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The High-Affinity Interaction Between ORC and DNA That Is Required for Replication Licensing Is Inhibited by 2-Arylquinolin-4-Amines

The High-Affinity Interaction Between ORC and DNA That Is Required for Replication Licensing Is Inhibited by 2-Arylquinolin-4-Amines

Nicola J Gardner, Peter J Gillespie, Jamie T Carrington, Emma J Shanks, Stuart P McElroy, Emma J Haagensen, Julie A Frearson, Andrew Woodland, J Julian Blow

Cell Chem Biol. 2017 Aug 17;24(8):981-992.e4.

PMID: 28781123

Abstract:

In late mitosis and G1, origins of DNA replication must be "licensed" for use in the upcoming S phase by being encircled by double hexamers of the minichromosome maintenance proteins MCM2-7. A "licensing checkpoint" delays cells in G1 until sufficient origins have been licensed, but this checkpoint is lost in cancer cells. Inhibition of licensing can therefore kill cancer cells while only delaying normal cells in G1. In a high-throughput cell-based screen for licensing inhibitors we identified a family of 2-arylquinolin-4-amines, the most potent of which we call RL5a. The binding of the origin recognition complex (ORC) to origin DNA is the first step of the licensing reaction. We show that RL5a prevents ORC forming a tight complex with DNA that is required for MCM2-7 loading. Formation of this ORC-DNA complex requires ATP, and we show that RL5a inhibits ORC allosterically to mimic a lack of ATP.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP133671666	RL5a		133671-66-6	Price

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