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. 1994 Aug 11;22(15):2970–2975. doi: 10.1093/nar/22.15.2970

Assembly of DNA polymerase delta and epsilon holoenzymes depends on the geometry of the DNA template.

L M Podust 1, V N Podust 1, C Floth 1, U Hübscher 1
PMCID: PMC310263  PMID: 7915029

Abstract

To study in details the assembly of DNA polymerases delta and epsilon holoenzymes a circular double-stranded DNA template containing a gap of 45 nucleotides was constructed. Both replication factor C and proliferating cell nuclear antigen were absolutely required and sufficient for assembly of DNA polymerase delta holoenzyme complex on DNA. On such a circular DNA substrate replication protein A (or E. coli single-strand DNA binding protein) was neither required for assembly of DNA polymerase delta holoenzyme complex nor for the gap-filling reaction. A circular structure of the DNA substrate was found to be absolutely critical for the ability of auxiliary proteins to interact with DNA polymerases. The linearization of the circular DNA template resulted in three dramatic effects: (i) DNA synthesis by DNA polymerase delta holoenzyme was abolished, (ii) the inhibition effect of replication factor C and proliferating cell nuclear antigen on DNA polymerase alpha was relieved and (iii) DNA polymerase epsilon could not form any longer a holoenzyme with replication factor C and proliferating cell nuclear antigen. The comparison of the effect of replication factor C and proliferating cell nuclear antigen on DNA polymerases alpha, delta and epsilon indicated that the auxiliary proteins appear to form a mobile clamp, which can easily slide along double-stranded DNA.

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