DNA replication machinery: functional characterization of a complex containing DNA polymerase alpha, DNA polymerase delta, and replication factor C suggests an asymmetric DNA polymerase dimer.


By using a complementation assay for a replication factor C dependent ...
By using a complementation assay for a replication factor C dependent DNA polymerase activity on a singly-primed M13 DNA template, we have isolated from calf thymus a multiprotein complex active in DNA replication. For this, the inclusion of ATP during the entire isolation procedure was essential, since the complex decayed after omission of ATP. This complex contains at least DNA polymerase alpha/primase, DNA polymerase delta, and replication factor C as shown by gel-filtration and coimmunoprecipitation experiments. It is functionally active in replication of primed and unprimed single-stranded M13 DNA templates. Furthermore, in the presence of proliferating cell nuclear antigen and ATP, it forms an isolatable holoenzyme/template-primer complex. Replication factor C apparently mediates the interaction of DNA polymerase delta in the complex with proliferating cell nuclear antigen, through an ATP-dependent mechanism. This interaction appears to stabilize the binding of the complex to a template-primer and to coordinate the activity of DNA polymerase alpha/primase and DNA polymerase delta during replication of a single-stranded DNA template. Our data suggest the existence of an asymmetric DNA polymerase complex in mammalian cells.




new topics/pols set partial results complete validated


No results available for this paper.

Entry validated by:

Using Polbase tables:


Tables may be sorted by clicking on any of the column titles. A second click reverses the sort order. <Ctrl> + click on the column titles to sort by more than one column (e.g. family then name).


It is also possible to filter the table by typing into the search box above the table. This will instantly hide lines from the table that do not contain your search text.