Replication Factor C from the Hyperthermophilic Archaeon Pyrococcus abyssi Does Not Need ATP Hydrolysis for Clamp-loading and Contains a Functionally Conserved RFC PCNA-binding Domain

The molecular organization of the replication complex in archaea is similar to that in eukaryotes. Only two proteins homologous to subunits of eukaryotic replication factor C (RFC) have been detected in Pyrococcus abyssi ( Pab). The genes encoding these two proteins are arranged in tandem. We cloned...

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Veröffentlicht in:Journal of molecular biology 2002-11, Vol.323 (5), p.795-810
Hauptverfasser: Henneke, Ghislaine, Gueguen, Yannick, Flament, Didier, Azam, Philippe, Querellou, Joël, Dietrich, Jacques, Hübscher, Ulrich, Raffin, Jean-Paul
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container_end_page 810
container_issue 5
container_start_page 795
container_title Journal of molecular biology
container_volume 323
creator Henneke, Ghislaine
Gueguen, Yannick
Flament, Didier
Azam, Philippe
Querellou, Joël
Dietrich, Jacques
Hübscher, Ulrich
Raffin, Jean-Paul
description The molecular organization of the replication complex in archaea is similar to that in eukaryotes. Only two proteins homologous to subunits of eukaryotic replication factor C (RFC) have been detected in Pyrococcus abyssi ( Pab). The genes encoding these two proteins are arranged in tandem. We cloned these two genes and co-expressed the corresponding recombinant proteins in Escherichia coli. Two inteins present in the gene encoding the small subunit ( PabRFC-small) were removed during cloning. The recombinant protein complex was purified by anion-exchange and hydroxyapatite chromatography. Also, the PabRFC-small subunit could be purified, while the large subunit ( PabRFC-large) alone was completely insoluble. The highly purified PabRFC complex possessed an ATPase activity, which was not enhanced by DNA. The Pab proliferating cell nuclear antigen (PCNA) activated the PabRFC complex in a DNA-dependent manner, but the PabRFC-small ATPase activity was neither DNA-dependent nor PCNA-dependent. The PabRFC complex was able to stimulate PabPCNA-dependent DNA synthesis by the Pabfamily D heterodimeric DNA polymerase. Finally, (i) the PabRFC-large fraction cross-reacted with anti-human-RFC PCNA-binding domain antibody, corroborating the conservation of the protein sequence, (ii) the human PCNA stimulated the PabRFC complex ATPase activity in a DNA-dependent way and (iii) the PabRFC complex could load human PCNA onto primed single-stranded circular DNA, suggesting that the PCNA-binding domain of RFC has been functionally conserved during evolution. In addition, ATP hydrolysis was not required either for DNA polymerase stimulation or PCNA-loading in vitro.
doi_str_mv 10.1016/S0022-2836(02)01028-8
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Only two proteins homologous to subunits of eukaryotic replication factor C (RFC) have been detected in Pyrococcus abyssi ( Pab). The genes encoding these two proteins are arranged in tandem. We cloned these two genes and co-expressed the corresponding recombinant proteins in Escherichia coli. Two inteins present in the gene encoding the small subunit ( PabRFC-small) were removed during cloning. The recombinant protein complex was purified by anion-exchange and hydroxyapatite chromatography. Also, the PabRFC-small subunit could be purified, while the large subunit ( PabRFC-large) alone was completely insoluble. The highly purified PabRFC complex possessed an ATPase activity, which was not enhanced by DNA. The Pab proliferating cell nuclear antigen (PCNA) activated the PabRFC complex in a DNA-dependent manner, but the PabRFC-small ATPase activity was neither DNA-dependent nor PCNA-dependent. 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subjects Adenosine Triphosphatases - metabolism
Adenosine Triphosphate - metabolism
Amino Acid Sequence
archaea
Base Sequence
Binding Sites
Conserved Sequence
Cross Reactions
DNA Polymerase II - metabolism
DNA Replication
DNA, Archaeal - genetics
DNA-Binding Proteins - chemistry
DNA-Binding Proteins - genetics
DNA-Binding Proteins - metabolism
Escherichia coli - genetics
Gene Expression
Genes, Archaeal
Humans
Hydrolysis
hyperthermophile
Macromolecular Substances
Molecular Sequence Data
PCNA-binding domain
Proliferating Cell Nuclear Antigen - metabolism
Protein Structure, Tertiary
Protein Subunits
Pyrococcus - genetics
Pyrococcus - metabolism
Pyrococcus abyssi
Recombinant Proteins - chemistry
Recombinant Proteins - genetics
Recombinant Proteins - metabolism
replication factor C
Replication Protein C
Sequence Homology, Amino Acid
title Replication Factor C from the Hyperthermophilic Archaeon Pyrococcus abyssi Does Not Need ATP Hydrolysis for Clamp-loading and Contains a Functionally Conserved RFC PCNA-binding Domain
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