Expression of the catalytic subunit of human DNA polymerase δ in mammalian cells using a vaccinia virus vector system

P. Zhang, I. Frugulhetti, Y. Jiang, G. L. Holt, R. C. Condit, M. Y.W.T. Lee

Research output: Contribution to journalArticle

17 Scopus citations

Abstract

The catalytic polypeptide of human DNA polymerase δ was overexpressed in BSC-40 cells (African green monkey kidney cell line) using the vaccinia virus/pTM1 system. The recombinant human DNA polymerase δ was purified to homogeneity in two steps using an immunoaffinity column and a single-stranded DNA-cellulose column. Levels of expression were about 1% of soluble cytosolic protein. The recombinant catalytic subunit was fully active and exhibited enzymatic properties similar to that of the native two-subunit enzyme including the possession of an associated 3' to 5' exonuclease activity. Recombinant pol δ was stimulated by proliferating cell nuclear antigen (PCNA); however, the degree of stimulation was lower than that of the native human enzyme. Analysis of a double mutant of the catalytic subunit, H142R/F144S, showed that it had a greatly reduced sensitivity to PCNA, suggesting that the PCNA binding site of pol δ may be located in this region of the N terminus.

Original languageEnglish (US)
Pages (from-to)7993-7998
Number of pages6
JournalJournal of Biological Chemistry
Volume270
Issue number14
DOIs
StatePublished - 1995
Externally publishedYes

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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