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Nucleic Acids Research, Vol 27, Issue 17 3433-3437, Copyright © 1999 by Oxford University Press


ARTICLES

Electron microscopic analysis reveals that replication factor C is sequestered by single-stranded DNA

RC Keller, R Mossi, G Maga, RE Wellinger, U Hubscher and JM Sogo
Institute for Cell Biology, ETH-Honggerberg, CH-8049 Zurich, Switzerland.

Replication factor C (RF-C) is a eukaryotic heteropentameric protein required for DNA replication and repair processes by loading proliferating cell nuclear antigen (PCNA) onto DNA in an ATP-dependent manner. Prior to loading PCNA, RF-C binds to DNA. This binding is thought to be restricted to a specific DNA structure, namely to a primer/template junction. Using the electron microscope we have examined the affinity of human heteropentameric RF-C and the DNA- binding region within the large subunit of RF-C from Drosophila melanogaster (dRF-Cp140) to heteroduplex DNA. The electron microscopic data indicate that both human heteropentameric RF-C and the DNA-binding region within dRF-Cp140 are sequestered by single-stranded DNA. No preferential affinity for the 3' or 5' transition points from single- to double-stranded DNA was evident.
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