Biochemical Characterisation of the Clamp/clamp Loader Proteins from the Euryarchaeon Archaeoglobus Fulgidus

Overview

Journal Nucleic Acids Res

Publisher Oxford University Press

Specialty Biochemistry

Date 2002 Oct 18

PMID 12384579

Citations 17

Authors

Anja Seybert

David J Scott

Sarah Scaife

Martin R Singleton

Dale B Wigley

Affiliations

Soon will be listed here.

Abstract

Replicative polymerases of eukaryotes, prokaryotes and archaea obtain processivity using ring-shaped DNA sliding clamps that are loaded onto DNA by clamp loaders [replication factor C (RFC) in eukaryotes]. In this study, we cloned the two genes for the subunits of the RFC homologue of the euryarchaeon Archaeoglobus fulgidus. The proteins were expressed and purified from Escherichia coli both individually and as a complex. The afRFC subunits form a heteropentameric complex consisting of one copy of the large subunit and four copies of the small subunits. To analyse the functionality of afRFC, we also expressed the A.fulgidus PCNA homologue and a type B polymerase (PolB1) in E.coli. In primer extension assays, afRFC stimulated the processivity of afPolB1 in afPCNA-dependent reactions. Although the afRFC complex showed significant DNA-dependent ATPase activity, which could be further stimulated by afPCNA, neither of the isolated afRFC subunits showed this activity. However, both the large and small afRFC subunits showed interaction with afPCNA. Furthermore, we demonstrate that ATP binding, but not hydrolysis, is needed to stimulate interactions of the afRFC complex with afPCNA and DNA.

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