytes / enzymology*
  • Protein Conformation
  • Ultraviolet Rays
  • Xenopus laevis

Substances

  • Macromolecular Substances
  • Oligodeoxyribonucleotides
  • DNA Polymerase III
  • DNA-Directed DNA Polymerase