Overproduction and affinity purification of Saccharomyces cerevisiae replication factor C.

The Journal of Biological Chemistry
K J GerikP M Burgers

Abstract

Yeast replication factor C (RF-C) is a heteropentamer encoded by the RFC1-5 genes. RF-C activity in yeast extracts was overproduced about 80-fold after induction of a strain containing all five genes on a single plasmid, with expression of each gene placed under control of the galactose-inducible GAL1-10 promoter. This strongly indicates that overexpression of the five known RFC genes is sufficient for overproduction of RF-C. Overexpression of all five genes was also necessary to achieve overproduction of RF-C as omission of any single gene from the plasmid gave uninduced, i.e. normal cellular levels of RF-C. The interaction between RF-C and proliferating cell nuclear antigen (PCNA) was studied with PCNA-agarose beads. Binding of RF-C to PCNA-agarose beads is negligible in buffers containing 0.3 M NaCl. However, addition of Mg-ATP to the binding buffer caused strong binding of RF-C to the beads even at 0.8 M NaCl. Binding of ATP, but not its hydrolysis, was required for the strong binding mode as nonhydrolyzable analogs were also effective. The existence of two distinct binding modes between PCNA and RF-C was used as the key step in a greatly improved procedure for the purification of RF-C. RF-C from the overproduction strain p...Continue Reading

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