Nucleic Acids Research, Vol 27, Issue 10 2108-2114, Copyright © 1999 by Oxford University Press
P Hughes, I Tratner, M Ducoux, K Piard and G Baldacci
Using proliferating cell nuclear antigen affinity chroma-tography and
glycerol gradient centrifugation of partially purified fractions from mouse
FM3A cells we have been able to isolate novel complexes of DNA polymerase
delta and DNA ligase 1 containing clearly defined subunit compositions. In
addition to the well known catalytic subunit of 125 kDa and accessory
subunit of 48 kDa, the DNA polymerase delta complex contained three
supplementary components, one of which reacted with antibodies directed
against the p40 and p37 subunits of RF-C. Of the two remaining components,
one termed p66 turned out to be coded by a gene whose putative C-terminal
domain displayed significant homology with that of the Cdc27 subunit of
Schizosaccharomyces pombe polymerase delta. On the basis of these and other
observations, we propose p66 to be the missing third subunit of mammalian
DNA polymerase delta. The DNA ligase 1 complex was made up of three novel
components in addition to the 125 kDa catalytic subunit, two of which, p48
and p66, were common to DNA polymerase delta. We discuss the implications
of our findings within the current framework of our understanding of DNA
replication.
ARTICLES
Isolation and identification of the third subunit of mammalian DNA polymerase delta by PCNA-affinity chromatography of mouse FM3A cell extracts
Centre National de la Recherche Scientifique (CNRS), UPR9044, Institut de Recherches sur le Cancer,7 rue Guy Moquet BP 8, 94801 Villejuif, France. hughes@infobiogen.fr
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