Purification of a mitochondrial DNA polymerase from Crithidia fasciculata

A. F. Torri, P. T. Englund

Research output: Contribution to journalArticle

Abstract

The mitochondrial DNA polymerase from Crithidia fasciculata has been purified to near homogeneity. SDS-PAGE analysis of the purified enzyme reveals a single polypeptide with a molecular weight of approximately 43,000. The protein is basic, with an isoelectric point between 7.6-8.0. Its Stokes radius of 22 Å and its sedimentation coefficient of 4.1 S suggest a native molecular weight of 38,000, indicating that the protein is a monomer under our experimental conditions. Western blots and immunoprecipitations of crude extracts reveal a cross-reacting protein of 48 kDa, suggesting that the purified enzyme may be an enzymatically active proteolytic product. The mitochondrial origin of the polymerase was confirmed by cell fractionation. Our results indicate that the C. fasciculata enzyme may be among the smallest known mitochondrial polymerases.

Original languageEnglish (US)
Pages (from-to)4786-4792
Number of pages7
JournalJournal of Biological Chemistry
Volume267
Issue number7
StatePublished - Jan 1 1992

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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