Replication factor C, a clamp-loading complex involved in installing PCNA on suitable DNA structures.
ATP-dependent clamp loading places the ring around a suitable primer-template junction. The clamp then supports a polymerase or associated factor, so loading the clamp and extending the DNA chain are different enzymatic operations. [ref]
Molecular Biology of the Cell, 4th edition by Bruce Alberts and others. Chapter 5, DNA Replication Mechanisms
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